摘要
利用西北地区160个台站1950-2000年夏季降水量资料,分析了西北5个区域夏季旱涝的气候特征,结果表明:西北东部的农牧过渡地带和黄河上中游是气候变化的敏感地带,且严重旱涝较为频繁,而6月是西北东部最易发生雨涝的月份。农牧过渡地带(2区)多数时段,雨涝出现的频次多于干旱,黄河上中游农业区和林业区(1区)的情况则相反。20世纪70年代,严重雨涝发生较少,进入80年代以后随着全球气候变暖,雨涝事件显著增多;严重干旱事件则是自60年代以来逐步减少。同时,西北各区的旱涝演变存在年代际的变化周期和5～6年的准周期振动。
Based on monthly rainfall data from 160 meteorological stations in Northwest China in summer from 1950 through 2000, flood and drought features in five subregions are studied. Occurrences of drought and flood in Region 1 and Region 2 during summer had higher frequencies as compared with other three regions. Frequencies of summer flood were higher than those of drought in Region 2. In contrast, frequencies of flood were higher than those of drought in Region 1. In 1970's,the frequency of serious flood was the lowest in the past fifty years and showed a tendency to increase since 1980's. Frequency of serious drought decreased since 1960's. Evolutions of drought and flood in each subregion had staged feature, having interdecadal and 5-6 years quasi-periodic fluctuation.
出处
《自然灾害学报》
CSCD
北大核心
2004年第5期97-102,共6页
Journal of Natural Disasters
基金
国家科技部社会公益研究专项基金资助项目(WN-2001001-1)
关键词
西北地区
夏季
旱涝
气候
Northwest China
summer
flood/drought
climate
