四川秋季連陰雨的變化特征和時(shí)空分布

doi:10.3969/2012jms.0135

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四川秋季連陰雨的變化特征和時(shí)空分布
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                        10.3969/2012jms.0135
                    
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基金項(xiàng)目:公益性行業(yè)(氣象)科研專項(xiàng)(GYHY201006023);國家科技支撐計(jì)劃項(xiàng)目(2009BAC51B00)

Variation characteristics and space-time distribution of continuous rainfall in autumn of Sichuan

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利用1961-2007年四川省38個站9-11月的日降水資料,從發(fā)生次數(shù)、降水量和持續(xù)天數(shù)三方面資料,應(yīng)用現(xiàn)代氣候統(tǒng)計(jì)診斷方法,對四川秋季連陰雨的變化特征和時(shí)空分布進(jìn)行了分析。結(jié)果表明:四川秋雨量約占四川全年降水量的四分之一,其中秋季連陰雨量約占全年降水的五分之一、約占秋雨量的80%;四川秋季連陰雨的發(fā)生次數(shù)、降水量和持續(xù)天數(shù)總體上均呈減少趨勢,這種減少是一種突變現(xiàn)象,發(fā)生在1980s中后期;從地域上來看,四川秋季連陰雨總體上呈西部增多、東部減少的趨勢;EOF分析結(jié)果表明四川秋季連陰雨最主要的特征為東西反相型分布。

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Using 47 a(1961-2007) daily precipitation data from 38 stations in Sichuan during September-November, this paper analyses variation characteristics and space-time distribution of continuous rainfall in autumn of Sichuan from aspects of frequency, precipitation amount, and durative days by means of several modern diagnostic methods in meteorological statistics. The results show that the precipitation amount in autumn in Sichuan makes up about a quarter of annual precipitation, and the precipitation amount of continuous rainfall in autumn accounts for about one fifth, which is 80 percent of the precipitation of autumn rainfall in Sichuan. The frequency, precipitation amount and the durative days all have a decreasing trend in the mass. This decreasing phenomenon is a kind of mutation and appears in later period of 1980s. The continuous rainfall in autumn increases in western Sichuan while decreases in the east as a whole. According to analysis results by EOF, the overriding spatial pattern belongs to the antiphase distribution between the east and the west of Sichuan.

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江益,范廣洲,周定文,吳澤.四川秋季連陰雨的變化特征和時(shí)空分布.氣象科學(xué),2013,33(3):316-324 JIANG Yi, FAN Guangzhou, ZHOU Dingwen, WU Ze. Variation characteristics and space-time distribution of continuous rainfall in autumn of Sichuan. Journal of the Meteorological Sciences,2013,33(3):316-324

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收稿日期:2011-12-10
最后修改日期:2012-06-12
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在線發(fā)布日期: 2013-06-24
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