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张掖地区近35年来气温和降水的变化

ISSN号：1003-7578
期刊名称：《干旱区资源与环境》
时间：0
分类：P468.024[天文地球—大气科学及气象学]
作者机构：[1]西北师范大学地理与环境科学学院,兰州730070
相关基金：国家自然科学基金重点项目（40235053）;甘肃省中青年科技基金项目（031-A21-005530）;西北师范大学校青年基金（NWNU-QN-05-42）资助.

关键词：张掖地区, 气候变化, 气温, 降水, Zhangye region, climate change, temperature , precipitation

中文摘要：

利用张掖地区6个气象站1970-2004年月平均气温、月平均最高、最低气温、月降水资料,采用气候倾向率、滑动平均、Mann-Kendall、小波分析等方法对张掖地区近35年的气候变化特征进行分析。结果表明：（1）1970-2004年张掖地区的气温呈现出明显的上升趋势,其中民乐站增幅最高,临泽站增幅最低,平均气温倾向率为0.491℃/10a,且冬季气温增长更为显著;（2）近35年张掖地区的变暖与西北地区同步,但明显早于中国及全球,且升温幅度更大;（3）近35年张掖地区的降水总体呈微弱下降趋势,但显著性不高,对比分析1970-1986年和1987-2004年两个时期降水量,后一个时期夏、秋季降水量减少,而,冬、春季降水量增加其中春季增幅较大;（4）分析认为,张掖地区目前仍处于气温上升,降水量减少的暖干条件,即气候的未转型区。

英文摘要：

Using annual mean, weather stations in zhangy maximum, minimum air temperature and monthly mean precipitation data from 6 e region from 1970 to 2004, climatic tendency rate, moving mean, Mann -Kendall, wavelet analysis, the spatial and temporal patterns of the climatic changes in this region were analyzed. The main findings can be summarized as follows ：（ 1 ） There was an obvious ascending for the interannual variation of air temperature in zhangye region. Among the ascending trend of 6 weather stations Minle is conspicuous and Linze is not significant. The tendency rate of air temperature was 0.725℃/10a in Minle, 0.341℃/10a in Linze and 0.491℃/10a in Zhangye. The air temperature increased more strongly in winter. （2） Compared with China and the global mean, the warming of Zhangye region occurred early. But the warming of Zhangye is as same as northwest China. The tendency rate of air temperature increase in Zhangye region exceeded those for China and the global mean in the same period. （3） It was found that the mean precipitation appeared a weak downward trend in zhangye region from 1970 to 2004, but it was not significant. Compared with two periods, from 1970 to 1986 and 1987 to 2004, the mean precipitation increased in the winter and spring of the last period but decreased in summer and autumn of the last period. The mean precipitation increased more stmnged in spring. By studying the data of two periods, we found that the climate of Zhangye region still tends to be warm and dry, namely the mean temperature increasing and the mean precipitation decreasing. The climatic pattern of Zhangye region was also unchanged.

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