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                <gco:CharacterString>Parameter or Variable: Total alkalinity;
Abbreviation: TA;
Unit: micromoles per kilogram;
Observation type: surface underway;
Measured or calculated: Measured;
Sampling instrument: CONTROS HydroFIAÂ® TA;
Analyzing instrument: CONTROS HydroFIAÂ® TA;
Type of titration: single acid addition;
Detailed sampling and analyzing information: An inline filter (0.2 Âµm) with small 50 mL overflow reservoir for filtered seawater was supplied with the ship's underway seawater supply. The HydroFIA TA then drew the sample from the reservoir into the instrument for analysis. The HydroFIA TA instrument performed a single-point titration of seawater with 0.1N hydrochloric acid (HCl), using bromocresol green (BCG) as the indicator for spectrophotometric pH detection.;
Replicate information: 2.0 Âµmol/kg, calculated as one standard deviation of triplicate measurements of certified reference material;
Standardization description: The instrument was initially calibrated before departure using certified reference material (CRM) obtained from Dr. Andrew Dickson at Scripps Institution of Oceanography. Instrument stability was then checked periodically during the cruise using CRM. For more details regarding instrument deployment and performance, see Hunt et al. (2021, Marine Chemistry 232, 103960). CRM Batch 198 was used during this cruise.;
CRM manufacturer: Dr. Andrew Dickson, Scripps Institute of Oceanography;
CRM batch number: 198;
Preservation method: none;
Preservative volume: none;
Preservative correction: none;
Uncertainty: 2.3Â±13;
Method reference: AÃmann, S., Frank, C., Petersen, W., KÃ¶rtzinger, A., 2013. Autonomous pH and alkalinity sensors for the characterization of the carbonate system in coastal areas. Presented at the EGU General Assembly Conference Abstracts, pp. EGU2013-8760.Seelmann, K., AÃmann, S., KÃ¶rtzinger, A., 2019. Characterization of a novel autonomous analyzer for seawater total alkalinity: Results from laboratory and field tests. Limnology and Oceanography: Methods 17, 515â532. https://doi.org/10.1002/lom3.10329 Hunt, C. W., J. E. Salisbury, D. Vandemark, S. AÃmann, P. Fietzek, C. Melrose, R. Wanninkhof, and K. Azetsu-Scott. 2021. Variability of USA East Coast surface total alkalinity distributions revealed by automated instrument measurements. Marine Chemistry 232: 103960. doi:10.1016/j.marchem.2021.103960;
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Abbreviation: sss;
Unit: psu;
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Abbreviation: sst;
Unit: degrees Celcius;
Observation type: surface underway;
Analyzing instrument: SBE-45;
Detailed sampling and analyzing information: Seawater temperature was measured from a continuous surface seawater supply (intake depth about 3 m) using a Seabird SBE-45 thermosalinograph (Sea-bird Electronics, Bellevue WA).;
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[https://www.aoml.noaa.gov/phod/tsg/about.php 2021-01-29]</gco:CharacterString>
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Vessel Type: Research Vessel (Oceanographic)
DOB: Mar 1997
IMO: 9105798

AS OF 3/3/1997 - WHOI
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