Vertical redistribution of salt and layered changes in global ocean salinity
Vertical redistribution of salt and layered changes in global ocean salinity
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DOI：
10.1038/s41467-019-11436-x
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发表时间：
2019-08
影响因子：
16.6
通讯作者：
Chao Liu;Xin‐Zhong Liang;R. Ponte;N. Vinogradova;O. Wang
中科院分区：
文献类型：
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作者：
Chao Liu;Xin‐Zhong Liang;R. Ponte;N. Vinogradova;O. Wang
盐度是估算全球流入海洋的净淡水的重要指标。由于现有盐度测量的空间和时间覆盖范围有限，以前对全球盐度变化的研究主要集中在表层和上层海洋。在这里，我们在一个动态一致和数据受限的海洋状态估计中检查全球海洋盐度变化和全深度的海洋垂直盐通量。水平平均盐度的变化表现为垂直分层结构，与海洋垂直盐分通量的剖面相一致。对于相对观测较好的上层海洋的盐度变化，盐分垂直交换的贡献可以与净地表淡水输入的贡献在同一量级。因此，在根据表层和上层海洋的测量结果推断全球海洋盐度和水文循环的变化时，应考虑盐的垂直再分布。
Salinity is an essential proxy for estimating the global net freshwater input into the ocean. Due to the limited spatial and temporal coverage of the existing salinity measurements, previous studies of global salinity changes focused mostly on the surface and upper oceans. Here, we examine global ocean salinity changes and ocean vertical salt fluxes over the full depth in a dynamically consistent and data-constrained ocean state estimate. The changes of the horizontally averaged salinity display a vertically layered structure, consistent with the profiles of the ocean vertical salt fluxes. For salinity changes in the relatively well-observed upper ocean, the contribution of vertical exchange of salt can be on the same order of the net surface freshwater input. The vertical redistribution of salt thus should be considered in inferring changes in global ocean salinity and the hydrological cycle from the surface and upper ocean measurements.