Distributions of silicon isotopes of dissolved silicate in the surface seawater from global oceans
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摘要: 本文分析了采集自太平洋、印度洋和大西洋的表层海水溶解硅酸盐的δ30Si值，结果表明，太平洋表层海水的δ30Si值为0.45‰～2.91‰，平均值为(1.52±0.59)‰；印度洋表层海水的δ30Si值为0.98‰～2.30‰，平均值为(1.52±0.36)‰；大西洋表层海水的δ30Si值为0.90‰～2.23‰，其平均值为(1.55±0.35)‰。硅同位素在各大洋表层，主要表现出与大洋表层环流和经向翻转流的相关性，其分布特征受表层水体中的生物活动以及表层洋流运动导致的不同水团之间的混合的影响，且混合作用可能对开放大洋表层水体的δ30Si分布具有显著的影响。Abstract: We analyzed δ30Si of dissolved silicate of surface seawater from the Pacific Ocean, Indian Ocean and Atlantic Ocean. The results showed that the δ30Si of the Pacific Ocean surface seawater was 0.45‰−2.91‰, withan average value of (1.52±0.59)‰; the δ30Si of the Indian Ocean surface seawater was 0.98‰−2.30‰, with an average value of (1.52±0.36)‰; the δ30Si value of the Atlantic Ocean surface seawater was 0.90‰−2.23‰, the average value was (1.55±0.35)‰. The silicon isotope in the ocean surface layer mainly shows the correlation with the ocean surface circulation and meridional overturning current, and its distribution characteristics are mainly affected by the biological activities in the surface water and the mixing between different water masses caused by the movement of the surface ocean currents. The mixing effect perhaps has a significant effect on the distribution of δ30Si in the surface water of the open oceans.
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Key words:
- δ30Si /
- surface seawater /
- dissolved silicate /
- global oceans
1) 付锋. 溶解硅同位素在大洋中的分布. 杭州：自然资源部第二海洋研究所。 -
图 2 太平洋采样站位分布
底图为表层硅酸盐含量的年平均平面分布（数据来自WOA13，采用Ocean Data View 4.3绘制）
Fig. 2 Sampling stations in the Pacific Ocean
The background map shows annual average dissolved silicate content in the surface water (data from WOA13, plot is generated using Ocean Data View 4.3)
图 3 太平洋表层海水中溶解硅酸盐的δ30Si分布
Fig. 3 δ30Si dstribution of dissolved silicate in the surface seawater of the Pacific Ocean
图 4 太平洋表层海水δ30Si值的平面分布
东太平洋数据来自文献[4, 17−20]；西太平洋数据来自本文，表层环流引自文献[27]
Fig. 4 δ30Si distribution of dissolved silicate in the surface seawater of the Pacific Ocean
Data of eastern Pacific Ocean from references [4, 17−20], data of western Pacific Ocean from this study, surface currents from reference [27]
图 5 印度洋硅同位素采样站位
底图为表层硅酸盐含量的年平均平面分布（数据来自WOA13，采用Ocean Data View 4.3绘制）
Fig. 5 Sampling stations in the Indian Ocean
The background map shows annual average dissolved silicate content in the surface water (data from WOA13, plot is generated using Ocean Data View 4.3)
图 7 大西洋硅同位素采样站位
底图为表层硅酸盐含量的年平均平面分布（数据来自WOA13，采用Ocean Data View 4.3绘制）
Fig. 7 Sampling stations in the Atlantic Ocean
The background map shows annual average dissolved silicate content in the surface water (data from WOA13, plot is generated using Ocean Data View 4.3)
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