Analysis of the July 2021 extreme precipitation in Henan using the novel moisture budget equation
Analysis of the July 2021 extreme precipitation in Henan using the novel moisture budget equation
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DOI：
10.1007/s00704-022-04022-7
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发表时间：
2022-03
影响因子：
3.4
通讯作者：
Jianbo Cheng;Yuheng Zhao;R. Zhi;G. Feng
中科院分区：
文献类型：
--
作者：
Jianbo Cheng;Yuheng Zhao;R. Zhi;G. Feng
本研究利用水分收支方程和全球大气环流三型分解对2021年7月17日至22日发生在河南省的极端降水进行了分析。水分收支方程得到的结果表明，动力项和热力学项分别可以解释75%和22%的异常降水，而残差项只能解释3%。散度（平流）的变化是动力（热力学）项的主要贡献者，它可以解释 80%（22%）的异常降水。基于新的水分收支方程进一步分析表明，水平、经向和纬向环流对辐散诱发动力项和平流诱发热力学项引起的异常降水的贡献率分别为13%、13%和76%，表明纬向环流在引起异常降水中起主导作用。还研究了造成这种异常降水的水平、经向和纬向环流的基本物理机制。
In this study, we use the moisture budget equation and the three-pattern decomposition of global atmospheric circulation to analyze the extreme precipitation in Henan Province that occurred from 17 to 22 July 2021. The results obtained from the moisture budget equation show that the dynamic and thermodynamic terms can explain 75% and 22% of the anomalous precipitation, respectively, while the residual term only explains 3%. Changes in divergence (advection) are the main contributor to the dynamic (thermodynamic) term, which can explain 80% (22%) of the anomalous precipitation. Further analysis based on the novel moisture budget equation shows that the contributions of the horizontal, meridional, and zonal circulations to the anomalous precipitation caused by the dynamic term induced by divergence and thermodynamic term induced by advection are 13%, 13%, and 76%, respectively, suggesting the dominant role of zonal circulation in causing this anomalous precipitation. The underlying physical mechanism of horizontal, meridional, and zonal circulations in causing this anomalous precipitation was also studied.