Spatial-Temporal Variation of Extreme Precipitation Events from June to July over Yangtze-Huaihe River Basin and the Circulation Anomalies

  • YANG Wei ,
  • XU Min ,
  • ZHOU Shunwu ,
  • LUO Liansheng
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  • Anhui Climate Centre, Hefei 230031, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received date: 2015-10-12

  Online published: 2017-06-28

Abstract

Based on the recent 53 years (1961-2013) daily observational precipitation and NCEP/NCAR reanalysis data, extreme precipitation thresholds from June to July over Yangtze-Huaihe River Basin are defined by using percentile method. Extreme precipitation events are classified into three patterns according to EOF analysis, which are patterns along Huaihe River, along Yangtze River and south of Yangtze River. The typical cases of each pattern are selected and the atmospheric circulation situations are diagnosed subsequently. The results show that:When three patterns of extreme precipitation events happen, southwest low-level jets exist from western south China to middle and lower reaches of Yangtze River at 850 hPa without exception. Jet intensity of pattern along Huaihe River expresses the strongest with the jet axis locating northernmost, pattern along Yangtze River is the second, while pattern south of Yangtze River is the weakest and southernmost. Ridge line and western ridge point of West Pacific Subtropical High at 500 hPa mainly change the location of jet axis to affect the extreme precipitation region. At 200 hPa, upper westerly jet is stronger with a narrow jet band, the right side of upper jet entrance coincides with north side of lower jet reasonably. It is pointed that under the corporate effect of lower and upper jets, vertical velocity above the extreme precipitation region represents abnormally stronger with anomalous larger specific humidity, the location of Meiyu front is attributed to the region of extreme precipitation. Water vapors for all three patterns mainly come from the Bay of Bengal to South China Sea.

Cite this article

YANG Wei , XU Min , ZHOU Shunwu , LUO Liansheng . Spatial-Temporal Variation of Extreme Precipitation Events from June to July over Yangtze-Huaihe River Basin and the Circulation Anomalies[J]. Plateau Meteorology, 2017 , 36(3) : 718 -735 . DOI: 10.7522/j.issn.1000-0534.2016.00047

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