塔克拉玛干沙漠南缘戈壁下垫面辐射平衡与地表反照率特征OA北大核心CSTPCD

The gobi,a prominent terrain feature in desert regions,exhibits surface characteristics markedly dis-tinct from those of typical desert terrains.Therefore,it is imperative to investigate the radiation balance properties of the gobi's surface in desert environments to enhance the accuracy of parameters used in land-atmosphere ener-gy exchange models,particularly in the Taklimakan Desert.Utilizing continuous observational data from the Qira gobi station,situated on the southern periphery of the Taklimakan Desert as part of the China-Japan Sand and Dust Storm Cooperation Project(ADEC),this study examines the diurnal variations in the components of surface radiation balance at the Qira gobi station throughout the year,across different seasons,and under various weather conditions.The findings indicate that:(1)The peak values for radiation components at the Qira gobi station are typically observed in July,with the exception of upward shortwave radiation,which peaks in January.(2)The di-urnal variation maxima for downward and upward shortwave radiation are recorded in spring,whereas the peak values for downward longwave radiation,upward longwave radiation,and net radiation are noted in summer.(3)During sunny days,the radiation components exhibit a consistent trend across seasons,whereas under cloudy,overcast,and rainy conditions,their variations are erratic.Specifically,during precipitation events,both down-ward and upward longwave radiations significantly surpass the levels of other components.(4)The annual aver-age surface albedo is calculated at 0.32.Notably,the albedo increases substantially during winter owing to snow cover,with the seasonal sequence from highest to lowest being winter,spring,autumn,and summer.The diurnal albedo variation,influenced by the solar zenith angle,forms a smooth"U"shape on clear days,whereas it fluctu-ates irregularly under different weather conditions.