Particulate organic carbon export fluxes and validation of steady state model of 234Th export in the Chukchi Sea

摘要：

　　To evaluate the efficiency of biological pump and carbon sequestration content on Arctic shelf,estimations of POC export fluxes derived from 234Th/238U disequilibrium were made during the 3rd Chinese National Arctic Research Expedition (CHINARE-3) from July 12 to September 22,2008.The 234Th analysis was based on small volume MnO2 co-precipitation and β-counting method.Great deficits of 234Th to 238U were observed widely over Chukchi shelf,with an average 234Th/238U activity ratio of 0.64±0.28,resulting from intense particle scavenging.The average POC export fluxes in the entire study area,shelf and slope area were 24.9±23.3,29.5±23.0 and 2.1±0.5 mmol C m?2 d?1,respectively,resulting in that 21%of the primary production on average was exported to the benthos.Comparing with steady state model,non-steady-state model was recommended to derive a more accurate particulate 234Th export flux in a rapidly changing environment in the high latitude areas.

关键词： POC export flux Organic carbon burial rate 234Th/238U disequilibrium Non-steady-state model

作者: W.Yu J.He Y.Lia W.Lin L.Chen

作者单位: Third Institute of Oceanography,State Oceanic Administration,Xiamen 361005,China Key Laboratory of Global Change and Marine-Atmospheric Chemistry,State Oceanic Administration,,Xiame Key Laboratory of Global Change and Marine-Atmospheric Chemistry,State Oceanic Administration,,Xiame

会议类型: 国内会议

会议名称: 福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会分会场

会议地点: 福建平潭

会议语种:英文

页码: 661-676

在线出版日期: 2014-09-01（万方平台首次上网日期，不代表论文的发表时间）