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Fluxes of particulate organic carbon(POC) were derived from 2 10 Po/ 210 Pb disequilibrium during the 4th Chinese National Arctic Research Expedition(CHINARE-4) from July 1 to September 28,2010. Average residence times of particulate 2 10 P o in the euphotic zone were-16.00 a to 1.54 a,which are higher than those of dissolved 2 10 Po(-6.89 a to-0.70 a). Great excesses of dissolved 210 Po were observed at all stations,with an average 2 10 Po/ 210 Pb ratio of 1.91±0.20,resulting from 2 10 Pb 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.
Fluxes of particulate organic carbon (POC) were derived from 2 10 Po / 210 Pb disequilibrium during the 4th Chinese National Arctic Research Expedition (CHINARE-4) from July 1 to September 28, 2010. Average residence times of particulate 2 10 P o in the euphotic zones were-16.00 a to 1.54 a, which are higher than those of dissolved 2 10 Po (-6.89 a to-0.70 a). Great excesses of dissolved 210 Po were observed at all stations, with an average 2 10 Po / 210 Pb ratio of 1.91 ± 0.20, resulting from 2 10 Pb 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. biological pumping in the Chukchi Sea. The results can improve understanding of the carbon cycle in the wes tern Arctic Ocean.