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                                    <gco:CharacterString>NCEI Accession 0100217 v3.3</gco:CharacterString>
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                                    <gco:CharacterString>published 2016-12-09T17:22:31Z</gco:CharacterString>
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                <gco:CharacterString>NCEI Accession 0100217 was revised and v4.4 was published.</gco:CharacterString>
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                <gco:CharacterString>Updates were received for this dataset. These updates were copied into the data/0-data/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.</gco:CharacterString>
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                                <gmd:CI_OnlineResource>
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                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0100217/4.4</gmd:URL>
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                                    <gco:CharacterString>NCEI Accession 0100217 v4.4</gco:CharacterString>
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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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Abbreviation: ATM_PRE;
Unit: DBAR;
Controlled vocabulary name: BAROMETRIC PRESSURE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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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: OXYGEN;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED OXYGEN;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: OXYGEN_TMP;
Unit: DEG_C;
In-situ / Manipulation / Response variable: in-situ observation</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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        <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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        </gmd:CI_ResponsibleParty>
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        <gmi:MI_Instrument id="inst_be50">
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            <gco:CharacterString>This type of equilibrators are often used on buoys.

Developed by Pacific Marine Environmental Laboratory and Monterey Bay Aquarium Research Institute, the h-shaped bubble equilibrator does not require a water pump to spray water from the top.

see Takahashi 1961 for more information.</gco:CharacterString>
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                <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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            <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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            <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>moorings</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>entry created as MOORINGS OF UNITED STATES, but has been used as a generic MOORINGS entry.</gco:CharacterString>
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          <gmi:instrument gco:nilReason="missing" />
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