敦煌地区大气气溶胶的辐射效应

THE RADIATIVE EFFECT OF AEROSOL IN DUNHUANG AREA

利用敦煌地区1981～1983年地面实测的太阳直接辐射资料计算了该地区大气气溶胶的透射比及气溶胶对辐射削弱量,通过分析大气气溶胶的透射比与直接辐射、散射副射、S′/Q、D/Q的关系以及气溶胶对辐射削弱量与气温、直接辐射、气熔胶透射比的关系,讨论了大气气熔胶的辐射效应,得出了一些初步结论,随着气溶胶透射比的增大直接辐射、Q、S′/Q增大,D/Q减少;气溶胶对辐射的削弱增大时,气温减小,垂直于太阳光束面上的直接辐射减小,气溶胶透射比减小;在干旱地区晴空气溶胶对辐射的削弱占主导地位。

Aerosol transmission coefficient and aerosol radiative attenuation were calculated by using direct solar radiation data observed from 1981 to 1983 in Dunhuang area.Atmospheric aerosol effect on radiation was discussed by analyzing the relation between aerosol transmission coefficient and direct solar radiation,global radiation,S′/Q,D/Q and the relation between radiative attenuation by aerosol and air temperature,direct solar radiation and aerosol transmission coefficient. The results show that S,Q andS′/Q increase with increasing of aerosol thansmission coefficient while D/Q decreases; S and air temperature decrease with the increasing of radiative attenuation by aerosol; In northwest arid area, radiative attenuation by aerosol is predominated on clear sky.