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Particulate barium flux and its relationship with export production on the continental shelf of Prydz Bay, east Antarctica

【标题】Particulate barium flux and its relationship with export production on the continental shelf of Prydz Bay, east Antarctica

【Title】Particulate barium flux and its relationship with export production on the continental shelf of Prydz Bay, east Antarctica

【作者】 孙维萍; 韩正兵; C.Y. Hu; 潘建明

【Author】 Sun Weiping ; Han Zhengbing ; C.Y. Hu ; Pan Jianming

【期刊】Elsevier

【Journal】Elsevier

【期刊年份】2013

【卷】157

【期】86-92

【关键词】 Barium,Flux,Organic carbon,Export production,Continental shelf,Antarctica

【Keywords】 Barium,Flux,Organic carbon,Export production,Continental shelf,Antarctica

【摘要】Particulate barium fluxes on the continental shelf of Prydz Bay in east Antarctica were measured by using time series sediment trap deployed at two stations with trap depth about 500 m during 7/12/2009–15/2/2010 and 16/12/2010–16/12/2011. The annual fluxes were 12.3 mg m−2 yr−1 and 18.4 mg m−2 yr−1 for barium, and 8.9 mg m−2 yr−1 and 14.9 mg m−2 yr−1 for biogenic barium at two stations, respectively. More than 72% of the bariumis frombiogenic source. The temporal–spatial variations of biogenic bariumfluxes and the ratio of biogenic barium to organic carbon are related to the variation of organic matter export in the upper water column. Biogenic bariumflux and organic matter export are generally positive correlated. However, biogenic bariumprecipitation is less efficient under conditions of high organic matter exports during times of greater primary productivity, which leads to relatively less cycling of organic carbon and in turn produces less barite formation based on the hypothesis that barite forms through organic matter decomposing in microenvironment. More than 72% of the rained biogenic barium at the trap depth was preserved in the sediment. High preservation efficiency of biogenic barium and good relationship between biogenic barium and organic carbon suggested that biogenic barium could be a reliable proxy for the marine export production. The calculated export productions are 6.9 g C m−2 yr−1 and 14.9 g C m−2 yr−1 at two stations respectively using the modified prediction equation, which is more suitable for predicating export production for margin and shelf systems.

【Abstract】Particulate barium fluxes on the continental shelf of Prydz Bay in east Antarctica were measured by using time series sediment trap deployed at two stations with trap depth about 500 m during 7/12/2009–15/2/2010 and 16/12/2010–16/12/2011. The annual fluxes were 12.3 mg m−2 yr−1 and 18.4 mg m−2 yr−1 for barium, and 8.9 mg m−2 yr−1 and 14.9 mg m−2 yr−1 for biogenic barium at two stations, respectively. More than 72% of the bariumis frombiogenic source. The temporal–spatial variations of biogenic bariumfluxes and the ratio of biogenic barium to organic carbon are related to the variation of organic matter export in the upper water column. Biogenic bariumflux and organic matter export are generally positive correlated. However, biogenic bariumprecipitation is less efficient under conditions of high organic matter exports during times of greater primary productivity, which leads to relatively less cycling of organic carbon and in turn produces less barite formation based on the hypothesis that barite forms through organic matter decomposing in microenvironment. More than 72% of the rained biogenic barium at the trap depth was preserved in the sediment. High preservation efficiency of biogenic barium and good relationship between biogenic barium and organic carbon suggested that biogenic barium could be a reliable proxy for the marine export production. The calculated export productions are 6.9 g C m−2 yr−1 and 14.9 g C m−2 yr−1 at two stations respectively using the modified prediction equation, which is more suitable for predicating export production for margin and shelf systems.

【基金/项目】 南极普里兹湾微量元素沉积地层记录及其来源、通量和浮游植物群落的生态响应 ; 南极环境综合分析与评价 ; 极地对全球和我国气候变化影响的综合评价 ; 南极周边海域海洋化学与碳通量考察

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