Processes controlling the distributions of Cd and PO4 in the ocean
Processes controlling the distributions of Cd and PO4 in the ocean
复制标题
控制海洋中 Cd 和 PO4 分布的过程
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. Morton
中科院分区：
文献类型：
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作者：
P. Quay;J. Cullen;W. Landing;P. Morton
从全球数据汇编的溶解Cd和PO 4的深度剖面被用来推导从表层输出的颗粒物的Cd/P，结果表明北大西洋的最低值（0.17 ± 0.05），南部最高（0.56 ± 0.24），南印度洋（0.31 ± 0.14）和北太平洋（0.36 ± 0.08）居中。高营养-低叶绿素（HNLC）区域输出颗粒的Cd/P是非HNLC区域输出颗粒的两倍，这是Cd和PO 4生物吸收过程中的分馏效应，这些趋势主要决定了在海洋表面观察到的溶解Cd/PO 4的空间趋势。在深层沃茨中，北大西洋的溶解Cd/PO_4最低，为0.23 ± 0.07，这主要是由于北大西洋深层水的Cd/PO_4较低（0.23）所致。而南大洋深层沃茨的溶解态Cd/PO 4（0.30 ± 0.06）明显高于大洋，这是由于南太平洋和南印度洋深层海水上升流的Cd/PO 4（0.28）和颗粒物的高Cd/P所致。一个多箱模型，占颗粒降解和温盐循环在深海产量溶解镉和PO 4流域间的趋势接近观测的影响。模型实验表明，在南大洋的HNLC条件的程度上的深海溶解的Cd/PO 4的依赖性和重建古PO 4浓度从镉代理的影响。
Depth profiles of dissolved Cd and PO4 from a global data compilation were used to derive the Cd/P of particles exported from the surface layer, and the results indicate lowest values in the North Atlantic (0.17 ± 0.05), highest in the Southern (0.56 ± 0.24), and intermediate in the South Indian (0.31 ± 0.14) and North Pacific (0.36 ± 0.08) Ocean basins. The Cd/P of exported particles in high nutrient‐low chlorophyll (HNLC) regions is twice that for particles exported in non‐HNLC regions as is the fractionation effect during biological uptake of Cd and PO4, and these trends primarily determine the spatial trends of dissolved Cd/PO4 observed in the surface ocean. In deep waters the lowest dissolved Cd/PO4 of 0.23 ± 0.07 is found in the North Atlantic Ocean and the result primarily of low Cd/PO4 of North Atlantic Deep Water (0.23). In contrast, deep waters in the Southern Ocean have significantly higher dissolved Cd/PO4 (0.30 ± 0.06), which is a result of the Cd/PO4 of upwelled deep water from the South Pacific and South Indian (0.28) and the high Cd/P of degrading particles. A multibox model that accounts for the impacts of particle degradation and thermohaline circulation in the deep sea yields dissolved Cd and PO4 interbasin trends close to observations. Model experiments illustrate the dependence of the dissolved Cd/PO4 of the deep sea on the extent of HNLC conditions in the Southern Ocean and the impact on reconstructing paleo PO4 concentrations from a Cd proxy.