gov.noaa.nodc:0246726 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2026-03-31T13:12:16Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Surface underway measurements of partial pressure of CO2 (pCO2), salinity and water temperature obtained during the CCGS Amundsen cruise (EXPOCODE 18DL20180525) in Hudson Bay, Labrador Sea from 2018-05-25 to 2018-07-13 (NCEI Accession 0246726) 2022-01-28 publication 2022-01-27 creation International DOI Foundation (IDF) 10.25921/2f2z-7462 NOAA National Centers for Environmental Information gov.noaa.nodc:0246726 NCEI Archive Management System 0246726 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Mohamed Ahmed University of Calgary mohamed.ahmed3@ucalgary.ca https://www.ucalgary.ca/ HTTPS University of Calgary website Institution web page information resourceProvider University of Calgary https://www.ucalgary.ca/ HTTPS University of Calgary website Institution web page information resourceProvider Mohamed Ahmed Geography Department, University of Calgary, Canada mohamed.ahmed3@ucalgary.ca principalInvestigator Brent Else Geography Department, University of Calgary, Canada belse@ucalgary.ca principalInvestigator Tim Papakyriakou University of Manitoba tim.papakyriakou@umanitoba.ca https://umanitoba.ca/ HTTPS University of Manitoba website Institution web page information principalInvestigator Ahmed, Mohamed Geography Department, University of Calgary, Canada author Else, Brent Geography Department, University of Calgary, Canada author Papakyriakou, Tim University of Manitoba https://umanitoba.ca/ HTTPS University of Manitoba website Institution web page information author University of Calgary https://www.ucalgary.ca/ HTTPS University of Calgary website Institution web page information contributor University of Manitoba https://umanitoba.ca/ HTTPS University of Manitoba website Institution web page information contributor tableDigital This dataset includes surface underway, chemical, meteorological and physical data collected during the CCGS Amundsen cruise (EXPOCODE 18DL20180525) in Hudson Bay, Labrador Sea from 2018-05-25 to 2018-07-13. These data include partial pressure of CO2 (pCO2), fugacity of CO2 (fCO2), mol fraction of CO2 (xCO2), sea surface salinity and sea surface temperature. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: ArcticNet completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0246726 Preview graphic PNG 0246726 NCEI ACCESSION NUMBER 2022-01-21 publication BAROMETRIC PRESSURE partial pressure of carbon dioxide - water SALINITY - SURFACE WATER WATER TEMPERATURE xCO2 seawater theme NODC DATA TYPES THESAURUS barometric pressure sensor carbon dioxide (CO2) gas analyzer salinometer showerhead equilibrator temperature sensor instrument NODC INSTRUMENT TYPES THESAURUS chemical meteorological physical surface underway theme NODC OBSERVATION TYPES THESAURUS CCGS Amundsen platform NODC PLATFORM NAMES THESAURUS University of Calgary University of Manitoba dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS University of Calgary dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Ship of Opportunity Programme (SOOP) Surface Ocean CO2 Atlas (SOCAT) project NODC PROJECT NAMES THESAURUS Hudson Bay Labrador Sea place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication U-Calgary > University of Calgary dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Hudson Bay project Cruise ID 18DL20180525 project EXPOCODE Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords Canadian Arctic Archipelago project Reference Section ID Surface water pCO2 measurements in Hudson Bay during the spring and early-summer seasons project Research Projects EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SURFACE SALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Surface underway theme OCADS Study Type PRES_EQU PRES_LICOR SSS SST TEMP_EQU TEMP_LICOR xCO2_EQU_ppm xH2O_EQU theme Provider Variable Abbreviations BAROMETERS > BAROMETERS CO2 ANALYZERS > CO2 ANALYZERS EQUILIBRATORS SALINOMETERS TEMPERATURE SENSORS > TEMPERATURE SENSORS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Ships platform Global Change Master Directory (GCMD) Platform Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Amundsen (call sign: CGDT, ICES code: 18DL, 2003-) platform ICES/SeaDataNet Ship Codes OCEAN > ARCTIC OCEAN OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN place Global Change Master Directory (GCMD) Location Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Hudson Bay Labrador Sea place Provider Geographic Names accessLevel: Public otherRestrictions Cite as: Ahmed, Mohamed; Else, Brent; Papakyriakou, Tim (2022). Surface underway measurements of partial pressure of CO2 (pCO2), salinity and water temperature obtained during the CCGS Amundsen cruise (EXPOCODE 18DL20180525) in Hudson Bay, Labrador Sea from 2018-05-25 to 2018-07-13 (NCEI Accession 0246726). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/2f2z-7462. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. Canadian Arctic Archipelago Cruises 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/VOS_Program/canarch.html HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/VOS_Program/canarch.html Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system 2022-04 publication https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system HTTPS https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system OCADS website information NOAA National Centers for Environmental Information author NOAA National Centers for Environmental Information (NCEI) publisher documentDigital [accessed 2024-02-08] crossReference program eng; USA utf8 environment oceans climatologyMeteorologyAtmosphere -95 -61 55.2 64.3 2018-05-25 2018-07-13 NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact 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. Contact NCEI for other distribution options and instructions. Originator data format 2.268 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0246726.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/2f2z-7462 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/246726 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/246726 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0194/0246726/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0246726 v1.1 was published. 2022-01-28T23:07:11Z NCEI Accession 0246726 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0246726/1.1 HTTPS NCEI Accession 0246726 v1.1 published 2022-01-28T23:07:11Z download dataset Parameter or Variable: pCO2 (fCO2) autonomous; Abbreviation: xCO2_EQU_ppm; Unit: micromol per mol (or ppm); Observation type: surface underway; Measured or calculated: measured; Sampling instrument: GO 8050 underway pCO2 system; Location of seawater intake: engine room of CCGS Amundsen; Analyzing instrument: non-dispersive Infrared gas analyzer; Detailed sampling and analyzing information: See Pierrot et al. [2009] for more details on GO 8050 underway system. pCO2 is calculated from the CO2 molar fraction, the equilibrator pressure, and the water vapour pressure (estimated from surface water salinity and temperature using Weiss and Price [1980]) following Dickson et al. [2007]. Then a temperature correction was applied to account for warming of seawater from the seawater intake to the GO8050 equilibrator. A temperature sensor was installed directly at the seawater intake to measure in-situ SST directly, and we used these values to temperature-correct our pCO2 values using the formula from Takahashi et al. (1993); Equilibrator type: shower-type equilibrator; Is the equilibrator vented or not: vented; Water flow rate: 2.4-2.8 L/min; Gas flow rate: ~100 ml/min; How was temperature inside the equilibrator measured: Temperature inside the equilibarator measured with a very accurate (±0.01 °C) and stable Hart digital thermometer with a thermistor probe. However, we applied a temperature correction to account for warming from the seawater intake line to the GO 8050 equilibrator. The temperature correction was done with a regression analysis between the equilibrator water temperature and it's coincident seawater measurements made by the ship's CTD-rosette. The computed SST values from this linear relationship are the temperatures at which our pCO2 values are reported. Details about this regression, and the statistics of it are included in the second tab of this spreadsheet.; How was pressure inside the equilibrator measured: Setra pressure transducer, differential measurement; Drying method for gas: headspace gas from the equilibrator goes through a condensor, then Naphion drying tubes, then to the CO2 analyzer; SEA CO2 gas detector manufacturer: LICOR; SEA CO2 gas detector model: LI-7000; SEA CO2 gas detector resolution: the precision of the measurements is ± 1 ppm (see Pierrot et al. 2009) the accuracy of the instrument is nominal ± 1% (see Pierrot et al. 2009); Standardization technique: The LI-7000 is calibrated with a zero CO2 gas (ultra-pure N2 gas from Praxair), and three span gases (254.5, 431.3, and 554.2 ppm from Praxair), twice daily. These are secondary standards, which are calibrated using primary standards from NOAA.; Standardization frequency: twice daily; Standard gas manufacturer: Praxair; Standard gas concentration: zero CO2 gas (ultra-pure N2 gas from Praxair), and three span gases (at concentrations of 295.8, 448.6, and 551.7 ppm from Praxair); Standard gas uncertainty: since the concentrations of standard gases are measured using the LI-7000 after a calibration with NOAA standards, the uncertainty of the standard gas CO2 concentrations should be +/- 1 ppm; Water vapor correction method: Weiss and Price [1980]; Temperature correction method: Takahashi et al. [1993]; At what temperature was pCO2 reported: pCO2 is reported at SST temperatures (measured by a temperature sensor located directly at the seawater intake); Uncertainty: Uncertainty of +/- 2 ppm (Pierrot et al., 2009); Method reference: Pierrot, D., Neill, C., Sullivan, K., Castle, R., Wanninkhof, R., Lüger, H., Johannessen, T., Olsen, A., Feely, R. A., & Cosca, C. E. (2009). Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep Sea Research Part II: Topical Studies in Oceanography, 56(8-10), 512-522. https://doi.org/10.1016/j.dsr2.2008.12.005; Researcher name: Mohamed Ahmed; Researcher institution: University of Calgary Parameter or Variable: H2O molar fraction; Abbreviation: xH2O_EQU; Unit: millimol per mol (or ppt); Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: LI-7000; Uncertainty: The precision of the measurements is 0.05 ppt, and the accuracy of the instrument is 1% Parameter or Variable: temperature of gas analyzer; Abbreviation: TEMP_LICOR; Unit: degrees celcius; Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: temperature sensor inside the LI-7000 is the Betatherm model 100K6MBD1; Uncertainty: accuracy better than 0.05 deg C Parameter or Variable: pressure of gas analyzer; Abbreviation: PRES_LICOR; Unit: hPa; Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: pressure sensor inside LI-7000 is the 13A-015A pressure sensor.; Uncertainty: accuracy of 0.1% Parameter or Variable: pressure inside equilibrator; Abbreviation: PRES_EQU; Unit: hPa; Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: Setra pressure transducer, differential measurement; Uncertainty: accuracy of +/- 0.027 hPa; Method reference: calculated PRES_EQU by adding differential pressure measurement from Setra pressure transducer to PRES_LICOR (ambient pressure) Parameter or Variable: temperature of water inside equilibrator; Abbreviation: TEMP_EQU; Unit: degrees celcius; Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: Hart thermometer; Uncertainty: accuracy of +/- 0.025 deg C Parameter or Variable: sea surface temperature; Abbreviation: SST; Unit: degrees celcius; Observation type: surface underway; Analyzing instrument: Omega type T thermocouple; Uncertainty: 0.5 deg C standard limit of error, for more information (ANSI code T): https://www.omega.ca/techref/colorcodes.html Parameter or Variable: sea surface salinity; Abbreviation: SSS; Unit: practical salinity units; Observation type: surface underway; Sampling instrument: GO 8050 underway pCO2 system; Analyzing instrument: Idronaut Ocean Seven model 315; Uncertainty: accuracy of 0.003 mS/cm in conductivity measurement asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian barometric pressure sensor barometric pressure sensor instrument used to measure the atmospheric pressure. carbon dioxide (CO2) gas analyzer carbon dioxide (CO2) gas analyzer 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. salinometer salinometer generic salinometer use salinometer when the instrument type used is unclear but the data include salinity measurements showerhead equilibrator showerhead equilibrator 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. temperature sensor temperature sensor A sensor used to measure temperature. CCGS Amundsen ICES request for the vessel Amundsen from CANADA. NOTE: Canada platform SIR JOHN FRANKLIN (NODC Code=18SZ) is a previous name for this platform and had the same call sign. Name : Amundsen Flag : CANADA - CA (ISO Country Code) Call Sign : CGDT Title : CCGS Platform Class : 31 Research vessel IMO : 7510846 Commissioned Date : 2003 Current Length : 98.33 Built : 1979 Previous Name (Notes): SIR JOHN FRANKLIN Notes : Converted to coast guard icebreaker/research vessel in 2003 Additional Information Sources: - http://www.amundsen.ulaval.ca/index.php?url=11210 Same Vessels Info: 18SZ - SIR JOHN FRANKLIN Confirmed by NOAA on 2013-04-15.