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学科主题: Oceanography
题名: A high-resolution study of particle export in the southern South China Sea based on Th-234 : U-238 disequilibrium
作者: Cai, PH ; Chen, WF ; Dai, MH ; Wan, ZW ; Wang, DX ; Li, Q ; Tang, TT ; Lv, DW
通讯作者: mdai@xmu.edu.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2008-01-01
卷: 113, 期:C4, 页:-
收录类别: sci
部门归属: [Cai, Pinghe; Chen, Weifang; Dai, Minhan; Wan, Zhenwen; Li, Qing; Tang, Tiantian; Lv, Dongwei] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China; [Wang, Dongxiao] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou, Peoples R China
项目归属: LED
摘要: During a spring intermonsoon cruise in 2004, depth profiles of total and particulate Th-234 in the upper 100 m were collected at 36 stations in the southern South China Sea (SCS), covering a surface area of similar to 1.0 x 10(6) km(2). Thorium-234 was sampled by using a modified small-volume MnO2 co-precipitation technique, which allows mapping the Th-234 distribution with a high spatial resolution. A stratified structure of Th-234/U-238 disequilibria was generally observed in the upper 100 m water column, suggesting that the euphotic zone of the southern SCS in this season can be separated into two layers: an upper layer with low export production rates and a lower layer with high export production rates. At the same time, we observed extensive zones of Th-234 excess within the euphotic layer, which is possibly due to intense remineralization of particulate matter. Particulate organic carbon (POC) export was estimated from a three-dimensional steady state model of Th-234 fluxes combined with measurements of the POC/Th-234 ratio on suspended particles. The POC export for this region varied from a low of -10.7 +/- 1.5 mmolC m(-2) d(-1) to a high of 12.6 +/- 1.1 mmolC m(-2) d(-1), with an average of 3.8 +/- 4.0 mmolC m(-2) d(-1). A negative flux of POC export is interpreted as the result of lateral input of particulate matter from nearby waters. Regional patterns in POC export show enhanced fluxes along the western and southern boundaries of the study region, and a "tongue'' of low export extending northwestward from similar to 7 degrees N 116 degrees E to similar to 10 degrees N 111 degrees E. This geographic distribution is consistent with the overall surface circulation pattern of the southern SCS in this season.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6027
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Cai, PH; Chen, WF; Dai, MH; Wan, ZW; Wang, DX; Li, Q; Tang, TT; Lv, DW.A high-resolution study of particle export in the southern South China Sea based on Th-234 : U-238 disequilibrium,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2008,113(C4):-
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