江蘇省城市雷暴日分布特征

doi:10.3969/2012jms.00**

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江蘇省城市雷暴日分布特征
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P427.323
基金項(xiàng)目:江蘇省科技支撐計(jì)劃（社會(huì)發(fā)展）項(xiàng)目（BE2009693）

Distribution characteristics of thunderstorm days in cities of Jiangsu

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利用江蘇省13個(gè)城市1961—2008年共48 a的雷暴日資料，經(jīng)過統(tǒng)計(jì)分析發(fā)現(xiàn)江蘇城市年均雷暴日呈逐年下降趨勢(shì)，雷暴日月變化呈單峰型，7月雷暴日最多，城市年均雷暴日空間分布差異明顯，總體呈中部多，兩端少分布，各城市歷年雷暴日的變化也各有特點(diǎn)，江蘇城市四季雷暴的空間分布隨季節(jié)變化顯著。同時(shí)應(yīng)用主成份方法分析得出全省城市年雷暴日異常具有同步性，但江淮北部—淮北地區(qū)和江淮南部—蘇南地區(qū)的城市年雷暴日異常呈反位相。各城市歷年每月雷暴日出現(xiàn)概率變化特征與月均雷暴日變化一致，全省各城市在7月出現(xiàn)雷暴日的概率最高，但具體到全省每一個(gè)市雷暴日出現(xiàn)概率也有差異，蘇州、無錫7月出現(xiàn)雷暴日概率只是略高于8月，而沿江及以北城市雷暴日主要集中分布在7月。

Abstract:

Based on statistical analysis of thunderstorm days data recorded by 13 ground weather observation posts of Jiangsu Province from 1961 to 2008, the results show that average annual thunderstorm days decline with years, monthly variation of thunderstorm days presents a single peak, and the thunderstorms are the most frequent in July. The differences in regional distribution of average annual thunderstorm days are obvious, more in the middle while fewer in the north and south. Variation of average annual thunderstorm days also had their own characteristics. Spatial distribution of seasonal thunderstorm days changes with time. It is shown in the principal component analysis that the annual thunderstorm days of 13 cities changed at the same time, but those cities in the north of Huaihe River tended to the opposite phase. The monthly probability of occurrence of thunderstorm days changes in the same manner as the average monthly thunderstorm days, the highest probability of occurrence of thunderstorm days appeared in July. However, the probability did not seem to be exactly the same among all the cities, the probability of July is only a little higher than that of August in Suzhou and Wuxi, while the probability of cities along and north of the Yangtze River is more concentrated in July. The results of this paper can provide a basis for lightning protection and early warning.

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王錫中,葉玉珍,鐘穎穎,蔣海琴,高曉靜.江蘇省城市雷暴日分布特征.氣象科學(xué),2011,(1):93-99 Wang Xizhong, Ye Yuzhen, Zhong Yingying, Jiang Haiqin, Gao Xiaojing. Distribution characteristics of thunderstorm days in cities of Jiangsu. Journal of the Meteorological Sciences,2011,(1):93-99

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