NDLI: Evaluation of the net CO$_{2}$ uptake in the Canada Basin in the summer of 2008

Content Provider	Springer Nature Link
Author	Sun, Heng Gao, Zhongyong Lu, Peng Xiu, Peng Chen, Liqi
Copyright Year	2017
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 CO$_{2}$ (ρCO$_{2}$) was measured, and sea water samples were collected for CO$_{2}$ measurement in the Canada Basin. The distribution of ρCO$_{2}$ in the Canada Basin was determined, the influencing factors were addressed, and the air-sea CO$_{2}$ 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, ρCO$_{2}$ was high (320 to 368 μatm, 1 μatm=0.101 325 Pa), primarily due to rapid equilibration with atmospheric CO$_{2}$ over a short time. In the partially ice-covered zone, the surface ρCO$_{2}$ was relatively low (250 to 270 μatm) due to ice-edge blooms and icemelt water dilution. In the heavily ice-covered zone, the seawater ρCO$_{2}$ varied between 270 and 300 μatm due to biological CO$_{2}$ removal, the transportation of low ρCO$_{2}$ water northward, and heavy ice cover. The surface seawater ρCO$_{2}$ during the survey was undersaturated with respect to the atmosphere in the Canada Basin, and it was a net sink for atmospheric CO$_{2}$. The summertime net CO$_{2}$ 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=10$^{12}$ g), respectively. Overall, the net CO$_{2}$ 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 CO$_{2}$ sink.
Starting Page	94
Ending Page	100
Page Count	7
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	36
Issue Number	8
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2017-06-06
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Canada Basin net CO$_{2}$ uptake partial pressure of CO$_{2}$ Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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