摘要
利用1961—2005年宁夏逐日降水量资料,将降水量划分为9个级别,分析了宁夏45a来各级别降水日数的变化趋势。结果表明:年降水量以平均3.6mm/10a的速率减少;近15a来,冬、春季降水量明显减少,夏、秋季10.0mm以下降水日数明显减少,25.0mm以上降水日数明显增加。以1986年为界的气候变暖前后25.1～50.0mm级别的降水日数夏季和年增加的显著性概率分别达到了5%和1%,降水频率分布呈现向高级别降水量增加的变化趋势。
Trends in frequencies of daily precipitation at nine different levels over the last 45 years have been analyzed in this article, using the daily precipitation data from 1961 to 2005 in Ningxia. It has been found that the annual precipitation decreased at a mean rate of 3.6 mm/10 a. In the recent 15 years, precipitation obviously decreased in winter and spring; in summer and autumn, days of precipitation below 10.0 mm obviously decreased, but days of precipitation over 25.0 mm significantly increased. Differences in summer and yearly days of precipitation in 25.1- 50.0 mm before and after 1986 were statistically significant at 5% and 1% level, respectively. The extreme trends of precipitation are obvious in Ningxia.
出处
《气候变化研究进展》
CSCD
2008年第3期156-160,共5页
Climate Change Research
基金
科技部科研院所社会公益研究专项“宁夏气候对全球气候变化的响应及其机制”项目(2004DIB3J121)
中国气象局气候变化专项(CCSF2007-27)
中英科技合作项目“气候变化对中国农业影响(II)”资助
关键词
气候变化
极端事件
频数
降水
宁夏
climate change
extreme event
frequency
precipitation
Ningxia
