4.6 Article

Influence of Nonseasonal River Discharge on Sea Surface Salinity and Height

出版社

AMER GEOPHYSICAL UNION
DOI: 10.1029/2021MS002715

关键词

river discharge; sea surface salinity; sea surface height

资金

  1. National Aeronautics and Space Administration [80NM0018D0004]

向作者/读者索取更多资源

River discharge has a significant impact on global ocean models, especially in terms of sea surface salinity and sea surface height. This study uses a global daily varying discharge dataset to analyze the effects of nonseasonal discharge on the ocean. The inclusion of nonseasonal discharge improves the model's accuracy near river mouths, particularly in tropical-to-midlatitude regions. The changes in sea surface height associated with nonseasonal discharge can be explained by the effects of salinity on halosteric height.
River discharge influences ocean dynamics and biogeochemistry. Due to the lack of a systematic, up-to-date global measurement network for river discharge, global ocean models typically use seasonal discharge climatology as forcing. This compromises the simulated nonseasonal variation (the deviation from seasonal climatology) of the ocean near river plumes and undermines their usefulness for interdisciplinary research. Recently, a reanalysis-based daily varying global discharge data set was developed, providing the first opportunity to quantify nonseasonal discharge effects on global ocean models. Here we use this data set to force a global ocean model for the 1992-2017 period. We contrast this experiment with another experiment (with identical atmospheric forcings) forced by seasonal climatology from the same discharge data set to isolate nonseasonal discharge effects, focusing on sea surface salinity (SSS) and sea surface height (SSH). Near major river mouths, nonseasonal discharge causes standard deviations in SSS (SSH) of 1.3-3 practical salinity unit (1-2.7 cm). The inclusion of nonseasonal discharge results in notable improvement of model SSS against satellite SSS near most of the tropical-to-midlatitude river mouths and minor improvement of model SSH against satellite or in-situ SSH near some of the river mouths. SSH changes associated with nonseasonal discharge can be explained by salinity effects on halosteric height and estimated accurately through the associated SSS changes. A recent theory predicting river discharge impact on SSH is found to perform reasonably well overall but underestimates the impact on SSH around the global ocean and has limited skill when applied to rivers near the equator and in the Arctic Ocean.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据