<sup>234</sup>Th/<sup>238</sup>U disequilibrium and particulate organic carbon export in the northwestern South China Sea

MA Hao; ZENG Zhi; YU Wen; HE Jianhua; CHEN Liqi; CHENG Jianping; YIN Mingduan; ZENG Shi

doi:10.1007/s13131-011-0119-2

²³⁴Th/²³⁸U disequilibrium and particulate organic carbon export in the northwestern South China Sea

doi: 10.1007/s13131-011-0119-2

1.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China;Key Laboratory of Particle & Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China;Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense, Beijing 100084, China
2.
Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China
3.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China

基金项目: The National Natural Science Foundation of China under grant Nos 40531007, 40676062 and 10705019; the scientific research foundation of the Ministry of Science and Technology of China through commonweal grant No. 2007050228 and International Cooperation Program No. 2009DFA22920; Open Fund of the Key Laboratory of Global Change and MarineAtmospheric Chemistry, State Oceanic Administration under grant Nos 0807 and 0902; Tsinghua University Initiative Scientific Research Program.

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出版历程
- 收稿日期: 2010-07-16
- 修回日期: 2010-12-29

²³⁴Th/²³⁸U disequilibrium and particulate organic carbon export in the northwestern South China Sea

1.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China;Key Laboratory of Particle & Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China;Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense, Beijing 100084, China
2.
Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China
3.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China

摘要

摘要: ²³⁴Th was utilized as a tracer of particulate organic carbon (POC) export in the northwestern South China Sea (SCS) on the basis of the data collected at four stations during a spring cruise. Depth profiles of dissolved and particulate ²³⁴Th activities were measured in the upper 60 m, showing a significant deficit relative to ²³⁸U over the investigated stations. A stratified structure of ²³⁴Th-238 U disequilibrium was in general observed in the upper 60 m water column, indicating that the euphotic zone of the northwestern SCS in this reason can be divided into two layers, an upper and lower layer, with different export rates. POC export fluxes were estimated from a one-dimensional steady state model of ²³⁴Th fluxes in combination with the measurement of POC/²³⁴Th ratios on suspended particles. The POC export in this region ranged from 8.2 to 20.0 mmol/(m²·d), with an average of 16.0 mmol/(m²·d), and was slightly higher than those previously reported in the southern SCS.
- ²³⁴Th-²³⁸Udisequilibrium /
- POCexport /
- SouthChinaSea(SCS)
Abstract: ²³⁴Th was utilized as a tracer of particulate organic carbon (POC) export in the northwestern South China Sea (SCS) on the basis of the data collected at four stations during a spring cruise. Depth profiles of dissolved and particulate ²³⁴Th activities were measured in the upper 60 m, showing a significant deficit relative to ²³⁸U over the investigated stations. A stratified structure of ²³⁴Th-238 U disequilibrium was in general observed in the upper 60 m water column, indicating that the euphotic zone of the northwestern SCS in this reason can be divided into two layers, an upper and lower layer, with different export rates. POC export fluxes were estimated from a one-dimensional steady state model of ²³⁴Th fluxes in combination with the measurement of POC/²³⁴Th ratios on suspended particles. The POC export in this region ranged from 8.2 to 20.0 mmol/(m²·d), with an average of 16.0 mmol/(m²·d), and was slightly higher than those previously reported in the southern SCS.
- ²³⁴Th-²³⁸U disequilibrium /
- POC export /
- South China Sea (SCS)

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文章访问数: 348
HTML全文浏览量: 35
PDF下载量: 147
被引次数: 0

234Th/238U disequilibrium and particulate organic carbon export in the northwestern South China Sea

doi: 10.1007/s13131-011-0119-2

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出版历程

234Th/238U disequilibrium and particulate organic carbon export in the northwestern South China Sea

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²³⁴Th/²³⁸U disequilibrium and particulate organic carbon export in the northwestern South China Sea

²³⁴Th/²³⁸U disequilibrium and particulate organic carbon export in the northwestern South China Sea