河西走廊地区五个典型站干旱指数对比和气候分析

摘要

利用1953-2010年河西走廊地区酒泉、高台、张掖、山丹、武威5个气象站点的月平均气温和降水资料计算年、季降水距平百分率、相对湿润指数和帕默尔干旱指数,通过三种干旱指标的对比,分析河西走廊地区典型站点的气候变化情况.发现近58年来河西走廊地区总体的气候变化存在以“气温升高,降水略增”为主要特点的变化趋势,气候演变存在着季节性和地域性差异,且趋势在冬季表现得更为明显.地区间酒泉和高台的旱情相对严重,张掖、山丹和武威旱情较轻.各季节中以秋季旱情相对明显,不利于农业秋季收获.%Using the monthly mean temperature and average precipitation of Jiuquan station,Gaotai station,Zhangye station,Shandan station,and Wuwei station in Hexi Corridor region,the Precipitation anomaly percentage,Relative humidity index and the Palmer Drought Severity Index were calculated respectively. Based on comparison of these 3 drought indicators,the climate change of Hexi Corridor region was analyzed and it was found that in the recent 58 years the features of the climate in Hexi Corridor region is "temperatures higher with a slight increase of precipitation" ,and the climate changes had seasonal and regional differences,the difference was obvious especially in winter. The areas of Jiuquan and Gaotai had a relative serious drought. The areas of Zhangye,Shandan and Wuwei had a relative light drought. Autumn had a relative serious drought under the 4 seasons,which was not good for the agricultural harvest.