阿克达拉大气本底站地表辐射收支特征OA北大核心CSTPCD

Changes in surface radiation budgets significantly affect regional and global climates,particularly in ar-id and semi-arid areas.The underlying surface of the Gobi wetland and desert steppe vegetation in the area sur-rounding the Akedala atmospheric background station is representative of northern Xinjiang and the hinterland of Asia and Europe.Meanwhile,its atmospheric background is clean and experiences long winter snow,making its surface radiation special.However,research on the radiation budget of the Gobi in northern Xinjiang is limited.Therefore,it is necessary to study the characteristics of its radiation budget.The four components of surface radia-tion from November 1,2021-October 31,2022 of the Akedala atmospheric background station reference radia-tion observation system were used to analyze the changes in surface radiation and albedo in different time scales and precipitation processes of Akedala atmospheric background station.The results indicated an annual exposure of total solar radiation of 5772.74 MJ·m-2.The seasonal variation of total solar radiation exposure is manifested as the largest in summer,followed by spring,and the smallest in winter.The daily peak of total solar radiation and reflected short-wave radiation in different months is concentrated between 11:00 and 12:00,while the daily peak of ground long-wave radiation is concentrated between 12:00 and 13:00.In addition,the daily peak occur-rence time of atmospheric counter radiation is not obvious.The maximum net income radiation occurs mainly at noon,while the net expenditure radiation peaks mainly at sunset.Total solar radiation,reflected short-wave radia-tion,ground radiation,and surface albedo are weakened during rainfall,while total solar radiation is weakened during snowfall.Ground snow leads to increased surface albedo,while reflected short-wave radiation is en-hanced,thereby weakening daytime ground radiation and ground net radiation.Simultaneously,influenced by the thermal insulation effect of snow,ground radiation is enhanced compared to before snowfall at night.Both rain-fall and snowfall have an enhanced effect on atmospheric counter radiation.The minimum surface albedo on rainy days is 0.16,while a snow depth of 5 cm can increase surface albedo to 0.96.New snow has a higher sur-face albedo than old snow,and stable snow has a daily average surface albedo of 0.72-0.88.The changes in the surface radiation budget,surface albedo,and snow albedo in the Gobi wetland are revealed to a certain extent,providing a reference for understanding the evolution of the underlying land surface process of the Gobi wetter in northwest China and offering a theoretical and scientific basis for further exploration of the physical process of land-atmosphere interaction and climate change in arid and semiarid areas of China.