A cobalt plume in the oxygen minimum zone of the Eastern Tropical South Pacific
A cobalt plume in the oxygen minimum zone of the Eastern Tropical South Pacific
复制标题
南太平洋热带东部最低含氧区的钴羽流
DOI：
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复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Saito
中科院分区：
文献类型：
--
作者：
N. Hawco;D. Ohnemus;J. Resing;B. Twining;M. Saito
钴是浮游植物的营养物，但关于其生物地球化学循环的知识有限，特别是在太平洋。在这里，我们报告部分溶解钴和不稳定的36钴从美国GEOTRACES GP16样带在南太平洋。钴的分布37与南太平洋东部最低含氧区的范围和强度密切相关，38在靠近秘鲁边缘的氧跃层测得的浓度最高。在200米以下，39矿化和循环在钴和溶解氧之间产生反向关系，延伸到整个盆地。在氧气最小区域内，升高的41浓度的不稳定钴是由来自沿海来源的输入产生的，并且在低O2下减少42清除。当这些高钴沃茨涌上来并平流到近海时，浮游植物将钴输出返回到下面的低氧水体中。西部的秘鲁44上升流区，溶解钴小于10 pM的真光层，并强烈绑定45有机配体。由于南太平洋环流内的钴营养斜带比北大西洋和南大西洋中的贫营养区深，因此参与维持环流中的浮游植物47生产力的钴被大量再循环，并最终从东边缘的上涌沃茨的横向运输到达。与大量的沿海输入相比，东太平洋海隆沿着的热液喷口49似乎是钴的次要来源。总的来说，这些结果50表明氧的化学平衡对钴循环产生强烈的影响。51 52
Cobalt is a nutrient to phytoplankton, but knowledge about its biogeochemical cycling 35 is limited, especially in the Pacific Ocean. Here, we report sections of dissolved cobalt and labile 36 cobalt from the US GEOTRACES GP16 transect in the South Pacific. The cobalt distribution is 37 closely tied to the extent and intensity of the oxygen minimum zone in the eastern South Pacific 38 with highest concentrations measured at the oxycline near the Peru margin. Below 200 m, 39 remineralization and circulation produce an inverse relationship between cobalt and dissolved 40 oxygen that extends throughout the basin. Within the oxygen minimum zone, elevated 41 concentrations of labile cobalt are generated by input from coastal sources and reduced 42 scavenging at low O2. As these high cobalt waters are upwelled and advected offshore, 43 phytoplankton export returns cobalt to low-oxygen water masses underneath. West of the Peru 44 upwelling region, dissolved cobalt is less than 10 pM in the euphotic zone and strongly bound by 45 organic ligands. Because the cobalt nutricline within the South Pacific gyre is deeper than 46 oligotrophic regions in the North and South Atlantic, cobalt involved in sustaining phytoplankton 47 productivity in the gyre is heavily recycled and ultimately arrives from lateral transport of 48 upwelled waters from the eastern margin. In contrast to large coastal inputs, hydrothermal vents 49 along the Eastern Pacific Rise appear to be a minor source of cobalt. Overall, these results 50 demonstrate that oxygen biogeochemistry exerts a strong influence on cobalt cycling. 51 52
影响因子：
18.3
作者：
F. Scholz;J. McManus;A. Mix;C. Hensen;R. Schneider
通讯作者：
F. Scholz;J. McManus;A. Mix;C. Hensen;R. Schneider
钴和海洋氧化还原演化
影响因子：
5.3
作者：
Swanner;Planavsky;Lalonde;Robbins;Bekker;Rouxel;Kappler;Mojzsis;Konhauser
通讯作者：
Konhauser
影响因子：
56.9
作者：
Stramma, Lothar;Johnson, Gregory C.;Mohrholz, Volker
通讯作者：
Mohrholz, Volker