冰雹天气; ,日变化; 月变化; 年代际变化; 时空分布; 青藏高原," /> 冰雹天气; ,日变化; 月变化; 年代际变化; 时空分布; 青藏高原,"/> Spatiotemporal Variation of Hail Weather in the Northeast  Qinghai-Tibetan Plateau

›› 2014, Vol. 31 ›› Issue (3): 446-451.

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Spatiotemporal Variation of Hail Weather in the Northeast  Qinghai-Tibetan Plateau

ZHANG Li-yang1, YANG Kun1, ZHANG Zhi-xian1,2   

  1. 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Gansu Key Laboratory of Arid Climate Change and Disaster Reduction/Key Open Laboratory of Arid Climate Change and 
    Disaster Reduction, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China
  • Received:2013-01-06 Revised:2013-03-27 Online:2014-05-15 Published:2014-05-30

Abstract: Based on the data from 60 stations in the northeast Qinghai-Tibetan Plateau during the period of 1961-2010, the spatiotemporal and decadal variations of hail weather were analyzed statistically. The results are as follows: ① Hail disasters occurred generally from April to November, but the maximum frequency occurred in June. The daily variation of hail weather centralized from 12:00 to 20:00 (Beijing time), especially from 14:00 to 18:00, it was quite different from different months and decades, and the peakvalue time could be regarded as a reference indicator in forecasting hail weather; ② Geographically, hail weather decreased from the southwest to the northeast, more in central region, and less in the northwest and the southeast, and there was a significant positive correlation between hail frequency and altitude; ③ The occurring frequency of hail weather was the highest in the 1980s, and it was sharply decreased in recent dozen years. Such change trend revealed that there was a correlation between the changes of hail weather and temperature; ④ Viewing from the decadal variation, the occurring frequency of hail weather was continuously increased in the 1960s, but continuously decreased in the 1990s, especially in recent dozen years.

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