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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>
                  </gmd:function>
                </gmd:CI_OnlineResource>
              </gmd:onLine>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/download/208682</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>HTTPS</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Navigate directly to the URL for data access and direct download.</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:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0152/0208682/</gmd:URL>
                  </gmd:linkage>
                  <gmd:protocol>
                    <gco:CharacterString>FTP</gco:CharacterString>
                  </gmd:protocol>
                  <gmd:applicationProfile>
                    <gco:CharacterString>Any FTP client</gco:CharacterString>
                  </gmd:applicationProfile>
                  <gmd:name>
                    <gco:CharacterString>FTP</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <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>
                  </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>
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    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
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                <gco:CharacterString>NCEI Accession 0208682 v1.1 was published.</gco:CharacterString>
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              <gmd:dateTime>
                <gco:DateTime>2020-01-31T20:42:22Z</gco:DateTime>
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                        <gco:CharacterString>NCEI Accession 0208682 v1.1</gco:CharacterString>
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                      <gmd:date>
                        <gmd:CI_Date>
                          <gmd:date gco:nilReason="inapplicable" />
                          <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>
                          </gmd:dateType>
                        </gmd:CI_Date>
                      </gmd:date>
                      <gmd:citedResponsibleParty>
                        <gmd:CI_ResponsibleParty>
                          <gmd:individualName gco:nilReason="inapplicable" />
                          <gmd:contactInfo>
                            <gmd:CI_Contact>
                              <gmd:onlineResource>
                                <gmd:CI_OnlineResource>
                                  <gmd:linkage>
                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0208682/1.1</gmd:URL>
                                  </gmd:linkage>
                                  <gmd:protocol>
                                    <gco:CharacterString>HTTPS</gco:CharacterString>
                                  </gmd:protocol>
                                  <gmd:name>
                                    <gco:CharacterString>NCEI Accession 0208682 v1.1</gco:CharacterString>
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                                  <gmd:description>
                                    <gco:CharacterString>published 2020-01-31T20:42:22Z</gco:CharacterString>
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                                  </gmd:function>
                                </gmd:CI_OnlineResource>
                              </gmd:onlineResource>
                            </gmd:CI_Contact>
                          </gmd:contactInfo>
                          <gmd:role gco:nilReason="inapplicable" />
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                      </gmd:citedResponsibleParty>
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  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
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        </gmd:DQ_Scope>
      </gmd:scope>
      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Dissolved Inorganic Carbon;
Abbreviation: DIC;
Unit: UMOL_KG;
Observation type: Surface Discrete;
Analyzing instrument: DIC analyzer (AS-C3, Apollo SciTech, U.S.A.);
Uncertainty: 2 umol kg-1;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Total Alkalinity (calculated values);
Abbreviation: TA;
Unit: UMOL_KG;
Observation type: Calculated;
Detailed sampling and analyzing information: calculated from temperature, salinity, pH@25 and DIC using the CO2SYS program [Lewis and Wallace, 1998] with the dissociation constants (K1 and K2) for carbonic acid of Mehrbach et al.[1973] as refitted by Dickson and Millero [1987] and the CO2 solubility constant (K0) of Weiss (1974);
Uncertainty: 3 umol kg-1;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
              </gmd:description>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: pH on NBS scale at 25 Deg. C;
Abbreviation: PH_NBS_MEA;
Observation type: surface discrete;
Uncertainty: 0.01;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
              </gmd:description>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Partial pressure of carbon dioxide (calculated);
Abbreviation: PCO2_INSITU_UATM;
Unit: uatm;
Observation type: calculated;
Detailed sampling and analyzing information: calculated from temperature, salinity, pH@25 and DIC using the CO2SYS program [Lewis and Wallace, 1998] with the dissociation constants (K1 and K2) for carbonic acid of Mehrbach et al.[1973] as refitted by Dickson and Millero [1987] and the CO2 solubility constant (K0) of Weiss (1974);
Uncertainty: 4 uatm;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTD temperature;
Abbreviation: CTDTMP_ITS90_DEG_C;
Unit: Deg. C;
Observation type: surface CTD;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTD salinity;
Abbreviation: CTDSAL_PSS78;
Observation type: surface CTD;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
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            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Dissolved Oxygen;
Abbreviation: OXYGEN_UMOL_KG;
Unit: UMOL/KG;
Observation type: surface discrete;
Researcher name: Liang Xue;
Researcher institution: First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China</gco:CharacterString>
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    <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>Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.</gco:CharacterString>
      </gmd:maintenanceNote>
      <gmd:contact>
        <gmd:CI_ResponsibleParty>
          <gmd:organisationName>
            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
          </gmd:organisationName>
          <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>
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    <gmi:MI_AcquisitionInformation id="AMS">
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be58">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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          <gmi:type>
            <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>measures gaseous carbon dioxide

Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption.

Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water.

To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water.</gco:CharacterString>
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      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bee7">
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            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>CTD</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
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          <gmi:type>
            <gco:CharacterString>CTD</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>Conductivity-Temperature-Depth probe</gco:CharacterString>
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        </gmi:MI_Instrument>
      </gmi:instrument>
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        <gmi:MI_Platform id="plat_ba52">
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              <gmd:code>
                <gco:CharacterString>UNKNOWN PLATFORMS OF SOUTH KOREA</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>UNKNOWN PLATFORMS OF SOUTH KOREA</gco:CharacterString>
          </gmi:description>
          <gmi:instrument gco:nilReason="missing" />
        </gmi:MI_Platform>
      </gmi:platform>
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