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          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/291" xlink:actuate="onRequest">NOAA Geophysical Fluid Dynamics Laboratory</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/976" xlink:actuate="onRequest">NOAA Pacific Marine Environmental Laboratory</gmx:Anchor>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataCentre">dataCentre</gmd:MD_KeywordTypeCode>
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            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>NODC COLLECTING INSTITUTION NAMES THESAURUS</gco:CharacterString>
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        </gmd:MD_Keywords>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
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            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1806" xlink:actuate="onRequest">Princeton University</gmx:Anchor>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataCentre">dataCentre</gmd:MD_KeywordTypeCode>
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            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>NODC SUBMITTING INSTITUTION NAMES THESAURUS</gco:CharacterString>
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          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/project/details/727" xlink:actuate="onRequest">Ocean Carbon and Acidification Data System (OCADS)</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/project/details/675" xlink:actuate="onRequest">US DOC; NOAA; Office of Oceanic and Atmospheric Research; Ocean Acidification Program (OAP)</gmx:Anchor>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="project">project</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>NODC PROJECT NAMES THESAURUS</gco:CharacterString>
              </gmd:title>
              <gmd:date gco:nilReason="inapplicable" />
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        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/179" xlink:actuate="onRequest">World-Wide Distribution</gmx:Anchor>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="place">place</gmd:MD_KeywordTypeCode>
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          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>NODC SEA AREA NAMES THESAURUS</gco:CharacterString>
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          </gmd:thesaurusName>
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      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
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          <gmd:keyword>
            <gco:CharacterString>oceanography</gco:CharacterString>
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          <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>
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          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>WMO_CategoryCode</gco:CharacterString>
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                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2012-09-15</gco:Date>
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                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
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                </gmd:CI_Date>
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      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/025f20d7-620f-437b-a02a-e2b5aa674507" xlink:actuate="onRequest">DOC/NOAA/GFDL &gt; NOAA Geophysical Fluid Dynamics Laboratory, U.S. Department of Commerce</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/274cc3ed-e075-4fb3-89cd-51fa72bc64f9" xlink:actuate="onRequest">DOC/NOAA/OAR/AOML &gt; Atlantic Oceanographic and Meteorological Laboratory, OAR, NOAA, U.S. Department of Commerce</gmx:Anchor>
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            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/8b9573fe-8097-41b7-9c0a-38627e8d7810" xlink:actuate="onRequest">DOC/NOAA/OAR/PMEL &gt; Pacific Marine Environmental Laboratory, OAR, NOAA, U.S. Department of Commerce</gmx:Anchor>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataCentre">dataCentre</gmd:MD_KeywordTypeCode>
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          <gmd:thesaurusName>
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              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Data Center Keywords</gco:CharacterString>
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                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2026</gco:Date>
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                  <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>
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                <gco:CharacterString>23</gco:CharacterString>
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                    <gmd:CI_Contact>
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                            <gco:CharacterString>Greenbelt</gco:CharacterString>
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                            <gco:CharacterString>MD</gco:CharacterString>
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                      </gmd:address>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords</gmd:URL>
                          </gmd:linkage>
                          <gmd:protocol>
                            <gco:CharacterString>HTTPS</gco:CharacterString>
                          </gmd:protocol>
                          <gmd:name>
                            <gco:CharacterString>GCMD Keyword Forum Page</gco:CharacterString>
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                            <gco:CharacterString>Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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>
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                          <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>
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                        </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>
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          </gmd:thesaurusName>
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        <gmd:MD_Keywords>
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            <gco:CharacterString>Ocean Acidification Program (OAP)</gco:CharacterString>
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          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="project">project</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Ocean Acidification Search Keywords</gco:CharacterString>
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          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/26afa886-4866-4536-be3a-6f9db9aacd97" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN CHEMISTRY &gt; CARBON DIOXIDE</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/68f7ba1b-a2f9-41b6-9bc1-fd187942fbed" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN CHEMISTRY &gt; CARBONATE</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/90aa8838-79bd-4b28-b518-8217e863c385" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN CHEMISTRY &gt; OXYGEN</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/4433600b-f323-458a-b295-352f939aab6b" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN CHEMISTRY &gt; PH</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/bd24a9a9-7d52-4c29-b2a0-6cefd216ae78" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN TEMPERATURE &gt; SEA SURFACE TEMPERATURE</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/7e95b5fc-1d58-431a-af36-948b29fa870d" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; SALINITY/DENSITY &gt; SALINITY</gmx:Anchor>
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          <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>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Science Keywords</gco:CharacterString>
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                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2026</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>
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                </gmd:CI_Date>
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              <gmd:edition>
                <gco:CharacterString>23</gco:CharacterString>
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                      <gmd:address>
                        <gmd:CI_Address>
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                            <gco:CharacterString>Greenbelt</gco:CharacterString>
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                            <gco:CharacterString>MD</gco:CharacterString>
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                      </gmd:address>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords</gmd:URL>
                          </gmd:linkage>
                          <gmd:protocol>
                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                            <gco:CharacterString>GCMD Keyword Forum Page</gco:CharacterString>
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                          <gmd:function>
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                    </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>
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      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>Model output</gco:CharacterString>
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          <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>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>OCADS Study Type</gco:CharacterString>
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              <gmd:date gco:nilReason="inapplicable" />
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            <gco:CharacterString>chlos</gco:CharacterString>
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          <gmd:keyword>
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          <gmd:keyword>
            <gco:CharacterString>co3satarag</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>dpco2</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>o2os</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>o2satos</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>phos</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>sos</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>spco2</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>tos</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>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Provider Variable Abbreviations</gco:CharacterString>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/7f7bb2bd-89a6-418e-b291-8fb5af7dcf4f" xlink:actuate="onRequest">GAS SENSORS &gt; GAS SENSORS</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/fdcfecd6-9731-450e-94e8-5bc4c04e22a2" xlink:actuate="onRequest">OXYGEN METERS &gt; OXYGEN METERS</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/5c38595e-5e7d-4513-9f0e-aa9b5f6b139f" xlink:actuate="onRequest">PH METERS &gt; PH METERS</gmx:Anchor>
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          <gmd:keyword>
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          <gmd:keyword>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="instrument">instrument</gmd:MD_KeywordTypeCode>
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            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Instrument Keywords</gco:CharacterString>
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                  <gmd:date>
                    <gco:Date>2026</gco:Date>
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            <gmx:Anchor xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:actuate="onRequest" xlink:title="CC-BY-4.0">This dataset is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License.</gmx:Anchor>
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                    <gmd:URL>ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0227/0292657/</gmd:URL>
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                    <gco:CharacterString>These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).</gco:CharacterString>
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                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0292657/2.2</gmd:URL>
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Abbreviation: tos;
Unit: degrees Celsius;
Observation type: daily average model output</gco:CharacterString>
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Unit: Pa;
Observation type: daily average model output</gco:CharacterString>
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Unit: kg m-3;
Observation type: daily average model output</gco:CharacterString>
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Abbreviation: phos;
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Abbreviation: co3;
Unit: mol m-3;
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Unit: mol m-3;
Observation type: daily average model output</gco:CharacterString>
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[https://www.aoml.noaa.gov/phod/tsg/about.php 2021-01-29]</gco:CharacterString>
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