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                <gco:CharacterString>Ocean Acidification Search Keywords</gco:CharacterString>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="platform">platform</gmd:MD_KeywordTypeCode>
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              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
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                <gco:CharacterString>NCEI Accession 0110256 was revised and v3.3 was published.</gco:CharacterString>
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                <gco:DateTime>2013-07-20T13:08:20Z</gco:DateTime>
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                <gco:CharacterString>NCEI Accession 0110256 was revised and v4.4 was published.</gco:CharacterString>
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                <gco:DateTime>2016-12-11T20:08:09Z</gco:DateTime>
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                        <gco:CharacterString>NCEI Accession 0110256 v4.4</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: Total alkalinity;
Abbreviation: TA;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Type of titration: potentiometric titration;
Curve fitting method: Alkalinity was measured by single point potentiometric titration. automatic titrator "Titrino Metrohm" and a pH-glass electrode were used.</gco:CharacterString>
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Abbreviation: pH;
pH scale: Measured on TS@25C, reported on SWS@25C;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Temperature of pH measurement: 25;
Detailed sampling and analyzing information: pH was measured spectrophotometrically (Clayton and Burne 1993)</gco:CharacterString>
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Abbreviation: CTDTMP;
Unit: DEG_C;
Controlled vocabulary name: WATER TEMPERATURE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: SALNTY;
Controlled vocabulary name: SALINITY;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: CTDOXY;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED OXYGEN;
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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                <gco:CharacterString>Parameter or Variable: SILCAT;
Abbreviation: SILCAT;
Unit: UMOL/KG;
Controlled vocabulary name: silicate;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: NITRAT;
Unit: UMOL/KG;
Controlled vocabulary name: NITRATE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: ALKALI;
Abbreviation: ALKALI;
Unit: UMOL/KG;
Controlled vocabulary name: total alkalinity;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: PH_SWS;
Abbreviation: PH_SWS;
Unit: @25C;
Controlled vocabulary name: pH;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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            <gmi:LE_ProcessStep>
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                <gco:CharacterString>Parameter or Variable: PH_TMP;
Abbreviation: PH_TMP;
Unit: DEG_C;
Controlled vocabulary name: pH;
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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                <gco:DateTime>2015-04-22T00:00:00</gco:DateTime>
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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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An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.

Butler, L. R. P.; Laqua, K. (1995). "Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)". Pure Appl. Chem. IUPAC. 67 (10): 1725–1744. doi:10.1351/pac199567101725. A spectrometer is the general term for describing a combination of spectral apparatus with one or more detectors to measure the intensity of one or more spectral bands."</gco:CharacterString>
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