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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/43" xlink:actuate="onRequest">thermosalinograph</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/obstype/details/12" xlink:actuate="onRequest">meteorological</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/obstype/details/14" xlink:actuate="onRequest">physical</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/obstype/details/27" xlink:actuate="onRequest">surface underway</gmx:Anchor>
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            <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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                <gco:CharacterString>NODC COLLECTING INSTITUTION NAMES THESAURUS</gco:CharacterString>
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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/179" xlink:actuate="onRequest">Carbon Dioxide Information Analysis Center</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="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:descriptiveKeywords>
        <gmd:MD_Keywords>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/72" xlink:actuate="onRequest">Indian Ocean</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/107" xlink:actuate="onRequest">South Pacific Ocean</gmx:Anchor>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/112" xlink:actuate="onRequest">Tasman Sea</gmx:Anchor>
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            <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: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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                <gco:CharacterString>WMO_CategoryCode</gco:CharacterString>
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      <gmd:descriptiveKeywords>
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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="dataCentre">dataCentre</gmd:MD_KeywordTypeCode>
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                    <gco:Date>2026</gco:Date>
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              <gmd:title>
                <gco:CharacterString>Ocean Acidification Search Keywords</gco:CharacterString>
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            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/a65cfcfa-1028-4cc8-a4d5-9e78f487a612" xlink:actuate="onRequest">EARTH SCIENCE &gt; ATMOSPHERE &gt; ATMOSPHERIC CHEMISTRY &gt; CARBON AND HYDROCARBON COMPOUNDS &gt; ATMOSPHERIC CARBON DIOXIDE &gt; PARTIAL PRESSURE OF CARBON DIOXIDE</gmx:Anchor>
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            <gco:CharacterString>Surface underway</gco:CharacterString>
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            <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:CI_Citation>
              <gmd:title>
                <gco:CharacterString>OCADS Study Type</gco:CharacterString>
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            <gco:CharacterString>FCO2_WAT</gco:CharacterString>
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            <gco:CharacterString>PCO2_WAT</gco:CharacterString>
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            <gco:CharacterString>SSS</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>SST</gco:CharacterString>
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            <gco:CharacterString>XCO2_AIR</gco:CharacterString>
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                <gmd:CI_ResponsibleParty>
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                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                            <gco:CharacterString>https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/VOS_Program/</gco:CharacterString>
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                            <gco:CharacterString>Related resource</gco:CharacterString>
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                        <gmd:CI_OnlineResource>
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              <gmd:citedResponsibleParty>
                <gmd:CI_ResponsibleParty>
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                <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
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            </gmd:CI_ResponsibleParty>
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                <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_DigitalTransferOptions>
              <gmd:transferSize>
                <gco:Real>2.652</gco:Real>
              </gmd:transferSize>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0115153.html</gmd:URL>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Web browser</gco:CharacterString>
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                    <gco:CharacterString>Project Metadata</gco:CharacterString>
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                  <gmd:description>
                    <gco:CharacterString>Navigate directly to the URL for a descriptive web page with download links.</gco:CharacterString>
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                <gmd:CI_OnlineResource>
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                  <gmd:applicationProfile>
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                  <gmd:description>
                    <gco:CharacterString>Navigate directly to the URL for a descriptive web page with download links.</gco:CharacterString>
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                  <gmd:applicationProfile>
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                  <gmd:description>
                    <gco:CharacterString>Navigate directly to the URL for a descriptive web page with download links.</gco:CharacterString>
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                <gco:CharacterString>NCEI accession 0081031 was superseded by this accession.</gco:CharacterString>
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                <gco:CharacterString>NCEI accession 0081031 has been superseded by this accession. Please use and refer to this accession instead of NCEI accession 0081031.</gco:CharacterString>
              </gmd:rationale>
              <gmd:dateTime>
                <gco:DateTime>2019-04-10T12:44:17Z</gco:DateTime>
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                        <gco:CharacterString>NCEI Accession 0081031</gco:CharacterString>
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                        <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>
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                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0081031</gmd:URL>
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                                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                                    <gco:CharacterString>NCEI Accession 0081031</gco:CharacterString>
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                                    <gco:CharacterString>published 2019-04-10T12:44:17Z</gco:CharacterString>
                                  </gmd:description>
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                                    <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>
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    <gmd:DQ_DataQuality>
      <gmd:scope>
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      <gmd:lineage>
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            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: SST;
Abbreviation: SST;
Unit: DEG_C;
Controlled vocabulary name: SEA SURFACE TEMPERATURE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: SSS;
Controlled vocabulary name: SALINITY;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: ATM_PRE;
Unit: DBAR;
Controlled vocabulary name: BAROMETRIC PRESSURE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: XCO2_AIR;
Abbreviation: XCO2_AIR;
Unit: PPM;
Controlled vocabulary name: Partial pressure (or fugacity) of carbon dioxide - atmosphere;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: XCO2_WAT;
Abbreviation: XCO2_WAT;
Unit: PPM;
Controlled vocabulary name: partial pressure of carbon dioxide - water;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: PCO2_WAT;
Abbreviation: PCO2_WAT;
Unit: UATM;
Controlled vocabulary name: partial pressure of carbon dioxide - water;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: DEL_PCO2;
Abbreviation: DEL_PCO2;
Unit: UATM;
Controlled vocabulary name: AIR-SEA DIFFERENCE - PARTIAL PRESSURE (OR FUGACITY) OF CARBON DIOXIDE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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              <gmd:description>
                <gco:CharacterString>Parameter or Variable: FCO2_WAT;
Abbreviation: FCO2_WAT;
Unit: UATM;
Controlled vocabulary name: partial pressure of carbon dioxide - water;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: DEL_FCO2;
Abbreviation: DEL_FCO2;
Unit: UATM;
Controlled vocabulary name: AIR-SEA DIFFERENCE - PARTIAL PRESSURE (OR FUGACITY) OF CARBON DIOXIDE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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            <gmd:MD_ScopeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="repository">repository</gmd:MD_ScopeCode>
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                <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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                <gco:CharacterString>NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.</gco:CharacterString>
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                <gco:DateTime>2015-04-22T00:00:00</gco:DateTime>
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      <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>
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        <gco:CharacterString>Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.</gco:CharacterString>
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            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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                <gco:CharacterString>barometric pressure sensor</gco:CharacterString>
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            <gco:CharacterString>barometric pressure sensor</gco:CharacterString>
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            <gco:CharacterString>instrument used to measure the atmospheric pressure.</gco:CharacterString>
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      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be58">
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                <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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                <gco:CharacterString>showerhead equilibrator</gco:CharacterString>
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          <gmi:type>
            <gco:CharacterString>showerhead equilibrator</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>extracts dissolved CO2 from water

A carbon dioxide equilibrator is usually in the shape of a vertical tube, with a showerhead on the top, some headspace, a lot of beads to increase the surface exchange area between water and air, a water seal device at the bottom to allow water to overflow, but prevents air exchange between inside and outside.

Carbon dioxide (CO2) equilibrator works together with carbon dioxide (CO2) gas analyzer (insttypes_id 183) 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:MI_Instrument>
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      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bec4">
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                <gco:CharacterString>thermosalinograph</gco:CharacterString>
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            <gco:CharacterString>thermosalinograph</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>automated sea surface temperature and salinity instrument, usually attached to the hull of a ship

Thermosalinograph is an automated Sea Surface Temperature and Salinity measurement system making measurement on board a ship using a water intake.
[https://www.aoml.noaa.gov/phod/tsg/about.php 2021-01-29]</gco:CharacterString>
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        <gmi:MI_Platform id="plat_bcdc">
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              <gmd:code>
                <gco:CharacterString>AURORA AUSTRALIS</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>Flag: Australia
Vessel Type: Oceanographic Research</gco:CharacterString>
          </gmi:description>
          <gmi:instrument gco:nilReason="missing" />
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      </gmi:platform>
    </gmi:MI_AcquisitionInformation>
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