Particulate organic carbon export fluxes on Chukchi Shelf,western Arctic Ocean,derived from ^(210)Po/^(210)Pb disequilibrium  

作　　者：何建华 余雯 林武辉 门武 陈立奇 

机构地区：[1]College of Oceanography and Environment Science, Xiamen University [2]Third Institute of Oceanography,State Oceanic Administration [3]Key Lab of Global Change and Marine-Atmospheric Chemistry,State Oceanic Administration [4]Key Lab of Global Change and Marine- Atmospheric Chemistry,State Oceanic Administration [5]Department of Engineering Physics, Tsinghua University

出　　处：《Chinese Journal of Oceanology and Limnology》2015年第3期741-747,共7页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.41106167,11205094,41230529,41476172,41406221,41476173);the Youth Foundation of State Oceanic Administration(No.2011531);the CHINARE2012-15 for 01-04-02,02-01,and 03-04-02

摘　　要：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 ^210Po 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 ^210Po were observed at all stations, with an average 210^Po/^210^Pb ratio of 1.91±0.20, resulting from 210^Pb atmospheric deposition after sea ice melt. POC fluxes from the euphoric zone were estimated by two methods （E and B） in the irreversible scavenging model. Estimated POC fluxes were 945-126 mmol C/（m^2·a）and 1 848-109 mmol C/（m^2·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 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.

关 键 词：particulate organic carbon （POC） flux ^210Po/^210Pb disequilibrium Chukchi Shelf 

分 类 号：P734[天文地球—海洋化学]