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Underway pCO2 Measurements in Surface Waters and the Atmosphere During R/V Xue Long CHINARE2012 Expedition in the west Arctic Ocean from 2012-07-17 to 2012-09-12 (NCEI Accession 0168338)

INVESTIGATORS:
Liqi Chen - Key Laboratory of Global Change and Marine - Atmospheric Chemistry (GCMAC)
Wei-Jun Cai ORCID logo - University of Delaware
Zhangxian Ouyang ORCID logo - University of Delaware

PACKAGE DESCRIPTION: The underway surface and atmospheric CO2 levels were measured in the west Arctic Ocean during the 5th Chinese National Arctic Research Expedition (CHINARE2012) from 2012-07-17 to 2012-09-12. The system was monitored and calibrated with three certified gas standards and a zero gas every 3 hours. The dataset was reduced by the MatLab program pCO2 Sys v126, following the procedure in Pierrot et al. (2009). The Accession 0168338 includes measurements of fugacity of CO2 (fCO2) in sea water at sea water temperature, fugacity of CO2 (fCO2) in atmosphere, sea surface temperature, sea surface salinity, atmospheric pressure, and delta fCO2 between sea water and atmosphere (fCO2w - fCO2a).

CITE AS: Chen, Liqi; Sun, Heng; Chen, Baoshan; Ouyang, Zhangxian; Cai, Wei-Jun (2017). Underway pCO2 Measurements in Surface Waters and the Atmosphere During R/V Xue Long CHINARE2012 Expedition in the west Arctic Ocean from 2012-07-17 to 2012-09-12 (NCEI Accession 0168338). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5j964nm. Accessed [date].


DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0168338
NCEI DOI: https://doi.org/10.7289/v5j964nm
EXPOCODE: 76XL20120717;
CRUISE ID: CHINARE12;

TYPES OF STUDY:
Surface underway;

TEMPORAL COVERAGE:
START DATE: 2012-07-17
END DATE: 2012-09-12

SPATIAL COVERAGE:
NORTH: 81.94
WEST: -174.03
EAST: -162.74
SOUTH: 65

GEOGRAPHIC NAMES:
Arctic Ocean;

PLATFORMS:
R/V Xue Long (ID: 76XL);

RESEARCH PROJECT(S):
none;

VARIABLES / PARAMETERS:

pCO2 (fCO2) autonomous
Abbreviation: fCO2_SW@SST
Unit: micro-atmosphere
Observation type: surface underway
Measured or calculated: measured
Sampling instrument: underway water pump
Location of seawater intake: near seachest with ice grating (port side of Xuelong)
Analyzing instrument: underway pCO2 GO-system
Detailed sampling and analyzing information: see Pierrot et al., 2009
Equilibrator type: Sprayhead above dynamic pool, no thermal jacket (shower head type equilibrator)
Equilibrator volume: 0.95 L (0.4 L water, 0.55 L headspace)
Is the equilibrator vented or not: No
Water flow rate: 1.5 - 2.5 L/min
Gas flow rate: 70 - 150 ml/min
Drying method for gas: Gas stream passes through a thermoelectric condenser (~5 deg C) and then through a Perma Pure (Nafion) dryer before reaching the analyzer (90% dry).
SEA CO2 gas detector manufacturer: LI-COR
SEA CO2 gas detector resolution: 0.01 microatmosphere
SEA CO2 gas detector uncertainty: 1 microatmospheres
Standardization frequency: every 3 hours
Standard gas concentration: 0, 244.25, 366.86, 546.98 ppm
At what temperature was pCO2 reported: in situ temperature
Uncertainty: 2 microatmosphere in fCO2_SW
Quality flag convention: 2=good, 3=questionable
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
Sea Surface Temperature
Abbreviation: SST
Unit: degree Celsius
Analyzing instrument: Seabird (SEB)
Uncertainty: Accuracy: 0.01 degree Celsius; Precision: 0.001 degree Celsius
Sea Surface Salinity
Abbreviation: SSS
Unit: (none)
Sampling instrument: Seabird (SEB-45)
Uncertainty: Accuracy: 0.005 ; Precision: 0.0002
Atmospheric Pressure at the sea surface
Abbreviation: PRES_ATM@SSP
Unit: hPa
Temperature recorded from inside the equilibrator
Abbreviation: TEMP_EQU
Unit: degree Celsius
Pressure inside the equilibrator
Abbreviation: PRES_EQU
Unit: hPa
Mole fraction of carbon dioxide inside the equilibrator
Abbreviation: xCO2_EQU
Unit: ppm
Mole fraction of carbon dioxide in the atmosphere
Abbreviation: xCO2_ATM_interpolated
Unit: ppm
Fugacity of seawater carbon dioxide after corrected to the in-situ sea surface temperature
Abbreviation: fCO2_SW@SST
Unit: microatmosphere
Interpolated atmospheric fCO2
Abbreviation: fCO2_ATM_interpolated
Unit: microatmosphere
Delta fCO2 between sea water and atmosphere (fCO2w - fCO2a)
Abbreviation: dfCO2
Unit: microatmosphere
PUBLICATIONS DESCRIBING THIS DATASET:
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
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
National Natural Science Foundation of China; US National Science Foundation (NSF)
PROJECT TITLE:
PROJECT ID: 41230529, 41476172, 41476173 and 41406221; NSF-ARC-0909330 and NSF PLR-1304337

SUBMITTED BY: Wei-Jun Cai (wcai@udel.edu)

SUBMISSION DATE: 2017-11-15