利用1991年2月下旬~5月中旬HEIFE张掖和沙漠站的大气浑浊度观测、地面辐射观测及同期卫星资料,借助NCARCCM3中的辐射模式CRM,模拟估算了我国西北大气沙尘气溶胶的部分光学参数,单次散射反照率(ω₀)和光学厚度比[k(τ_λ=8~14/τ_λ=0.55)]。计算结果表明,清洁天ω₀ 和k(τ_λ=8~14/(τ_λ=0.55)在沙漠和绿洲均为0.94和0.1;浑浊天ω₀ 在绿洲为0.90,沙漠为0.84;k(τ_λ=8~14/τ_λ=0.55)在绿洲为0.3,沙漠为0.4。在气候模式中,可将我国西部沙尘源区大气沙尘的ω₀ 和k(τ_λ=8~14/τ_λ=0.55)分别取为0.88和0.3。

By using of the data of atmospheric turbidity and surface radiation observed at Zhangye(oasis) and Desert stations in HEIFE area during the period from the third decade of February to the second decade of May in1991, together with the data obtained from NOAA-11 satellite overpassing this area at the same time, we estimate single scattering albedo(ω₀) and fraction of optical depth[k(τ_λ=8~10/τ_λ=0.55)] of atmospheric dust aerosols, by employed the radiative model(CRM) in NCAR CCM3. The results show that ω₀ and k(τ_λ=8~10/τ_λ=0.55) is 0.94 in desert and 0.1 in oasis in clear day respectively, but in dusty day(ω₀) is 0.90 in oasis and 0.84 in desert, k(τ_λ=8~10/τ_λ=0.55) is 0.3 in oasis and 0.4 in desert. In the climatic model, for dust source region in northwest China,(ω₀) and k(τ_λ=8~10/τ_λ=0.55) will be 0.88 and 0.3, respectively.