摘要
利用湖南97个气象站1962~2011年的逐日降水量资料,根据日降水量将降水分为小雨、中雨、大雨、暴雨、大暴雨等量级,通过累计距平百分率、气候倾向率、Mann-Kendall检验、R/S分形分析以及Morlet小波分析等方法,对湖南近50 a各量级降水的年变化特征进行了分析。主要结果包括:全省平均状况而言,除小雨量级外的其他量级年降水量均有增加趋势;湖南各量级降水的年降水量气候倾向率有2个高值中心(湖南中部、湖南西南部)和1个低值中心(湖南西北部);各量级降水的突变时间出现时间不一致,弱降水量级的突变早于强降水量级;各量级降水量的变化周期各不相同,1990年后3 a左右的周期在各量级降水中表现都较明显。
Based on daily precipitation observations from 1962 to 2011 at 97 meteorological stations in Hu' nan Province, the annual variation characteristics of different level precipitation in recent 50 years in Hu' nan were analyzed by using the cumulative anomaly percentage, climate tendency rate, Mann - Kendall test, R/S and Morlet wavelet analysis methods. The major results include that the tendency of each grade annual precipitation except the small rainfall in Hu' nan Province presented increasing trend ; there were two high value center (the middle and the southwest region of Hu' nan) and one low value center (northwest region of Hu' nan) about the climate tendency rate of different grade annual precipitation. The time of abrupt change for each grade annual rainfall was different, for small rainfall it was earlier than that of strong rainfall. And the change period for each grade annual precipitation was different, but the three - year period was in common for each grade rainfall since 1990.
出处
《干旱气象》
2012年第3期353-359,共7页
Journal of Arid Meteorology
基金
国家自然科学基金(40871043
41111120082)
中国气象局预报员专项"湘北一次罕见的大暴雨天气过程分析"
湖南省气象台科技创新项目"湖南湘江流域洪灾对水稻生产的影响评估分析"共同资助
关键词
湖南
各量级降水
气候倾向率
降水变化趋势
Hu' nan Province
different grade precipitation
climate tendency rate
change trend