阿拉善高原近45a来气温变化特征分析  

Analysis on Mean Air Temperature Changes in Alxa Plateau in Last 45 Years

作　　者：李春筱[1,2] 董治宝[1] 常佩静 徐永旺[2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000 [2]内蒙古阿拉善盟气象局,内蒙古巴彦浩特750300

出　　处：《中国沙漠》2011年第3期788-792,共5页Journal of Desert Research

基　　金：国家自然科学基金项目(40871003)资助

摘　　要：采用1961—2005年阿拉善高原8个测站的温度资料,分析了夏季和冬季的最高/最低日平均气温,以及不同界限温度日数、生长季日数、积温等气象要素的特征与变化趋势。结果表明,近45 a来,阿拉善高原夏季、冬季的最高和最低日平均气温均呈波动上升趋势,冬季最高日平均气温升幅最大,夏季最低日平均气温升幅最小;气温序列线性增温率大致呈现由东南向西北递增的趋势,巴彦浩特单站增温率与阿拉善西北部相当。日平均温度高于30℃的炎热日数在近年来增幅较大;日平均温度在20~30℃之间的温暖日数和0℃^-10℃之间的寒冷日数变化不大;低于-10℃的严寒日数大幅减少。生长季日数变化不大,生长季积温均有上升趋势。Based on data of mean air temperature during 1961-2005 from 8 meteorological stations in Alxa Plateau, we analyzed the characteristics and variation trend of 4 sequences about the maximum and the minimum mean air temperature in summer and winter, and days of growth season and accumulated temperature in growth season. The change trend of the mean temperature showed a fluctuation and increase in recent 45 years, whereas the biggest increase extent occurred in winter for the maximum mean temperature, and the smallest increase extent occurred in summer for the minimum mean temperature. Temperature series showed a roughly linear increasing rate from southeast to northwest in Alxa Plateau, and the increasing rate in Bayanhot is equal to that in northwestern region of the Alxa Plateau. The hot days（≥30 ℃ ） increase obviously in recent years, and the variation of the warm days and the cool days is not obvious, while the cold days （4-10 ℃） decrease obviously. The change of days of growth season is not obvious, but the accumulated temperature in growth season increases remarkably.

关 键 词：气温 阿拉善高原 全球变暖 

分 类 号：P423.3[天文地球—大气科学及气象学]