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)
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].
Surface underway;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
VARIABLES / PARAMETERS:
pCO2 (fCO2) autonomous | |
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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 | |
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Abbreviation: | SST |
Unit: | degree Celsius |
Analyzing instrument: | Seabird (SEB) |
Uncertainty: | Accuracy: 0.01 degree Celsius; Precision: 0.001 degree Celsius |
Sea Surface Salinity | |
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Abbreviation: | SSS |
Unit: | (none) |
Sampling instrument: | Seabird (SEB-45) |
Uncertainty: | Accuracy: 0.005 ; Precision: 0.0002 |
Atmospheric Pressure at the sea surface | |
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Abbreviation: | PRES_ATM@SSP |
Unit: | hPa |
Temperature recorded from inside the equilibrator | |
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Abbreviation: | TEMP_EQU |
Unit: | degree Celsius |
Pressure inside the equilibrator | |
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Abbreviation: | PRES_EQU |
Unit: | hPa |
Mole fraction of carbon dioxide inside the equilibrator | |
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Abbreviation: | xCO2_EQU |
Unit: | ppm |
Mole fraction of carbon dioxide in the atmosphere | |
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Abbreviation: | xCO2_ATM_interpolated |
Unit: | ppm |
Fugacity of seawater carbon dioxide after corrected to the in-situ sea surface temperature | |
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Abbreviation: | fCO2_SW@SST |
Unit: | microatmosphere |
Interpolated atmospheric fCO2 | |
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Abbreviation: | fCO2_ATM_interpolated |
Unit: | microatmosphere |
Delta fCO2 between sea water and atmosphere (fCO2w - fCO2a) | |
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Abbreviation: | dfCO2 |
Unit: | microatmosphere |
SUBMITTED BY: Wei-Jun Cai (wcai@udel.edu)
SUBMISSION DATE: 2017-11-15