Evaluation of the net CO<sub>2</sub> uptake in the Canada Basin in the summer of 2008

SUN Heng; GAO Zhongyong; LU Peng; XIU Peng; CHEN Liqi

doi:10.1007/s13131-017-1028-9

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Article Navigation > Acta Oceanologica Sinica > 2017 > 36(8): 94-100

SUN Heng, GAO Zhongyong, LU Peng, XIU Peng, CHEN Liqi. Evaluation of the net CO2 uptake in the Canada Basin in the summer of 2008[J]. Acta Oceanologica Sinica, 2017, 36(8): 94-100. doi: 10.1007/s13131-017-1028-9

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SUN Heng, GAO Zhongyong, LU Peng, XIU Peng, CHEN Liqi. Evaluation of the net CO₂ uptake in the Canada Basin in the summer of 2008[J]. Acta Oceanologica Sinica, 2017, 36(8): 94-100. doi: 10.1007/s13131-017-1028-9

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Evaluation of the net CO₂ uptake in the Canada Basin in the summer of 2008

doi: 10.1007/s13131-017-1028-9

1.
Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
3.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2016-07-31

Abstract

Abstract

The third Chinese National Arctic Research Expedition (CHINARE) was conducted in the summer of 2008. During the survey, the surface seawater partial pressure of CO₂ (pCO₂) was measured, and sea water samples were collected for CO₂ measurement in the Canada Basin. The distribution of pCO₂ in the Canada Basin was determined, the influencing factors were addressed, and the air-sea CO₂ flux in the Canada Basin was evaluated. The Canada Basin was divided into three regions:the ice-free zone (south of 77°N), the partially ice-covered zone (77°-80°N), and the heavily ice-covered zone (north of 80°N). In the ice-free zone, pCO₂ was high (320 to 368 μatm, 1 μatm=0.101 325 Pa), primarily due to rapid equilibration with atmospheric CO₂ over a short time. In the partially ice-covered zone, the surface pCO₂ was relatively low (250 to 270 μatm) due to ice-edge blooms and ice-melt water dilution. In the heavily ice-covered zone, the seawater pCO₂ varied between 270 and 300 μatm due to biological CO₂ removal, the transportation of low pCO₂ water northward, and heavy ice cover. The surface seawater pCO₂ during the survey was undersaturated with respect to the atmosphere in the Canada Basin, and it was a net sink for atmospheric CO₂. The summertime net CO₂ uptake of the ice-free zone, the partially ice-covered zone and the heavily ice-covered zone was (4.14±1.08), (1.79±0.19), and (0.57±0.03) Tg/a (calculated by carbon, 1 Tg=10¹² g), respectively. Overall, the net CO₂ sink of the Canada Basin in the summer of 2008 was (6.5±1.3) Tg/a, which accounted for 4%-10% of the Arctic Ocean CO₂ sink.
- Canada Basin,
- net CO₂ uptake,
- partial pressure of CO₂

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