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            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; climate reconstructions|tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; climate reconstructions|tree ring</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; reconstructions &gt; precipitation</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree-ring &gt; oxygen isotopes</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>earth science &gt; paleoclimate &gt; tree-ring &gt; carbon isotopes</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName xlink:title="GCMD Science Keywords">
            <gmd:CI_Citation uuid="227737d0-428b-11df-9879-0800200c9a66">
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Science Keywords</gco:CharacterString>
              </gmd:title>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2025</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>22</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty xlink:title="GCMD Landing Page">
                <gmd:CI_ResponsibleParty uuid="1edb41d0-428a-11df-9879-0800200c9a66">
                  <gmd:organisationName>
                    <gco:CharacterString>Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:contactInfo>
                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords</gmd:URL>
                          </gmd:linkage>
                          <gmd:name>
                            <gco:CharacterString>GCMD Keyword Forum Page</gco:CharacterString>
                          </gmd:name>
                          <gmd:description>
                            <gco:CharacterString>Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords</gco:CharacterString>
                          </gmd:description>
                          <gmd:function>
                            <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
                          </gmd:function>
                        </gmd:CI_OnlineResource>
                      </gmd:onlineResource>
                    </gmd:CI_Contact>
                  </gmd:contactInfo>
                  <gmd:role>
                    <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian">custodian</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
              </gmd:citedResponsibleParty>
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>Palmer Drought Index Reconstruction</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName gco:nilReason="missing" />
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: Palmer Drought Severity Index; Material: delta 13C|delta 18O</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: Palmer Drought Severity Index; Material: delta 13C|delta 18O</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: age; Material: null</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: Palmer Drought Severity Index; Material: delta 13C|delta 18O</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: age; Material: null</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: Palmer Drought Severity Index; Material: delta 13C|delta 18O</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: Palmer Drought Severity Index; Material: delta 13C|delta 18O</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 18O; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>What: delta 13C; Material: cellulose</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
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ABSTRACT SUPPLIED BY ORIGINATOR: Europe's recent summer droughts have had devastating ecological and economic consequences, but the severity and cause of these extremes remain unclear. Here we present 27,080 annually resolved and absolutely dated measurements of tree-ring stable carbon and oxygen (d13C and d18O) isotopes from 21 living and 126 relict oaks (Quercus spp.) used to reconstruct central European summer hydroclimate from 75 bce to 2018 ce. We find that the combined inverse d13C and d18O values correlate with the June-August Palmer Drought Severity Index from 1901-2018 at 0.73 (P&lt;0.001). Pluvials around 200, 720 and 1100 ce, and droughts around 40, 590, 950 and 1510 ce and in the twenty-first century, are superimposed on a multi-millennial drying trend. Our reconstruction demonstrates that the sequence of recent European summer droughts since 2015 ce is unprecedented in the past 2,110 years. This hydroclimatic anomaly is probably caused by anthropogenic warming and associated changes in the position of the summer jet stream.</gco:CharacterString>
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                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Landing Page</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>Metadata Landing Page</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>NCEI landing page with general information and links to access the data.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/access/paleo-search/study/32292</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Web Browser</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NOAA Study Page</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Study page with data access information.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="search">search</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/products/paleoclimatology/climate-reconstruction</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Information</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NCEI Climate Reconstruction Page</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>General information for this data type.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/treering/reconstructions/europe/buntgen2021scpdsi-noaa.txt</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Direct download links for dataset files.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/treering/reconstructions/europe/buntgen2021d18o-noaa.txt</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Direct download links for dataset files.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/treering/reconstructions/europe/buntgen2021d13c-noaa.txt</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Direct download links for dataset files.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
          </gmd:distributorTransferOptions>
        </gmd:MD_Distributor>
      </gmd:distributor>
    </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
      </gmd:maintenanceAndUpdateFrequency>
      <gmd:maintenanceNote>
        <gco:CharacterString>This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21</gco:CharacterString>
      </gmd:maintenanceNote>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmi:MI_Metadata>