| YANG Weifeng,CHEN Min,CAO Jianping,QIU Yusheng,ZHANG Run,MA Qiang,TONG Jinlu,YANG Junhong,YANG Zhi,LÜ E. 2009. Influence of particle composition on thorium scavenging in the marginal China seas. Acta Oceanologica Sinica, (2):45－53 |
| Influence of particle composition on thorium scavenging in the marginal China seas |
| Influence of particle composition on thorium scavenging in the marginal China seas |
| Received:August 23, 2007 Revised:January 02, 2008 |
| DOI： |
| Key words:POC biogenic silica thorium carbonate particle composition |
| 中文关键词: POC biogenic silica thorium carbonate particle composition |
| 基金项目:The National Natural Science Foundation of China under contract Nos 40606022 and 90411016; the National Key Basic Research Special Foundation Program of China under contract No. 2005CB422305. |
| Author Name | Affiliation | E-mail | | YANG Weifeng | Department of Oceanography, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | CHEN Min | Department of Oceanography, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | mchen@xmu.edu.cn | | CAO Jianping | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | QIU Yusheng | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | ZHANG Run | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | MA Qiang | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | TONG Jinlu | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | YANG Junhong | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | YANG Zhi | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | LÜ E | Department of Oceanography, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| Thorium-234 and particle composition (organic matter, biogenic silica, carbonate and lithogenic component) were examined in the East China Sea (ECS) and the northern South China Sea (NSCS) in order to constrain the particle types scavenging thorium isotopes. Good positive correlations between particulate organic matter (POM) or carbonate and thorium-234 in suspended particulate matter (SPM) indicates that POM and carbonate are efficient to scavenge thorium-234. No relationship between biogenic silica and thorium-234 suggests that geochemical behavior of thorium-234 may be not influenced by biogenic silica. A simple model was used to evaluate the affinity of thorium-234 to different particle components. The results show that POM is the most efficient scavenger for thorium-234 in the ECS and the NSCS, followed by carbonate. The authors' results lend support to the utility of thorium-234 as a proxy of POC and carbonate in the upper layer. However, the strong dependence of thorium scavenging on particle composition challenges thorium-230 as a constant flux proxy. |
| 中文摘要: |
| Thorium-234 and particle composition (organic matter, biogenic silica, carbonate and lithogenic component) were examined in the East China Sea (ECS) and the northern South China Sea (NSCS) in order to constrain the particle types scavenging thorium isotopes. Good positive correlations between particulate organic matter (POM) or carbonate and thorium-234 in suspended particulate matter (SPM) indicates that POM and carbonate are efficient to scavenge thorium-234. No relationship between biogenic silica and thorium-234 suggests that geochemical behavior of thorium-234 may be not influenced by biogenic silica. A simple model was used to evaluate the affinity of thorium-234 to different particle components. The results show that POM is the most efficient scavenger for thorium-234 in the ECS and the NSCS, followed by carbonate. The authors' results lend support to the utility of thorium-234 as a proxy of POC and carbonate in the upper layer. However, the strong dependence of thorium scavenging on particle composition challenges thorium-230 as a constant flux proxy. |
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