Cite this paper:
HE Jianhua, YU Wen, LIN Wuhui, MEN Wu, CHEN Liqi. Particulate organic carbon export fl uxes on Chukchi Shelf, western Arctic Ocean, derived from 210Po/210Pb disequilibrium[J]. Journal of Oceanology and Limnology, 2015, 33(3): 741-747

Particulate organic carbon export fl uxes on Chukchi Shelf, western Arctic Ocean, derived from 210Po/210Pb disequilibrium
HE Jianhua1,2,3, YU Wen2, LIN Wuhui2,3,4, MEN Wu2, CHEN Liqi2,3
1 College of Oceanography and Environment Science, Xiamen University, Xiamen 361005, China;
2 Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;
3 Key Lab of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China;
4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
Abstract:
Fluxes of particulate organic carbon (POC) were derived from 210Po/210Pb disequilibrium during the 4th Chinese National Arctic Research Expedition (CHINARE-4) from July 1 to September 28, 2010. Average residence times of particulate 210 Po in the euphotic zone were -16.00 a to 1.54 a, which are higher than those of dissolved 210 Po (-6.89 a to -0.70 a). Great excesses of dissolved 210 Po were observed at all stations, with an average 210Po/210Pb ratio of 1.91±0.20, resulting from 210Pb atmospheric deposition after sea ice melt. POC fluxes from the euphotic zone were estimated by two methods (E and B) in the irreversible scavenging model. Estimated POC fluxes were 945-126 mmol C/(m2 ·a) and 1 848-109 mmol C/(m2 ·a) by methods E and B, respectively, both decreasing from low to high latitude. The results are comparable to previous works for the same region, indicating efficient biological pumping in the Chukchi Sea. The results can improve understanding of the carbon cycle in the western Arctic Ocean.
Key words:    particulate organic carbon (POC) fl ux|210Po/210Pb disequilibrium|Chukchi Shelf   
Received: 2014-01-19   Revised: 2014-08-27
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