Heavy Southern China Spring Rainfall Promoted by Multi‐Year El Niño Events

Abstract Southern China spring rainfall (SCSR) is significant for agricultural sowing and soil moisture accumulation before the rainy summer. A better prediction of the rainfall improves our ability to risk response to natural disasters. It is found that the SCSR can be promoted by multi‐year El Niñ...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Wenxiu Zhong, Yuting Wu, Song Yang, Tianjiao Ma, Qingyu Cai, Qian Liu
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
multi‐year
El Niño
southern China
spring rainfall
East Asia
Geophysics. Cosmic physics
QC801-809
Arctic
Pacific
Online Access:https://doi.org/10.1029/2022GL102346
https://doaj.org/article/df5cc2d187fd4891a61c4f14600c800b
Description
Summary:Abstract Southern China spring rainfall (SCSR) is significant for agricultural sowing and soil moisture accumulation before the rainy summer. A better prediction of the rainfall improves our ability to risk response to natural disasters. It is found that the SCSR can be promoted by multi‐year El Niño events through the high‐latitude pathway (HP) and low‐latitude pathway (LP). The long‐lasting El Niño warming heats the tropical troposphere persistently until the decaying spring, which strengthens the Arctic polar vortex and the mid‐latitude blockings. This HP is in favor of more southward transport of Rossby wave energy and cold air, resulting in strong ascending motions over southern China (SC) in spring. The multi‐year El Niño also induces an enhanced western North Pacific anticyclone and a secondary circulation transporting moisture to SC through the LP. The HP is more important in the early spring, while the LP dominates the heavy SCSR in the late spring.

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