Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from Po-210/Pb-210 disequilibria

Disequilibria between Po-210 and Pb-210 in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean (station IV3) and the South China Sea (NS44). Po-210 was deficit in surface waters but excessive relative to Pb-210 in su...

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Bibliographic Details
Published in:Science Bulletin
Main Authors: Yang, WeiFeng, 杨伟锋, Huang, YiPu, 黄奕普, Chen, Min, 陈敏, Qiu, YuSheng, 邱雨生, Peng, AnGuo, 彭安国, Zhang, Lei
Format: Article in Journal/Newspaper
Language:English
Published: SCIENCE PRESS 2009
Subjects:
Po-210/Pb-210 disequilibria
POC
remineralization
Southern Ocean
South China Sea
Online Access:https://doi.org/10.1007/s11434-009-0043-4
http://dspace.xmu.edu.cn/handle/2288/8792
Description
Summary:Disequilibria between Po-210 and Pb-210 in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean (station IV3) and the South China Sea (NS44). Po-210 was deficit in surface waters but excessive relative to Pb-210 in subsurface waters. Good positive correlation between Po-210 and particulate organic carbon (POC) indicated deficits and excess of Po-210 resulted from particulate organic matter (POM) export and remineralization respectively, which was also supported by the decreased delta C-13 and increased delta N-15 downwards as a result of particle remineralization. On the basis of Po-210/Pb-210 box-model, POC export flux out of the surface waters were 1.2 mmol C center dot m(-2) center dot d(-1) and 2.3 mmol C center dot m(-2) center dot d(-1) for station NS44 and IV3, respectively. In the subsurface waters, remineralization fluxes of Po-210 were 0.062 Bq center dot m(-2) center dot d(-1) and 0.566 Bq center dot m(-2) center dot d(-1) for station NS44 and IV3 along with the recycle efficiency of 52 +/- 26% and 119 +/- 52%, respectively. Remineralized fluxes of POM derived from Po-210 and exported POC were 0.6 mmol C center dot m(-2) center dot d(-1) and 2.7 mmol C center dot m(-2) center dot d(-1) for NS44 and IV3. This study suggested that Po-210 was a powerful tracer of particle export and remineralization. National Natural Science Foundation of China [40576037, 90411016]; National Key Technology Research and Development Program [2006BAB19B03]; COMRA [DYXM-115-01-3-04]

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