相对湿度对气溶胶辐射特性和辐射强迫的影响
THE IMPACT OF RELATIVE HUMIDITY ON THE RADIATIVE PROPERTY AND RADIATIVE FORCING OF SULFATE AEROSOL
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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-0.268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。Abstract: With the complex refractive index data of sulfate and soot aerosols, the radiative property of the aerosol under 8 different relative humidity conditions was calculat ed in this paper. By using the concentration distribut ion (from two CTM models) and LASG GOALS/AGCM, the radiative forcing due to hygroscopic sulfate aerosol was simulated. The results showed that:(1) with t he increase of relative humidity, the mass extinction efficiency fact or decreased in the short wave spectrum; single scatt ering albedo kept unchanged except for small increase in long wave spectrum, and asy mmetry fact or 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/m2, respectively; and (3) when the impact of relative humidity on radiative property was taken into account, the distribution patt erns of radiative forcing simulated were very similar to that of dry sulfate property, but the forcing value decreased by 6%.
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Keywords:
- Relative humidity /
- Radiative property /
- Radiative forcing
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