南大洋普里兹湾基于<sup>234</sup>Th/<sup>238</sup>U不平衡法的POC输出通量研究

何建华; 马豪; 陈立奇; 项宝强; 曾宪章; 尹明端; 曾文义

南大洋普里兹湾基于²³⁴Th/²³⁸U不平衡法的POC输出通量研究

1.
国家海洋局, 海洋-大气化学与全球变化重点实验室, 福建, 厦门, 361005;国家海洋局, 第三海洋研究所, 福建, 厦门, 361005
2.
国家海洋局, 海洋-大气化学与全球变化重点实验室, 福建, 厦门, 361005;国家海洋局, 第三海洋研究所, 福建, 厦门, 361005;清华大学, 工程物理系, 北京, 10084
3.
国家海洋局, 第一海洋研究所, 海洋科学与数值模拟重点实验室, 山东, 青岛, 266061

基金项目: 国家自然科学基金重点项目(40531007);国家自然科学基金项目(40406014;40276001);国家社会公益基金项目(2004DIB5178);福建省自然科学基金计划资助项目(2006J0287)

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- 收稿日期: 2006-12-24
- 修回日期: 2007-02-09

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

摘要

摘要: 中国第22次南极科学考察(2005年11月至2006年3月)期间,测定了南极普里兹湾海域5个站位的从表层至150 m水深的不同层位水样中溶解态和颗粒态²³⁴Th,²³⁸U的放射性比活度以及颗粒有机碳.利用²³⁴Th/²³⁸U在上层水体中的不平衡,计算了南极普里兹湾上层水体中²³⁴Th的平均停留时间和输出通量.结果显示,随着纬度的增加,上层水体中颗粒态和溶解态²³⁴Th的平均停留时间总体趋向减小,并在中纬度站位出现了最低值,分别为1~8和29~48 d,而颗粒态和溶解态²³⁴Th的输出通量则在中纬度站位出现了最大值,分别为21~38和26~39 dpm/(m³·d).运用箱型清除模式,利用两种不同的方法估算了各水柱中从真光层底部输出的POC通量,平均值分别达到104.7 mmol/(m²·d)(E法)和120.6 mmol/(m²·d)(B法),表明南极普里兹湾夏季存在很高的新生产力,它将会对该海域碳的生物泵过程产生重要作用.
- ²³⁴Th/²³⁸U不平衡法 /
- POC输出通量 /
- 普里兹湾 /
- 南大洋
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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参考文献(36)

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南大洋普里兹湾基于²³⁴Th/²³⁸U不平衡法的POC输出通量研究

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

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南大洋普里兹湾基于234Th/238U不平衡法的POC输出通量研究

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

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出版历程

目录

南大洋普里兹湾基于²³⁴Th/²³⁸U不平衡法的POC输出通量研究

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