Quantifying Atmospheric Trace Element Deposition Over the Ocean on a Global Scale With Satellite Rainfall Products
Quantifying Atmospheric Trace Element Deposition Over the Ocean on a Global Scale With Satellite Rainfall Products
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DOI：
10.1029/2019gl086357
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发表时间：
2019-12
影响因子：
5.2
通讯作者：
D. Kadko;W. Landing;C. Buck
中科院分区：
文献类型：
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作者：
D. Kadko;W. Landing;C. Buck
大气向海洋输入的微量元素微量营养素很难确定，因为即使收集了高质量的气溶胶化学浓度，这些数据本身也无法得出沉积率。为了将这些浓度转化为速率，需要通过施加适当的沉积速度来确定通量的方法。最近开发的方法的基础上的天然放射性核素7Be提供了一种手段来估计散装（湿+干）的沉积速度（Vb）所需的这种计算。在这里，介绍了2018年美国GEOTRACES太平洋经向断面期间收集的水柱7Be库存和气溶胶7Be浓度。我们将这些数据与来自其他海洋盆地的数据结合起来，推导出降雨率（m/yr）和整体沉积速度（m/day）之间的全球关系，即Vb = 999 ± 96 ×降雨率+1，040 ± 136（R2 = 0.81）。因此，卫星派生的降雨量估计，一种方法来计算气溶胶的整体沉积速度提供。
Atmospheric input of trace element micronutrients to the oceans is difficult to determine, as even with collection of high‐quality aerosol chemical concentrations, such data by themselves cannot yield deposition rates. To transform these concentrations into rates, a method of determining flux by applying an appropriate deposition velocity is required. A recently developed method based on the natural radionuclide 7Be has provided a means to estimate the bulk (wet + dry) deposition velocity (Vb) required for this calculation. Here, water column 7Be inventories and aerosol 7Be concentrations collected during the 2018 US GEOTRACES Pacific Meridional Transect are presented. We use these data together with those from other ocean basins to derive a global relationship between rain rate (m/yr) and bulk deposition velocity (m/day), such that Vb = 999 ± 96 × Rain rate + 1,040 ± 136 (R2 = 0.81). Thus, with satellite‐derived rainfall estimates, a means to calculate aerosol bulk deposition velocities is provided.