作　　者： ; ; ;

机构地区： 中国科学院大气物理研究所

出　　处： 《高原气象》 2004年第3期360-367,共8页

摘　　要： 利用西北干旱区55个站1961—2000年0cm地温和气温资料,利用EOF、旋转EOF分析和小波分析方法,分析了西北干旱区地气温差的空间分布及时间演变特征。结果表明:西北干旱区地气温差6月份最大,1月份最小;春、夏、秋三季均为正值,冬季除个别站点外均为负值。西北干旱区春、夏、秋、冬四季地气温差的空间分布前三个特征向量均表现为三种分布型:全区一致型、南北差异型和东西差异型。在过去40年间,西北干旱区的地气温差表现为四种时间演变型:具有极小值的抛物线型、具有极大值的抛物线型、单调递增型和单调递减型。西北干旱区地气温差的周期振荡主要以3～6年和20年为主,这些周期振荡在不同区域不同时期的显著性不同。 The differences between ground soil and air temperature(T_s-T_a)are analyzed and studied by using the data of ground and air temperature of 55 stations in the arid region of Northwest China from 1961 to 2000, with EOF and REOF analyses and wavelet analysis methods. The results show that (T_s-T_a) in the arid region of Northwest China have the biggest values in June and the smallest values in January; the values of (T_s-T_a)is positive in spring, summer and autumn, but opposite in winter; the first three loading eigenvector reflect the main spatially-anomalous structure of (T_s-T_a) in the arid region of Northwest China that contain the consistent positive or opposite pattern in all of their sub-regions, and the two spatially-opposite patterns in the North and the South and in the East and the West. (T_s-T_a) in the arid region of Northwest China show in the past 40 years there were the four patterns of time evolution including the parabola patterns with the maximum or minimum values, the patterns increasing or decreasing trends in monotonously; (T_s-T_a) have periodic variation about 3～6 years and 20 years.

关 键 词： 西北干旱区 地气温差 分析 小波分析

领　　域： [天文地球]