【摘要】 利用1979年3月~2004年2月月平均的NCEP/DOE新再分析地表感热资料,在分析塔克拉玛干沙漠四季感热基本气候特征的基础上,通过EOF分析方法,对沙漠地表感热异常变化的空间结构和时间演变趋势作了诊断研究。结果表明:1)沙漠地区地表感热通量的分布存在较大的季节和区域性差异。2)根据各季地表感热距平场的EOF分析,该区感热异常主要有全区一致型、南北差异型以及西北~东南差异型三种常见的分布模态;3)近25年来,塔克拉玛干沙漠春季和夏季地表感热在第一空间尺度上总体变化趋势平缓,秋季在波动中有明显增强的趋势;在第二空间尺度上夏季和秋季变化趋势不太显著,而春季在沙漠北部有减弱的趋势,南部有增强的趋势。更多还原

【Abstract】 The monthly mean NCEP/DOE surface sensible heat data of Taklimakan Desert area from March 1979 to February 2004 to analyze the basic climate characteristics of four season sensible heat and space-time distributing characteristic of surface sensible heat flux.The results showed that:(1) The distribution of desert surface sensible heat flux had great seasonal and spacial differences.(2)According to the EOF analysis of each seasons surface sensible flux,there were three typical distribution patterns:"all-consisitent pattern","south-north reversal pattern"and "northwest-southeast reversal pattern".(3) In the last 25 years,variety trend of surface sensible heat flux of Taklimakan Desert was smooth as a whole on the first spacial scale in spring and summer,there had a obvious increase trend in autumn.Variety trend was mild on the second spacial scale in summer and autumn,however,there had a decline trend at north of desert and a increase trend at south of desert in spring.更多还原