广西6-8月分级降水的气候特征  被引量:46

Climatic Features of Grading-precipitation (JJA) during 1977~2006 in Guangxi

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作  者:林振敏[1] 姚才[1] 郑宏翔[2] 张薇 

机构地区:[1]广西气象减灾研究所,广西南宁530022 [2]广西气象局,广西南宁530022 [3]南宁市气象局,广西南宁530022

出  处:《气象研究与应用》2007年第2期36-41,共6页Journal of Meteorological Research and Application

基  金:广西青年基金项目(桂科青0542001)资助

摘  要:利用广西87个站1977-2006年6-8月逐日降水资料,研究广西分级降水雨日、降雨量的时空分布特征及变化趋势。指出,广西6-8月小雨雨日最多,暴雨雨量最大。雨日和雨量的空间分布特点是:河谷地区少,山地地区多。广西30年来6-8月有效降水总雨日是不明显的增加趋势,总降雨量是明显的增加趋势,平均每年增加5.6mm。微雨雨日数是明显的减少趋势;大雨雨日和雨量是明显的增加趋势;暴雨雨日和降雨量都是显著的增加趋势,增加趋势最明显的是桂中南的平原地区。有效降水总降雨量的增加趋势主要是由于大雨、暴雨雨日的增加趋势引起的。Based on the daily precipitation observational data (JJA) at 87 stations during the period of 1977-2006, the secular trend and spatial/temporal features of grading-precipitation' s rain days and rainfall in Guangx is studied. It is pointed out that the mean rain days of light rain (JJA) is the most among five precipitation grades, and the mean precipitation of hard rain (JJA) is largest in magnitude. Each grade precipitation' s rain days (precipitation) is more in area near river and is less in mountainous area in magnitude. Mean rain days of efficient precipitation (JJA) appearance is an weak positive trend and mean rainfall of efficient precipitation (JJA) have increased at a mean rate of 5. 6mm per annum. Mean rain days of slight rain (JJA) reduces evidently. Mean rain days (precipitation) of heavy rain (JJA) increase obviously. Mean rain days (rainfall) of hard rain (JJA) show a remarkable positive trend, and the most remarkable positive trend of rain days of hard rain lies in plain and in middle area and the south of Guangxi. The positive trend of mean rainfall of efficient precipitation is caused by the positive trend of mean rainfall of heavy rain and hard rain.

关 键 词:分级降水 有效降水 雨日 降雨量 趋势系数 

分 类 号:P458[天文地球—大气科学及气象学]

 

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