Biological uptake and reversible scavenging of zinc in the global ocean
Biological uptake and reversible scavenging of zinc in the global ocean
复制标题
DOI：
10.1126/science.aap8532
复制
发表时间：
2018-07-06
期刊：
影响因子：
56.9
通讯作者：
DeVries, Tim
中科院分区：
文献类型：
--
作者：
Weber, Thomas;John, Seth;DeVries, Tim
锌 (Zn) 是海洋浮游植物的关键微量营养素，其全球分布与硅酸相似。尽管锌和二氧化硅的生物循环截然不同，但控制这种关系的过程仍然知之甚少。在这里，我们使用诊断和机制模型来表明，只有南大洋生物吸收和下沉颗粒上锌的可逆清除相结合才能解释观测结果。有机锌和吸附锌之间的区别也可以协调锌同位素的垂直分布和质量平衡，这在以前是不一致的。这种整体理解解释了在整个低纬度海洋中观察到的锌缺乏现象，并意味着海洋锌循环对气候驱动的有机物循环变化的敏感性比以前认识的更高。
Zinc (Zn) is a key micronutrient for marine phytoplankton, with a global distribution that is similar to silicic acid. The processes that govern this relationship, despite the very different biological cycling of Zn and silica, remain poorly understood. Here, we use diagnostic and mechanistic models to show that only a combination of Southern Ocean biological uptake and reversible scavenging of Zn onto sinking particles can explain the observations. The distinction between organic and adsorbed Zn can also reconcile the vertical distribution and mass balance of Zn isotopes, which previously appeared at odds. This holistic understanding explains the Zn deficiencies observed throughout the low-latitude ocean and implies a greater sensitivity of the marine Zn cycle to climate-driven changes in organic matter cycling than previously recognized.