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

Hao Ma; Zhi Zeng; Jianhua He; Liqi Chen; Mingduan Yin; Shi Zeng; Wenyi Zeng

doi:10.1007/s00343-008-0480-y

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

Updated：2023-05-16

- Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria
- Journal of Oceanology and Limnology Vol. 26, Issue 4, Pages: 480-485(2008)
- Affiliations：
  
  1. Key Laboratory of Global Change and Marine-Atmospheric Chemistry (GCMAC) State Oceanic Administration
  2. Third Institute of Oceanography State Oceanic Administration
  3. Department of Engineering Physics Tsinghua University
- Author bio：
- Funds：
- DOI：10.1007/s00343-008-0480-y
  CLC：
- Online First：23 January 2009，
  
  Published：2008
- Accepted：
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Ma, H., Zeng, Z., He, J. et al. Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria., Chin. J. Ocean. Limnol. 26, 480–485 (2008). https://doi.org/10.1007/s00343-008-0480-y
DOI：

Ma, H., Zeng, Z., He, J. et al. Vertical flux of particulate organic carbon in the central South China Sea estimated from 234Th-238U disequilibria., Chin. J. Ocean. Limnol. 26, 480–485 (2008). https://doi.org/10.1007/s00343-008-0480-y DOI：

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.

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references

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