The Leading Modes of Summertime Precipitation Anomalies over the Yangtze River Basin and Possible Causes

XIAO Zhixiang; TAN Jianghong

doi:10.7522/j.issn.1000-0534.2018.00019

Plateau Meteorology >

2018 , Vol. 37 >Issue 5: 1304 - 1312

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00019

The Leading Modes of Summertime Precipitation Anomalies over the Yangtze River Basin and Possible Causes

XIAO Zhixiang ,
TAN Jianghong

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Guangxi Meteorological Observatory, Nanning 530022, Guangxi, China;Meteorological Bureau of Jingzhou, Jingzhou 434100, Hubei, China

Received date: 2017-10-10

Online published: 2018-10-28

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Abstract

Based on the daily mean rainfall data at 202 stations within Yangtze River basin, the daily gridded precipitation, with a horizontal resolution of 0.5°×0.5° for the China domain from National Meteorological Information Center in version 2, and the JRA-55 reanalysis datasets, the leading modes of summertime precipitation anomalies over the Yangtze River basin were investigated with Empirical Orthogonal Function (EOF) and its possible causes were revealed. The analysis showed that there are two dominant modes of the summertime precipitation over Yangtze River basin. The first EOF mode (EOF1) depicts a characteristic of unified spatial distribution with obvious interannual variation, representing the typical drought and flood events of the summer precipitation over the Yangtze River basin. And the second EOF model (EOF2) exhibits a characteristic of meridional dipole pattern with obvious interdecadal variability overlay on interannual variability. Moreover, results also showed that the EOF2 pattern is closely associated with the anti-cyclone anomaly over the Scandinavian Peninsula, which stimulates a teleconnection wave-train at 200 hPa, making the South Asian High shrinks westward and the western Pacific subtropical high shifts eastward. Thus, water vapor transportation shifts eastward and southward over Eastern China, favoring moisture convergent and divergent over the southern and northern part of the Yangtze River basin, respectively. And then the seesaw precipitation anomaly pattern forms over the southern and northern part of the Yangtze River basin.

Key words： Yangtze River basin; summertime precipita; leading mode; spatial-temporal var

Cite this article

XIAO Zhixiang , TAN Jianghong . The Leading Modes of Summertime Precipitation Anomalies over the Yangtze River Basin and Possible Causes[J]. Plateau Meteorology, 2018 , 37(5) : 1304 -1312 . DOI: 10.7522/j.issn.1000-0534.2018.00019

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