江蘇省夏季暴雨的時空變率特征及其與不同類型ENSO的聯(lián)系

doi:10.3969/2019jms.0029

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江蘇省夏季暴雨的時空變率特征及其與不同類型ENSO的聯(lián)系
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                        10.3969/2019jms.0029
                    
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中圖分類號:P468.024
基金項(xiàng)目:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（2013CB430200）；公益性行業(yè)（氣象）科研專項(xiàng)（GYHY201306050）；江蘇省氣象局重點(diǎn)項(xiàng)目（KZ201606）

Spatial and temporal variation characteristics of summer rainstorm in Jiangsu Province and its relationship with different types of ENSO

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利用1961—2016年江蘇省70個站點(diǎn)的逐日降水資料和暴雨定義，分析了江蘇省半個世紀(jì)以來暴雨發(fā)生的年代際時空變化特征，并分析了不同分布型El Niño發(fā)展年份對江蘇省夏季降水和暴雨的影響特征。結(jié)果表明江蘇省暴雨主要集中在6—8月，暴雨日數(shù)占全年的73.6%，尤其又以7月為最多；暴雨總的分布特點(diǎn)為蘇北多于蘇南，淮北西北部及蘇南東部最少；江蘇暴雨發(fā)生頻次具有明顯的年代際變化，且各地區(qū)暴雨的年代際變化有一定差異，頻發(fā)期為1960s、1990s至今，尤其是1990s以來，全省暴雨增多趨勢明顯，且2011年之后雨帶明顯南移；東部型El Niño發(fā)展年份較中部型El Niño年份的環(huán)流形勢更有利于導(dǎo)致江蘇夏季降水偏多，尤其是沿江蘇南地區(qū)與常年同期均值有顯著性差異。

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Based on the daily precipitation data and the definition of rainstorm in 70 stations in Jiangsu Province from 1961 to 2016, this paper analyzes the interdecadal spatiotemporal variation characteristics of rainstorms in Jiangsu Province in the past half century, and the characteristics of the impact of the development years of ENSO of different distribution patterns on summer precipitation and rainstorms in Jiangsu Province. The results show that the rainstorms in Jiangsu Province are mainly concentrated in June and August, and the number of rainstorm stations accounts for 73.6% of the whole year, especially in July. The rainstorms in the northern Jiangsu are more than that of southern Jiangsu, and are least in Northwest of the northern Huaihe area and the East of the southern Jiangsu. The frequency of rainstorms shows obvious interdecadal variations, and the interdecadal variations of the regional rainstorms are different. The frequent periods of rainstorms are the 1960s and the period from 1990s to the present. In particular, since the 1990s, a marked increase has been shown in the number of rainstorms across the province, and the rain belt has obviously moved southward since 2011. Compared with the central ENSO years, the circulation of eastern ENSO years is more favorable to lead to more precipitation in Jiangsu Province in summer. In particular, there is a significant difference between the precipitation and the mean value of the same period in the southern Jiangsu Province.

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項(xiàng)瑛,鞏慶,艾文文,蔣薇,程婷.江蘇省夏季暴雨的時空變率特征及其與不同類型ENSO的聯(lián)系.氣象科學(xué),2020,40(2):180-190 XIANG Ying, GONG Qing, AI Wenwen, JIANG Wei, CHENG Ting. Spatial and temporal variation characteristics of summer rainstorm in Jiangsu Province and its relationship with different types of ENSO. Journal of the Meteorological Sciences,2020,40(2):180-190

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收稿日期:2017-12-08
最后修改日期:2019-03-04
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在線發(fā)布日期: 2020-05-26
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