Surface underway measurements of partial pressure of CO2 (pCO2) and other parameters aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26 (NCEI Accession 0177875)
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title: Surface underway measurements of partial pressure of CO2 (pCO2) and other parameters aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26 (NCEI Accession 0177875)
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abstract: This dataset includes surface underway, chemical, meteorological and physical data collected aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26. These data include partial pressure of carbon dioxide (pCO2), barometric pressure, sea surface salinity and sea surface temperature. The instruments used to collect these data include CO2 gas analyzer and shower head chamber equilibrator for autonomous CO2 measurement.
purpose: The major objectives of this cruise is to provide a high quality measurements of atmospheric and sea surface pCO2, sea surface salinity, temperature, and other parameters in the Canadian Arctic Arcipelago.
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title: Ahmed, M., Else, B. G. T., Burgers, T. M., Papakyriakou, T. (2019). Variability of Surface Water pCO2 in the Canadian Arctic Archipelago from 2010 to 2016. Journal of Geophysical Research: Oceans. https://doi.org/10.1029/2018JC014639
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Anchor: https://orcid.org/0000-0002-6516-0190 Ahmed, M.
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Anchor: https://orcid.org/0000-0003-0002-7011 Else, B. G. T.
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Anchor: https://orcid.org/0000-0002-9974-6405 Burgers, T. M.
organisationName: Centre for Earth Observation Science, Department of Environment and GeographyUniversity of Manitoba Winnipeg Manitoba Canada
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individualName: Papakyriakou, T.
organisationName: Centre for Earth Observation Science, Department of Environment and GeographyUniversity of Manitoba Winnipeg Manitoba Canada
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name: J. Geophys. Res. Oceans
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beginPosition: 2016-08-02
endPosition: 2016-09-26
supplementalInformation: In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number.
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description: NCEI Accession 0177875 was revised and v2.2 was published.
rationale: 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.
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description: Parameter or Variable: pCO2 (fCO2) autonomous; Abbreviation: pCO2_SW_Uatm; fCO2_SW_uatm; xCO2_EQU_ppm; Unit: uatm, ppm; Observation type: Surface underway; Measured or calculated: Measured; Sampling instrument: Seawater pump; Location of seawater intake: engine room of CCGS Amundsen; Analyzing instrument: Infrared Analyzer: LI-COR model 7000; Detailed sampling and analyzing information: This automated underway system operates by directing the seawater flow from a high-volume inlet (located approximately at 7 m beneath the water surface) through a shower-type equilibrator system. The gas in the headspace of the equilibrator is cycled in a closed loop through a LI-COR LI-7000 CO2/H2O gas analyzer at a rate of 80-100 ml min-1 to measure CO2 and H2O mole fraction. See Pierrot, D., C. Neil, K. Sullivan, R. Castle, R. Wanninkhof, H. Lüger, T. Johannessen, A. Olsen, R. A. Feely, and C. E. Cosca (2009), Recommendations for autonomous underway pCO2 measuring systems and data reduction routines, Deep-Sea Res II, 56, 512-522; 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 bt the shup'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: pressure of gas analyzer (TE connectivity), 13A-015A pressure sensor; sensor was logged to save measurements every minute; accuracy of 0.1% for pressure sensor.; Drying method for gas: The heaspace gas from the equilibrator goes through a condensor, then Naphion drying tubes, then to the CO2 analyzer; SEA CO2 gas detector manufacturer: Licor, Inc; SEA CO2 gas detector model: Licor 7000; SEA CO2 gas detector resolution: The accuracy of the instrument is nominal ±1% (see Pierrot et al. 2009); SEA CO2 gas detector uncertainty: The precision of the measurements is ± 1 ppm (see Pierrot et al. 2009); Standardization technique: The system runs a full cycle in approximately 7 hours. The cycle starts with 4 standard gases, then measures three rounds of 6 atmopherice samples followed by 50 surface water samples. Each new gas is flushed through the Licor Analyzer for 2 minutes prior to a stop-flow measurement.; Standardization frequency: Every 7 hours; Standard gas manufacturer: zero CO2 gas (ultra-pure N2 gas from Praxair), and two span gases (373.07 ppm and 600.02 ppm from Praxair); Standard gas uncertainty: 0.01 ppm; Water vapor correction method: Details of the data reduction are described in Pierrot, et.al. (2009).; Temperature correction method: Details of the data reduction are described in Pierrot, et.al. (2009).; At what temperature was pCO2 reported: In situ sea surface temperature; Uncertainty: accuracy better than 0.05 deg C for temp. sensor of gas analyzer; 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.
processStep: (LE_ProcessStep)
description: Parameter or Variable: Sea Surface Temperature; Abbreviation: SST_C; Unit: degrees celcius; Observation type: Surface Underway; Sampling instrument: temperature (Idronaut); Analyzing instrument: Idronaut Ocean Seven model 315; Detailed sampling and analyzing information: sensor was logged to save measurements every minute; Uncertainty: accuracy of 0.002 deg C for water temperature; Researcher name: Mohamed Ahmed; Researcher institution: University of Calgary.
processStep: (LE_ProcessStep)
description: Parameter or Variable: Sea Surface Salinity; Abbreviation: SAL_permil; Observation type: Surface Underway; Sampling instrument: salinity (Idronaut); Analyzing instrument: Idronaut Ocean Seven model 315; Detailed sampling and analyzing information: sensor was logged to save measureements every minute; Uncertainty: accuracy of 0.003 mS/cm in conductivity measurement; Researcher name: Mohamed Ahmed; Researcher institution: University of Calgary.
processStep: (LE_ProcessStep)
description: Parameter or Variable: Atmospheric Pressure; Abbreviation: PRES_ATM@SSP_hPa; Unit: hPa; Observation type: athmospheric; Sampling instrument: pressure of equilibrator (Setra); Analyzing instrument: 239 setra pressure transducer; Detailed sampling and analyzing information: sensor was logged to save measurements every minute; Uncertainty: accuracy of 0.027 hPa for the Setra pressure transducer; Researcher name: Mohamed Ahmed; Researcher institution: University of Calgary .
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
maintenanceNote: NCEI Accession 0177875 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest 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. Please see journal.txt in the /about directory for additional details on changes made.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: carbon dioxide (CO2) gas analyzer
type: carbon dioxide (CO2) gas analyzer
description: 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.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: showerhead equilibrator
type: showerhead equilibrator
description: 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.
platform: (MI_Platform)
identifier: (MD_Identifier)
code: CCGS Amundsen
description: 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.
instrument: (missing)
