关键词: 塔克拉玛干沙漠, 潜热通量, 时空特征

Abstract:

The paper analyzed the basic climate characteristics of four seasonal latent heat based on the monthly mean NCEP/DOE surface latent heat flux data of Taklimakan Desert area from March in 1979 to February in 2004. Further, the paper made diagnose on the space-time distributing characteristics of surface latent heat flux by using the EOF analysis method. The results are as follows: ①The distributing surface latent heat flux on desert area has great space-time difference. The surface latent heat flux in summer is the largest, second is in spring and autumn, that in winter is the smallest; the seasonal latent heat fluxes in the west and north-west of the desert are remarkably larger than that in the center and east regions. ②There are three typical abnormal latent heat flux distribution patterns: “all-consistent pattern”, “south-north reversal pattern” and “northwest-southeast reversal pattern”. ③In the 25 years, the variation of surface latent heat flux on Taklimakan Desert has increscent trend on the first space scale in winter, spring, summer and autumn; on the second space scale, it has a descending trend in north and northwest of the desert and an increscent trend in the south and southeast in spring. However, the change trends of surface latent heat flux are less evident in winter, summer and autumn.

Key words: Taklimakan Desert, latent heat flux, space-time characteristic