摘要
利用西藏高原38个气象站点1961-2010年逐月气象资料,通过累积距平曲线和M-K检验可以看出,西藏地区平均气温和年降水均呈现1990年前后由偏低期到偏高期的转变,采用气候倾向率及GIS空间插值方法,对比分析了1990年前后两个时段平均气温和降水的时空变化特征。结果表明:近50年来,西藏呈现出温度升高、降水增多趋势,气温的高值区不断北扩、西伸,且西部地区增温速率最大,降水量的高值区有向西延伸趋势。20世纪90年代以来,除藏东高山深谷区气候由冷湿型向暖干型方向发展外,西藏大部分地区气候向暖湿方向发展。
On the basis of the monthly data of the period of 1961-2010 collected from 38 observational stations over Tibet Plateau,a transition of temperature and precipitation can be found near 1990 by means of the accumulative anomaly and Mann-Kendall test method.By using the climate tendency rate and GIS spatial interpolation methods,we compared the temp-spatial changes of temperature and precipitation averages and climate tendency rates in the region in 1961-1990（period I） and 1991-2010（period Ⅱ）.The results indicated that： in the last 50 years,Tibet showed an increase of temperature,and the climate tendency rates increased noticeably in the west part.Distribution of annual mean temperature in the two periods showed a trend of high value region extending to north and west.Precipitation in Tibet increased also.Distribution of precipitation in the two periods showed a trend of high value region extending to west.Since the 1990＇s,most parts of Tibet got to warmer,except eastern valleys area where the weather became from cold and wet to dry and warm.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第12期167-172,共6页
Journal of Arid Land Resources and Environment
基金
国家环保公益性行业科研专项(201209032)
江苏省2013年度普通高校研究生科研创新计划项目(CXLX13_499)资助
关键词
西藏
气温
降水
Tibet
temperature
precipitation
作者简介
杨春艳（1980-），女，博士研究生，讲师，主要从事3S技术在气象与生态环境中的应用研究。E—mail：yangcy888@163.com
通讯作者：沈渭寿，男，研究员，博士生导师，E-mail：shenweishou@163.com
