中文摘要：

在不冰冻的西方的北极海洋(Chukchi 海和加拿大盆) 联合上面的 ocean-benthic 碳动力学用自然马厩在晚 7 月早的 2003 年 9 月期间被评估(¹³ C ) 并且放射性(²³⁸U-²³⁴ Th ) 同位素 tracers。从 ²³⁴Th/ ²³⁸ U disequilibria 和溶解公司₂集中([公司₂(aq)])指出在 Chukchi 架中的加强的生物的泵显著地降低了[公司₂(aq)]并且改变了大小同位素( ¹²C/ ¹³ C )分别在碳固定期间在表面海洋。进一步， ¹³ 表面沉积的 C 签名(¹³ C _sed ) 断然加权的 ¹³ C _{在上面的海洋的停靠港} (¹³ C _sed =13.64+1.56 ????? à

英文摘要：

The coupling of upper ocean-benthic carbon dynamics in the ice-free western Arctic Ocean （the Chukchi Sea and the Canada Basin） was evaluated during the late July-early September 2003 using natural stable （13C） and radioactive （238U-234Th） isotope tracers. POC export flux estimated from 234Th/238U disequilibria and dissolved CO2 concentration （[CO2（aq）]） pointed out that the strengthened biological pump in the Chukchi Shelf have significantly lowered [CO2（aq）] and altered the magnitude of isotopic （12C/13C） fractionation during carbon fixation in the surface ocean. Further, δ13C signatures of surface sediments （δ13Csed） are positively correlated to those of weighted δ13Cp0C in upper ocean （δ13Csed =13.64＋1.56xδ13Cpoc, r2=0.73, p〈0.01）, suggesting that the POC isotopic signals from upper ocean have been recorded in the sediments, partly due to the rapid export of particles as evidenced by low residence times of the highly particle-reactive 234Th from the upper water column. It is suggested that there probably exists an upper ocean-benthic coupling of carbon dynamics, which likely assures the sedimentary δ13C record an indicator of paleo-CO2 in the western Arctic Ocean.