Surface Radiation Budget and Surface Albedo Characteristics in Eastern Pamir Plateau

Abstract

The surface radiation data observed from June 2020 to June 2021 at the Tashkurgan National Basic Climate Station on the Eastern Pamir Plateau were used to analyze the variations of radiation components and surface albedo in various time scales and weather conditions over this region.The results show that： （1） the variation of radiation flux in the daily average value shows a "V" curve； the annual exposure of downward shortwave radiation， upward shortwave radiation， downward longwave radiation， upward longwave radiation and net radiation are 5001.6， 1370.3， 6090.7， 8550.8 and 1189.0 MJ·m-2， respectively.On the seasonal scale， the radiation flux variations present the patterns with presummer > spring > autumn > winter， and the upward shortwave radiation is highest in winter.（2） with changing weather， the radiation flux is different.when it is sunny， all the radiation flux changes are smoother single-peak type， when it is less cloudy and cloudy， the they are irregular single-peak type， when it is precipitation， they are multi-peak type excepting in winter， the mean radiation flux changes perform sunny > less cloudy > cloudy > precipitation.（3） The average value of surface albedo during the observation period is 0.29， the maximum value occurs in January and the minimum value occurs in July， at 0.58 and 0.24 respectively； seasonally， the surface albedo is maximum in winter and minimum in summer； the surface albedo is "U"-shaped in spring， summer and autumn， and inverted "U"-shaped in winter.The surface albedo values decreasewhen it rains and increase when it snows， indicating that the precipitation types have different effects on the surface albedo.

Keywords

• eastern pamir plateau
• surface radiation budget
• surface albedo