Variation characteristics and influencing factors of extreme precipitation in the Meiyu area of Yangtze-Huai River Basin during 1960-2014

doi:10.12006/j.issn.1673-1719.2018.053

Abstract

Abstract:

Based on the daily precipitation data from 66 stations in the Meiyu area of Yangtze-Huai River Basin and the NCEP/NCAR reanalysis data from 1960 to 2014, several extreme precipitation indices were used to explore the spatial and temporal variation characteristics and influencing factors of regional summer extreme precipitation with the help of trend analysis, EOF analysis and composite analysis. The main results are as follows: (1) The summer extreme precipitation indices mainly show an upward trend, and the significant ascending zone is mainly located in the eastern part of the region. (2) The first eigenvector of these indices shows a uniform “+” distribution pattern but it’s stronger in the north area, and the second has a “positive in the northwest and negative in the southeast” distribution pattern. Temporal coefficient of the first mode shows an upward trend but the second temporal coefficient has no obvious trend. (3) In the typical years of strong (weak) summer extreme precipitation, the location of the Western Pacific Subtropical High extends westward (eastward), and the mid-latitude region shows the meridional (zonal) circulation characteristics, which is favorable (unfavorable) for the occurrence of the extreme precipitation in the Yangtze-Huai River region. Meanwhile, the intensity of the summer extreme precipitation in the Meiyu area is abnormally strengthened (weakened) when the ascending motion is enhanced in the middle and lower troposphere (when the airflow divergence in the middle troposphere is enhanced), and the water vapor flux is enhanced and convergent (weakened and divergent), leading to more (less) extreme precipitation.

Key words: Extreme precipitation, Temporal and spatial characteristics, Circulation anomaly, Water vapor flux

Cui HAN,Yi-Xing YIN,Yi-Han HUANG,Meng-Yang LIU,Xiao-Jun WANG. Variation characteristics and influencing factors of extreme precipitation in the Meiyu area of Yangtze-Huai River Basin during 1960-2014[J]. Climate Change Research, 2018, 14(5): 445-454.

Figures/Tables 10

Fig. 1 Spatial distributions of 66 meteorological stations in the study area

Table 1 Four extreme precipitation indices used in this study

Fig. 2 Spatial distributions of the linear trend of the summer extreme precipitation indices in the Meiyu area of the Yangtze-Huai River Basin

Table 2 Variance contribution rates of the first and second eigenvector of the indices %

Fig. 3 The first eigenvectors (a,b) and time coefficients (c,d) of the summer PAV and PINT

Fig. 4 The second eigenvectors (a,b) and time coefficients (c,d) of the summer PAV and PINT

Fig. 5 Mean geopotential height fields (a,b) and anomaly geopotential height fields (c,d) at 500 hPa in the typical years of strong extreme precipitation (a,c), weak extreme precipitation (b,d)

Fig. 6 Anomaly wind fields at 850 hPa in the typical years of strong extreme precipitation (a), weak extreme precipitation (b)

Fig. 7 The anomaly fields of horizontal divergence at 200 hPa (a,b) and 850 hPa (c,d) in the typical years of strong extreme precipitation (a,c), weak extreme precipitation (b,d)

Fig. 8 The anomaly fields of the vertically integrated water vapor flux (a,b) and its divergence (c,d) in the typical years of strong extreme precipitation (a,c), weak extreme precipitation (b,d)

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