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              </gmd:address>
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                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/</gmd:URL>
                  </gmd:linkage>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/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://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
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        </gmd:CI_ResponsibleParty>
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      <gmd:resourceMaintenance>
        <gmd:MD_MaintenanceInformation>
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            <gmd:MD_MaintenanceFrequencyCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
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            <gmd:MD_ProgressCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed">completed</gmd:MD_ProgressCode>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/04fa9023-ab68-4dd0-a82e-abe685105a53" xlink:actuate="onRequest">EARTH SCIENCE &gt; Oceans &gt; Sea Ice &gt; Salinity</gmx:Anchor>
          </gmd:keyword>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/860e2af9-ce29-4f3f-b027-ae3747eb3e01" xlink:actuate="onRequest">EARTH SCIENCE &gt; Cryosphere &gt; Sea Ice</gmx:Anchor>
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            <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
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          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gmx:Anchor xlink:href="https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords" xlink:actuate="onRequest">Global Change Master Directory (GCMD) Science Keywords</gmx:Anchor>
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                  <gmd:date>
                    <gco:Date>2026-01-27</gco:Date>
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                    <gmx:Anchor xlink:href="https://ror.org/027ka1x80" xlink:actuate="onRequest" xlink:title="ror">Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA)</gmx:Anchor>
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                            <gco:CharacterString>Greenbelt</gco:CharacterString>
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                            <gco:CharacterString>MD</gco:CharacterString>
                          </gmd:administrativeArea>
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                            <gco:CharacterString>United States of America</gco:CharacterString>
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                          <gmd:electronicMailAddress gco:nilReason="unknown" />
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                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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                          <gmd:name>
                            <gco:CharacterString>Global Change Master Directory (GCMD) Keywords</gco:CharacterString>
                          </gmd:name>
                          <gmd:description>
                            <gco:CharacterString>The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.</gco:CharacterString>
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                          <gmd:function>
                            <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
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                    <gmd:CI_RoleCode codeList="https://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_RoleCode" codeListValue="publisher">publisher</gmd:CI_RoleCode>
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            <gco:CharacterString>Antarctica</gco:CharacterString>
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            <gco:CharacterString>chemical fractionation</gco:CharacterString>
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            <gco:CharacterString>sea ice</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>sea salt aerosol</gco:CharacterString>
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            <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
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      <gmd:descriptiveKeywords>
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          <gmd:keyword>
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          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="place">place</gmd:MD_KeywordTypeCode>
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        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gmx:Anchor xlink:href="https://inspire.ec.europa.eu/theme/of" xlink:actuate="onRequest">Oceanographic geographical features</gmx:Anchor>
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            <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
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      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
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                <gmx:Anchor xlink:href="https://ror.org/01rhff309" xlink:actuate="onRequest" xlink:title="ror">NERC EDS UK Polar Data Centre</gmx:Anchor>
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Two consecutive Antarctic expeditions were carried out in the Weddell Sea aboard the German icebreaker RV Polarstern in 2013, the Antarctic Winter Ecosystem ClimateStudy(AWECS), ANT-XXIX/6 between 8 June and 12 August, and the spring expedition ANT-XXIX/7 between 14 August and 16 October. Methods are described in detail in Frey et al., 2019.
Data quality: 
Detection limits and data quality are described in detail in Frey et al., 2019.</gco:CharacterString>
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      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
      </gmd:maintenanceAndUpdateFrequency>
      <gmd:maintenanceNote>
        <gmd:MD_ProgressCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed">completed</gmd:MD_ProgressCode>
      </gmd:maintenanceNote>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmd:MD_Metadata>

