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ABSTRACT SUPPLIED BY ORIGINATOR: This report describes details of developing a volcano forcing reconstruction (Crowley et al., 2008) for climate models that is based primarily on sulphate records in Antarctic and Greenland ice cores. The chronology of eruptions is considered accurate to within 1 yr for the interval AD 1104-2000 and about 2 yr for AD 800-1103. The reconstruction involves (1) calibration against satellite aerosol optical depth (AOD) estimates of the 1991 Pinatubo/Hudson eruptions; (2) partial validation against independent lunar estimates of AOD and global sulphate emissions; (3) partial assessment of uncertainties in AOD estimates; (4) assessment of possible tropical "false positives" in ice core reconstructions due to simultaneous occurrence of mid/high-latitude eruptions in each hemisphere; (5) identification of a new category of eruptions, termed "unipolar" tropical eruptions, in which the eruption plume penetrates mainly to polar regions in only the hemisphere of its eruption; (6) use of different growth curves for high- and low-latitude eruptions; (7) specification of 2/3 power shortwave scaling for eruptions larger than the 1991 Pinatubo eruption; (8) introduction of an estimate of effective particle size that affects lifetime and scattering properties of stratospheric aerosols; and (9) utilization of bimonthly-resolution electrical conductivity measurements to estimate the eruption date of the 1258/1259 eruption as 1257.7 +/- 0.2. The data, and a high-temporal resolution reconstruction for climate models, are available at: https://www.ncdc.noaa.gov/cdo/f?p=519:1:::::P1_STUDY_ID:14168.</gco:CharacterString>
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                <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="distributor">distributor</gmd:CI_RoleCode>
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            </gmd:CI_ResponsibleParty>
          </gmd:distributorContact>
          <gmd:distributionOrderProcess>
            <gmd:MD_StandardOrderProcess>
              <gmd:fees>
                <gco:CharacterString>In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.</gco:CharacterString>
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              <gmd:orderingInstructions>
                <gco:CharacterString>Contact NCEI for other distribution options and instructions.</gco:CharacterString>
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            </gmd:MD_StandardOrderProcess>
          </gmd:distributionOrderProcess>
          <gmd:distributorFormat>
            <gmd:MD_Format>
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                <gco:CharacterString>Native Format(s)</gco:CharacterString>
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              <gmd:version gco:nilReason="missing" />
            </gmd:MD_Format>
          </gmd:distributorFormat>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://doi.org/10.25921/zztg-6f51</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <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>
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                  <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>
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                </gmd:CI_OnlineResource>
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          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/access/paleo-search/study/14168</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>
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                </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-forcing</gmd:URL>
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                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Information</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>NCEI Forcing 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>
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                </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/climate_forcing/volcanic_aerosols/crowley2013/ici5_aod_reff_c.zip</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>
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                  <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>
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                </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/climate_forcing/volcanic_aerosols/crowley2013/crowley2013so4-sh.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/climate_forcing/volcanic_aerosols/crowley2013/crowley2013so4-nh.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/climate_forcing/volcanic_aerosols/crowley2013/crowley2013pmip.txt</gmd:URL>
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                  <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/climate_forcing/volcanic_aerosols/crowley2013/crowley2013aod-reff.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/climate_forcing/volcanic_aerosols/crowley2013/ICI5_3090S_REFF_c.txt</gmd:URL>
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                  <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>
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                </gmd:CI_OnlineResource>
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          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/volcanic_aerosols/crowley2013/ICI5_3090S_AOD_c.txt</gmd:URL>
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                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
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                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
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                  <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>
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                </gmd:CI_OnlineResource>
              </gmd:onLine>
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          </gmd:distributorTransferOptions>
          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/volcanic_aerosols/crowley2013/ICI5_3090N_REFF_c.txt</gmd:URL>
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                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                  <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>
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                </gmd:CI_OnlineResource>
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          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/volcanic_aerosols/crowley2013/ICI5_3090N_AOD_c.txt</gmd:URL>
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                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
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                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
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                  <gmd:description>
                    <gco:CharacterString>Direct download links for dataset files.</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="download">download</gmd:CI_OnLineFunctionCode>
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            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
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                  <gmd:protocol>
                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                  <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>
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            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
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                  <gmd:protocol>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
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                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Direct download links for dataset files.</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="download">download</gmd:CI_OnLineFunctionCode>
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            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
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                  <gmd:protocol>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Download</gco:CharacterString>
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                  <gmd:name>
                    <gco:CharacterString>NCEI Direct Download</gco:CharacterString>
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                  <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>
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            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
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                  <gmd:protocol>
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                  <gmd:applicationProfile>
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                  <gmd:name>
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                  </gmd:name>
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                    <gco:CharacterString>Direct download links for dataset files.</gco:CharacterString>
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</gmi:MI_Metadata>