极地研究

极地研究 ›› 2009, Vol. 20 ›› Issue (1-English): 57-63.

• 研究论文 • 上一篇    下一篇

Preliminary study on particulate organic carbon export fluxes in the Bering Sea

 Ma Hao1,2, Zeng Zhi1, He Jianhua2, Yin Mingduan3, Chen Liqi2 and Zeng Shi1   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China
  • 出版日期:1959-03-30 发布日期:1959-03-30
  • 通讯作者: Ma Hao

Preliminary study on particulate organic carbon export fluxes in the Bering Sea

 Ma Hao1,2, Zeng Zhi1, He Jianhua2, Yin Mingduan3, Chen Liqi2 and Zeng Shi1   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China
  • Online:1959-03-30 Published:1959-03-30
  • Contact: Ma Hao

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摘要：

During the Second Chinese National Arctic Expedition (CHINARE) from July to September 2003, depth profiles of dissolved and particulate 234Th in upperwater columns were collected at two stations of BR03 and BR24 in the Bering Sea. 234Th was sampled by using a traditional Fe(OH)3 co-precipitation technique, which is a reliable approach to 234Th measurement. We observed 234Th excess at station BR03 below the euphotic zone, which was possibly due to the intensive remineralization of particulatematter. Particulate organic carbon ( POC ) export fluxes were estmiated from a one-dmiensional irreversible steady state model of 234Th fluxes together with measurements o f the POC/234Th ratio on the suspended particles. The POC export fluxes from the euphotic zone were 11. 66 and 11. 69 mmol C m-2 d-1 at BR03 and BR24 stations, respectively. The ratios of POC fluxes to prmiary production at the two stations were about 0. 5 and 0. 59, respectively, probably due to the presence of large phytoplankton ( in particular diatoms) .

关键词: 234Th /238U disequilibria, euphotic zone, particulate organic carbon, Bering Sea

Abstract:

During the Second Chinese National Arctic Expedition (CHINARE) from July to September 2003, depth profiles of dissolved and particulate 234Th in upperwater columns were collected at two stations of BR03 and BR24 in the Bering Sea. 234Th was sampled by using a traditional Fe(OH)3 co-precipitation technique, which is a reliable approach to 234Th measurement. We observed 234Th excess at station BR03 below the euphotic zone, which was possibly due to the intensive remineralization of particulatematter. Particulate organic carbon ( POC ) export fluxes were estmiated from a one-dmiensional irreversible steady state model of 234Th fluxes together with measurements o f the POC/234Th ratio on the suspended particles. The POC export fluxes from the euphotic zone were 11. 66 and 11. 69 mmol C m-2 d-1 at BR03 and BR24 stations, respectively. The ratios of POC fluxes to prmiary production at the two stations were about 0. 5 and 0. 59, respectively, probably due to the presence of large phytoplankton ( in particular diatoms) .

Key words: 234Th /238U disequilibria, euphotic zone, particulate organic carbon, Bering Sea