The estimates of the particulate organic carbon export fluxes in Prydz Bay, Southern Ocean using <sup>234</sup>Th/<sup>238</sup>U disequilibria

HE Jian-hua; MA Hao; CHEN Li-qi; XIANG Bao-qiang; ZENG Xian-zhang; YIN Ming-duan; ZENG Wen-yi

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HE Jian-hua, MA Hao, CHEN Li-qi, XIANG Bao-qiang, ZENG Xian-zhang, YIN Ming-duan, ZENG Wen-yi. The estimates of the particulate organic carbon export fluxes in Prydz Bay, Southern Ocean using 234Th/238U disequilibria[J]. Haiyang Xuebao, 2007, 29(4): 69-76.

Citation:

HE Jian-hua, MA Hao, CHEN Li-qi, XIANG Bao-qiang, ZENG Xian-zhang, YIN Ming-duan, ZENG Wen-yi. The estimates of the particulate organic carbon export fluxes in Prydz Bay, Southern Ocean using ²³⁴Th/²³⁸U disequilibria[J]. Haiyang Xuebao, 2007, 29(4): 69-76.

Citation:

HE Jian-hua, MA Hao, CHEN Li-qi, XIANG Bao-qiang, ZENG Xian-zhang, YIN Ming-duan, ZENG Wen-yi. The estimates of the particulate organic carbon export fluxes in Prydz Bay, Southern Ocean using ²³⁴Th/²³⁸U disequilibria[J]. Haiyang Xuebao, 2007, 29(4): 69-76.

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The estimates of the particulate organic carbon export fluxes in Prydz Bay, Southern Ocean using ²³⁴Th/²³⁸U disequilibria

1.
Key Lab of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
Key Lab of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Department of Engineering Physics Tsinghua University, Beijing 100084, China
3.
Key Lab of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Ocenic Administration, Qingdao 266061, China

Received Date: 2006-12-24
Rev Recd Date: 2007-02-09

Abstract

Abstract

Dissolved and particulate ²³⁴Th,particulate organic carbon in the upper 150 m of water columns from five stations in the Prydz Bay,Southern Ocean were determined during the 22nd Chinese National Antarctic Research Expedition(from Nov.2005 to Mar.2006).The disequilibria between ²³⁴Th and its parent ²³⁸U in upper layer was used to derive the average residence time of ²³⁴Th,which decreased along with the latitude toward south with minimum values,respectively 1~8 d for particulate ²³⁴Th and 29~48 d for dissolved ²³⁴Th,appeared at the medium latitude station,and the export fluxes of ²³⁴Th were calculated too and max values,respectively 21~38 dpm/(m²·d)for particulate ²³⁴Th and 26~39 dpm/(m²·d) for dissolved ²³⁴Th,appeared at the same station.The export fluxes of particulate organic carbon at different water columns were derived by two methods with irreversible scavenging model,and the average value were 104.7 mmol/(m²·d)(E method)and 120.6 mmol/(m²·d)(B method),respectively,which meant in summer relatively high new production existed in the Prydz Bay where would play a significant role as CO₂ sink.
- POC fluxes,
- ²³⁴Th/²³⁸U disequilibria,
- Prydz Bay,
- Southern Ocean

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References(36)

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