摘要
采用已有的气溶胶折射指数等资料 ,计算了在不同的相对湿度条件下硫酸盐气溶胶的辐射特性。结合两种不同化学输送模式 (CTM )的模拟结果及LASGGOALS/AGCM模式 ,模拟估算了考虑相对湿度影响后全球硫酸盐气溶胶的辐射强迫。结果表明 :(1)随着相对湿度的增加 ,硫酸盐气溶胶的质量消光效率因子在短波波段有所减小 ,单次散射反照率仅在长波波段有所增加 ,不对称因子在整个波段均有所增加 ;(2 )用两个CTM资料模拟辐射强迫的结果相差较大 ,其全球平均辐射强迫分别为 - 0 .2 6 8和 - 0 .816W/m2 ;(3)在考虑相对湿度的影响后 ,硫酸盐气溶胶辐射强迫的分布类型与相应干粒子的强迫分布类型基本相同 ,但全球平均的强迫值减少了 6 %左右。
With the complex refractive index data of sulfate and soot aerosols, the radiative property of the aerosol under 8 different relative humidity conditions was calculated in this paper. By using the concentration distribution (from two CTM models) and LASG GOALS/AGCM, the radiative forcing due to hygroscopic sulfate aerosol was simulated. The results showed that: (1) with the increase of relative humidity, the mass extinction efficiency factor decreased in the short wave spectrum; single scattering albedo kept unchanged except for small increase in long wave spectrum, and asymmetry factor increased in whole spectrum; (2) larger differences occurred in radiative forcing simulated by using two CTMs data, and the global mean forcing simulated were -0.268 and -0.816 W/m 2 , respectively; and (3) when the impact of relative humidity on radiative property was taken into account, the distribution patterns of radiative forcing simulated were very similar to that of dry sulfate property, but the forcing value decreased by 6%.
出处
《气象学报》
CAS
CSCD
北大核心
2002年第2期230-237,共8页
Acta Meteorologica Sinica
基金
中国科学院大气物理研究所创新面上项目 8413 0 4
国家"九五"重中之重项目 96 90 8 0 1 0 6。
