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  2015, Vol. 34 Issue (2): 503-514    DOI: 10.7522/j.issn.1000-0534.2013.00171
    
Statistical Characteristics and Variations of Thunderstorm Frequency in South China from 1980 to 2010
LI Sang, GONG Daoyi
State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University, Beijing 100875, China
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Abstract  By using the observed data from 20 weather stations in South China, the characteristics of diurnal, seasonal, multi-year variations and relative atmospheric physical parameters and circulation fields were demonstrated. The results showed that the thunderstorm frequency peak from afternoon to the evening(9% at 12:00(UTC, hereafter the same)), and least in the morning(2% at 03:00). The higher thunderstorm frequency occurred in July and August (>35%), and the lower thunderstorm frequency in December and January(<1%). The annual and summer thunderstorm frequency decreased with a rate of -1%·(10a)-1 and -3.5%·(10a)-1 from 1980s to 21th century, yet after 21th century, it has a weak increasing trend. On the whole year, the ratio of thunderstorm precipitation and total precipitation was 48%, but in summer, the value was 64%. The variation of annual(summer) thunderstorm precipitation were relatively similar with annual(summer) thunderstorm frequency, their correlation coefficient was 0.46(0.71). In summer, accompany with the variation of thunderstorm frequency, the atmospheric circulation exhibits large-scale abnormally in east Asia. During higher thunderstorm frequency month, the western Pacific subtropical high was abnormally weaker. Meanwhile, there was abnormally ascending flows in the upper-middle troposphere over the South China. In addition, from the view of thermal instability, the abnormally high total tolals index and abnormally high convective available potential energy index has significant relationship with thunderstorm frequency, their correlation coefficients were 0.58 and 0.76. The thunderstorm frequency has statistical relevance with the surface temperature, however, it requires substantial investigation to make sure that whether it is a response of thunderstorms thermal and dynamical factor to the global climate change.
Key words:  Thunderstorm      Thunderstorm precipitation      Circulation      Instability     
Received:  21 June 2013      Published:  24 April 2015
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Articles by authors
LI Sang
GONG Daoyi

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LI Sang, GONG Daoyi. Statistical Characteristics and Variations of Thunderstorm Frequency in South China from 1980 to 2010. , 2015, 34(2): 503-514.

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http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2013.00171     OR     http://www.gyqx.ac.cn/EN/Y2015/V34/I2/503

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