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Distributions of dissolve inorganic carbon and total alkalinity in the western Arctic Ocean

【标题】Distributions of dissolve inorganic carbon and total alkalinity in the western Arctic Ocean

【Title】Distributions of dissolve inorganic carbon and total alkalinity in the western Arctic Ocean

【作者】 孙恒; 高众勇; 陈立奇

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2011

【卷】22

【期】

【关键词】

【Keywords】 Dissolved inorganic carbon; total alkalinity; Western Arctic Ocean; distribution; controlling factors

【摘要】The 3rd Chinese National Arctic Research Expedition (CHINARE 2008) was carried out from July to September in 2008. During survey, a considerable number of sea water samples were taken for CO2 parameters measurements (including total alkalinity (TA), total dissolved inorganic carbon (DIC)).The distributions of CO2 parameters in the Western Arctic Ocean were determined, and the according controlling factors were discussed. The ranges of summertime TA, nTA, DIC and nDIC in the Western Arctic Ocean surface water were 1757-2229μmol kg-1, 2383-2722μmol kg-1, 1681-2034μmol, 2119-2600μmol kg-1, respectively. As a result of dilution from ice-melt water, the surface TA and DIC concentrations were rather low. TA from the upper 100m in the south of 78°N in the Western Arctic Ocean had a good correlation with salinity, showing a conservative behavior, and the distribution followed seawater-river mixing line at salinity > 30, then followed the mixing line of seawater (diluted by river water to salinity = 30) with the ice-melt water. The distribution of DIC in the Chukchi Sea was dominated by biological production or respiration of organic matter, whereas the conservative mixing dominated the distribution of TA of mixed layer in the ice-free Canada Basin.

【Abstract】The 3rd Chinese National Arctic Research Expedition (CHINARE 2008) was carried out from July to September in 2008. During survey, a considerable number of sea water samples were taken for CO2 parameters measurements (including total alkalinity (TA), total dissolved inorganic carbon (DIC)).The distributions of CO2 parameters in the Western Arctic Ocean were determined, and the according controlling factors were discussed. The ranges of summertime TA, nTA, DIC and nDIC in the Western Arctic Ocean surface water were 1757-2229μmol kg-1, 2383-2722μmol kg-1, 1681-2034μmol, 2119-2600μmol kg-1, respectively. As a result of dilution from ice-melt water, the surface TA and DIC concentrations were rather low. TA from the upper 100m in the south of 78°N in the Western Arctic Ocean had a good correlation with salinity, showing a conservative behavior, and the distribution followed seawater-river mixing line at salinity > 30, then followed the mixing line of seawater (diluted by river water to salinity = 30) with the ice-melt water. The distribution of DIC in the Chukchi Sea was dominated by biological production or respiration of organic matter, whereas the conservative mixing dominated the distribution of TA of mixed layer in the ice-free Canada Basin.

【基金/项目】 北极碳汇十年变化及其对北极海冰快速变化的响应 ; 夏季白令海二氧化碳体系关键问题研究 ; 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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