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楚科奇海颗粒有机碳输出通量及234Th稳态模型验证

【标题】楚科奇海颗粒有机碳输出通量及234Th稳态模型验证

【Title】Particulate organic carbon export fluxes and validation of steady state model of 234Th export in the Chukchi Sea

【DOI】10.1016/j.dsr2.2012.03.003

【作者】 余雯

【Author】 Yu Wen

【期刊】Deep-SeaResearch II

【Journal】Deep-SeaResearch II

【期刊年份】2012

【卷】81-84

【期】

【关键词】 POC export flux; Organic carbon burial rate; 234Th/238U disequilibrium; Non-steady-state model

【Keywords】 POC export flux; Organic carbon burial rate; 234Th/238U disequilibrium; Non-steady-state model

【摘要】

【Abstract】To evaluate the efficiency of biological pump and carbon sequestration content on Arctic shelf, estimations of POC export fluxes derived from 234Th/238U disequilibrium were made during the 3rd Chinese National Arctic Research Expedition (CHINARE-3) from July 12–September 22, 2008. The 234Th analysis was based on small volume MnO2 co-precipitation and β-counting method. Great deficits of 234Th to 238U were observed widely over Chukchi shelf, with an average 234Th/238U activity ratio of 0.64±0.28, resulting from intense particle scavenging. The average POC export fluxes in the entire study area, shelf and slope area were 24.9±23.3 mmol C m−2 d−1, 29.5±23.0 mmol C m−2 d−1 and 2.1±0.5 mmol C m−2 d−1, respectively, resulting in that 21% of the primary production on average was exported to the benthos. Comparison with steady state model, non-steady-state model was recommended to derive a more accurate particulate 234Th export flux in a rapidly changing environment in the high latitude areas.

【基金/项目】 白令海入流水对北冰洋生态系统及碳汇的影响研究

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