| MA Hao,ZENG Zhi,YU Wen,HE Jianhua,CHEN Liqi,CHENG Jianping,YIN Mingduan,ZENG Shi. 2011. 234Th/238U disequilibrium and particulate organic carbon export in the northwestern South China Sea. Acta Oceanologica Sinica, (3):55－62 |
| 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 |
| Received:July 16, 2010 Revised:December 29, 2010 |
| DOI：10.1007/s13131-011-0119-2 |
| Key words:234Th-238U disequilibrium POC export South China Sea (SCS) |
| 中文关键词: 234Th-238U disequilibrium POC export South China Sea (SCS) |
| 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. |
| Author Name | Affiliation | E-mail | | MA Hao | 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 | | | ZENG Zhi | 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 | | | YU Wen | Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China | | | HE Jianhua | Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China | | | CHEN Liqi | Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China | lqchen@soa.gov.cn | | CHENG Jianping | 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 | | | YIN Mingduan | Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China | | | ZENG Shi | Department of Engineering Physics, Tsinghua University, Beijing 100084, China | |
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| 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. |
| 中文摘要: |
| 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. |
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