江蘇南部汛期降水日變化特征分析

doi:10.3969/2014jms.0060

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江蘇南部汛期降水日變化特征分析
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                        10.3969/2014jms.0060
                    
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基金項目:中國氣象局氣象關鍵技術集成與應用項目(CMAGJ2014M20);中國氣象局氣候變化專項(CCSF201411);江蘇省自然科學基金項目(BK2012888);江蘇省氣象科研基金(KZ201404);江蘇省青年氣象科研基金(Q201423)

Characteristics analysis on diurnal variation of precipitation in flood season of southern Jiangsu

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摘要:

利用江蘇南部20個氣象觀測站2008—2012年汛期(5—10月)逐小時降水資料,應用降水頻率來分析了江蘇南部地區(qū)降水日變化基本特征和區(qū)域差異.研究表明:降水日變化特征地域性差異較強,西部站、東部站和東北沿海站都存在一定的特征差異.東部站降水量的最大值主要出現(xiàn)在下午和傍晚;西部站降水量主峰值出現(xiàn)在下午,并且在清晨和夜間還有兩個次峰值;東北沿海站呈現(xiàn)出午前、午后的雙峰值形式.2008—2011年降水量下午高值區(qū)有先減弱后增強并提前的趨勢,而上午的高值區(qū)有總體減弱并推遲的特征.2011年后有明顯減弱的趨勢.江蘇南部總體來說,短時強降水(大于20和25 mm/h)在16—19時出現(xiàn)主峰值,07—09時也有相對較小的次峰值.

Abstract:

By using hourly precipitation data in rainy season(May-October) from 20 meteorological stations in southern Jiangsu during 2008-2012, the basic characteristics and regional differences of diurnal variation of summer rainfall in southern Jiangsu were analyzed, based on precipitation frequency. Results show that a strong regional difference exists in the diurnal variation characteristics of precipitation, especially in the western, eastern and northeastern coastal stations. The maximum value of precipitation at the eastern stations basically occurs in the afternoon and evening; at the western stations, the main peak happens in the afternoon and two secondary peaks are in the early morning and evening, respectively; at the northeastern coastal stations, a double peak presents before and after midday. During 2008-2011,the annual precipitation in the high-value areas in the afternoon tends to weakening first and then is followed by an enhancing and shifting to an earlier time, while in the morning, it presents overall weakening-delaying; after 2011, a weakening trend occurs obviously. Overall, in southern Jiangsu, the peak of short-term heavy rainfall (especially magnitude more than 20 and 25 mm/h) occurs at 16-19 in the afternoon, and a relatively small peak is observed at 07-09 in the morning.

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費啟,阿不都外力&#;阿不力克木,韓桂榮,陳鈺文.江蘇南部汛期降水日變化特征分析.氣象科學,2014,34(6):678-683 FEI Qili, YANG Jianquan, HAN Guirong, CHEN Yuwen. Characteristics analysis on diurnal variation of precipitation in flood season of southern Jiangsu. Journal of the Meteorological Sciences,2014,34(6):678-683

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收稿日期:2014-03-23
最后修改日期:2014-06-10
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