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Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria

MA Hao ZENG Zhi HE Jianhua CHEN Liqi YIN Mingduan ZENG Shi ZENG Wenyi

中国海洋湖沼学报(英文版)2008，Vol.26Issue(4)：480-485,6.
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中国海洋湖沼学报(英文版)2008，Vol.26Issue(4)：480-485,6.DOI:10.1007/s00343-008-0480-y

Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria

Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria

MA Hao 1ZENG Zhi 2HE Jianhua 3CHEN Liqi 4YIN Mingduan 1ZENG Shi 2ZENG Wenyi1

作者信息

  • 1. Key Laboratory of Global Change and Marine-Atmospheric Chemistry (GCMAC), State Oceanic Administration, Xiamen 361005, China
  • 2. Third Institute of Oceanography. State Oceanic Administration, Xiamen 361005, China
  • 3. Department of Engineering Physics, Tsinghua Un
  • 4. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 折叠

摘要

Abstract

234Th-238u disequilibria were applied to examine the particle dynamics in the euphotic zone of the central South China Sea during the spring 2002 cruise. The particulate organic carbon (POC), 234Th (including both dissolved and particulate) and 238U in the water column at three stations were determined. The profiles of 234Th/238U activity ratio at the three stations all showed consistent 234Th deficit as compared to 238U in the upper 100 m water column. Based on the profiles of the dissolved and particulate 234Th and a steady state box model, the dissolved 234Th scavenging rates, the particulate 234Th removal rates and their resident times were quantified. It was found that the POC downward export fluxes out of the upper 100 m euphotic zone ranged from 9.40 to 14.78 mmol.m-2.d-1. The results from this study provide new information for our understanding of carbon biogeochemical cycle in the South China Sea.

关键词

234Th-238U disequilibria/POC export flux/Euphotic zone/South China Sea

Key words

234Th-238U disequilibria/POC export flux/Euphotic zone/South China Sea

分类

天文与地球科学

引用本文复制引用

MA Hao ,ZENG Zhi,HE Jianhua,CHEN Liqi,YIN Mingduan,ZENG Shi,ZENG Wenyi..Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria[J].中国海洋湖沼学报(英文版),2008,26(4):480-485,6.

基金项目

the NSFC (key program No. 40531007) and general Programs (No. 40406014, 40276001 and 10705019), the State Social Commonweal Grant (No. 2004DIB5178), and the commonweal project sponsored by the Scientific Research Foundation of the Ministry of China(No.2007050228)and Chinese IPY Campaing found by MOF （key program No. 40531007）

中国海洋湖沼学报(英文版)

OACSCDCSTPCD

2096-5508

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