RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (12): 1934-1944.doi: 10.11870/cjlyzyyhj2016012018

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ANALYSIS OF DIURNAL VARIATION OF MEIYU SEASON RAINFALL OVER THE YANGTZE RIVER BASIN BY TRMM SATELLITE DATA

XU Ming1, WANG Xiao-fang1, GAO Qi2, WANG Xiao-kang1, LAI An-wei1   

  1. 1. Institute of Heavy Rain, CMA, Wuhan 430205, China;
    2. Wuhan Meteorological Center, Wuhan 430074, China
  • Received:2016-04-01 Revised:2016-06-24 Online:2016-12-20
  • Supported by:
    National Natural Science Foundation(41375057,91637211,41328007);Disaster Weather Fund Projects of State Key Laboratory(2014LASW-A05);Science and Technology Development Fund of Hubei Meteorology Bureau(2016Q04);Heavy Rains Open Fund Research of Hubei Province Key Laboratory(IHR201502)

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Abstract: Using the TRMM satellite precipitation data and NCEP/CFSR reanalysis data of temperature, high and wind filed from 1998 to 2013, the characteristics of diurnal variation of Meiyu season precipitation and convection over the Yangtze River Basin were revealed from the point of Climatology. The difference of diurnal variation of rainfall between typical and non-typical Meiyu years, the diurnal variation characteristics of atmospheric elements and their effects on the precipitation and convection were also analyzed. The results showed that, (1) the intense rainfall mainly occurred in the eastern Tibetan Plateau to the Sichuan basin during the night, in the middle and lower reaches of the Yangtze River during the day. The features of diurnal variation of precipitation were significant. The precipitation day peaks in the eastern Tibetan Plateau to the Sichuan basin, the middle reaches of the Yangtze River and Southern China respectively occurred on the middle night, 08 h early morning and 17 h late afternoon. The rainfall in the Yangtze-Huaihe river basin showed semidiurnal cycle, with the two peaks of 08 and 17 h, the afternoon peak was much stronger than the morning. (2) The daily rainfall in the middle reaches was delayed 6 h than the upper reaches of Yangtze River, the lower reaches was further backward, but the intensity and scope of precipitation was much stronger than the upper reaches. (3) The distribution of diurnal variation of typical Meiyu year is consistent to the nearly 15 years of Meiyu season average. The evolution form of non-typical was similar to the above two, only the daily peak time was ahead. (4) The short-time heavy rainfall had a good relationship to the deep convection. The high frequency area was happed in the lower reaches of Yangtze River (the eastern Tibetan Plateau to the Sichuan basin) during the day (night). (5) The diurnal variation of atmospheric temperature and pressure caused the intensity and structure differences of Meiyu front between the day and night. The lower troposphere wind speed was found to gradually weaken in the day, increase in the night, and produced diurnal variation of position of convergence at low level wind filed. These resulted in the diurnal variation of the rainfall and convection of Meiyu season.

Key words: TRMM, the Yangtze River basin, Meiyu season rainfall, diurnal variation

CLC Number: 

  • TV125
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