Abstract:

In this paper, The direct radiation, diffuse radiation and total radiation in the north margin of Taklimakan desert were analyzed based on the radiation data observed directly in the oase-desert transition zone of Xiaotang area in 2018. The results show that the diffuse radiation and the total annual radiation exposure were 3 323.8 and 5 781.8 MJ·m^-2, respectively. The maximum radiation exposure was in May and the minimum was in December. The total monthly radiation exposure was the largest in July and the smallest in December. Direct radiation: summer > autumn>spring>winter; Diffuse radiation: spring>summer>autumn>winter; Total radiation: summer>spring>autumn>winter. The daily variation of sunny days was small in the morning and evening, and large at noon. In sandstorm days, the value of diffuse radiation increased to be consistent with the total radiation, and the direct radiation attenuation was the most obvious. In Xiaotang area, the solar altitude Angle was 74° in summer and 42° in winter. When there was snow on the ground, the diffuse radiation increases by 47.5% compared with that in sunny days.

Key words: oasis-desert transition zone, Takliamakan Desert, direct radiation, diffuse radiation, total radiation