THE CHARACTERISTICS OF THUNDERSTORM FREQUENCY VARIATION AND THEIR POSSIBLE RELATION WITH THE ADJUSTMENT
OF CROP DISTRIBUTION IN THE LEIZHOU PENINSULA |
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Authors: | ZHANG Yu and NIU Sheng-jie |
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Institution: | 1. Key Laboratory for Atmospheric Physics and Environment. Nanjing University of Information Science & Technology,Nanjing 210044 China;Zhanjiang Bureau of Meteorology,Zhanjiang,Guangdong Province,524001 China 2. Key Laboratory for Atmospheric Physics and Environment. Nanjing University of Information Science & Technology,Nanjing 210044 China |
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Abstract: | In order to research possible influences of the adjustment of plant distribution on the
development frequency of thunderstorms over the Leizhou Peninsula, mathematic statistic methods,
including correlation analyses, 11 kinds of fitting models and all-variable regression methods, were used
for analyses and research. The results show that the average trend of the number of annual thunderstorm
days is descending obviously, and there are thunderstorms in all seasons, in which warm post-midday
thunderstorms have taken up the most part, and high frequency is found from May to September, and the
starting and ending dates of thunderstorms have a great annual discrepancy. The vegetation structure has
been improved along with the reduction of rice fields and the area increment of sugarcane and fruits
planting, which results in the decrease of the number of thunderstorm days; the change in the
characteristics of winter spare fields, which is caused by the planting of vegetables, limits the formation of
thunderstorms in early winter and late spring. Meanwhile, the area adjustment of peanut planting has little
influence on the variation of thunderstorm days. The adjustment of principal crop distribution, such as rice,
sugarcane, fruits and vegetables, may have obvious influence on the formation of thunderstorms, and
sugarcane has the largest effect, followed in turn by rice, vegetables and fruits, and the adjustment of crop
distribution has little influence on the starting and ending dates of thunderstorms. |
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Keywords: | atmospheric physics thunderstorm frequency variation mathematic statistic methods adjustmentof crop distribution |
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