Dissolved silicon isotopic compositions in the East China Sea: Water mass mixing vs. biological fractionation
Dissolved silicon isotopic compositions in the East China Sea: Water mass mixing vs. biological fractionation
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东海溶解硅同位素组成：水团混合与生物分馏
DOI：
10.1002/lno.10124
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发表时间：
2014-12
影响因子：
4.5
通讯作者：
Dai, Minhan
中科院分区：
文献类型：
--
作者：
Cao, Zhimian;Frank, Martin;Dai, Minhan
本文首次报道了中国东海海水中溶解硅同位素（δ30SiSi(OH)4）的数据。中国东海是一个受黑潮和长江淡水输入影响较大的大型边缘海。夏季（2009年8月），长江稀释水近岸地区地表δ30SiSi(OH)4最低值为+2.1‰，对应最高Si(OH)4浓度（~ 30.0µmol L−1）。在东海内陆架平流过程中，海面δ30SiSi(OH)4迅速上升至+3.2‰，同时Si(OH)4逐渐枯竭，表明生物对来自长江稀释水的Si(OH)4的利用增加。这也反映在东海中陆架和陆坡的水柱剖面上，δ30SiSi(OH)4随深度普遍减小，Si(OH)4随深度增大。冬季（2009年12月- 2010年1月），东海陆架近近海水柱δ30SiSi(OH)4基本稳定在+1.9‰，这是黑潮地下水垂直混合增强的结果。黑潮地表水的水平混合仅在陆架断裂之外被观察到，其中Si同位素高度分馏。在长江稀释水影响区外的东海陆架表层水体中，δ30SiSi(OH)4的季节差异显著，冬季比夏季低~ 1.0‰，尽管两个季节黑潮地下水的原生Si(OH)4供应相同。这表明夏季对Si(OH)4的生物消耗和利用明显高于冬季。
We present the first set of dissolved silicon isotope data in seawater (δ30SiSi(OH)4) from the East China Sea, a large and productive marginal sea significantly influenced by the Kuroshio Current and freshwater inputs from the Changjiang (Yangtze River). In summer (August 2009), the lowest surface δ30SiSi(OH)4 signatures of +2.1‰ corresponding to the highest Si(OH)4 concentrations (∼30.0 µmol L−1) were observed nearshore in Changjiang Diluted Water. During advection on the East China Sea inner shelf, surface δ30SiSi(OH)4 increased rapidly to +3.2‰ while Si(OH)4 became depleted, indicating increasing biological utilization of the Si(OH)4 originating from the Changjiang Diluted Water. This is also reflected in the water column profiles characterized by a general decrease of δ30SiSi(OH)4 and an increase of Si(OH)4 with depth on the East China Sea mid‐shelf and slope. In winter (December 2009–January 2010), however, the δ30SiSi(OH)4 was nearly constant at +1.9‰ throughout the water column on the East China Sea shelf beyond the nearshore, which was a consequence of enhanced vertical mixing of the Kuroshio subsurface water. Horizontal admixture of Kuroshio surface water, which is highly fractionated in Si isotopes, was observed only beyond the shelf break. Significant seasonal differences in δ30SiSi(OH)4 were detected in the surface waters beyond the Changjiang Diluted Water‐influenced region on the East China Sea shelf, where the winter values were ∼1.0‰ lower than those in summer, despite the same primary Si(OH)4 supply from the Kuroshio subsurface water during both seasons. This demonstrates significantly higher biological consumption and utilization of Si(OH)4 in summer than in winter.
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影响因子：
2.5
作者：
Kuo-Ping Chiang;Yingbin Chen;G. Gong
通讯作者：
Kuo-Ping Chiang;Yingbin Chen;G. Gong
DOI：
10.1016/s0967-0645(03)00010-9
发表时间：
2003-03
影响因子：
3
作者：
Hung-Jen Lee;S. Chao
通讯作者：
Hung-Jen Lee;S. Chao
影响因子：
4.1
作者：
T. Suga;A. Kato;K. Hanawa
通讯作者：
T. Suga;A. Kato;K. Hanawa
影响因子：
2.3
作者：
Kuo-Ping Chiang;Yun-Hsuan Chou;Jeng Chang;G. Gong
通讯作者：
Kuo-Ping Chiang;Yun-Hsuan Chou;Jeng Chang;G. Gong
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
D. Sigman;K. Karsh;K. Casciotti
通讯作者：
D. Sigman;K. Karsh;K. Casciotti