温度和质量浓度对硫酸气溶胶光学特性的影响

Temperature and concentration effect on optical characteristics of H2SO4 aerosol

摘要: 根据新版大气分子光谱资料集(HITRAN2008)中硫酸气溶胶的复折射指数资料，利用经典的Mie理论编写程序，计算不同温度和质量浓度下硫酸气溶胶粒子在10m和0.87m 2个波段的散射效率和散射相函数。结果表明，在10m波段，在相同的H2SO4/H2O质量浓度下，温度越高，硫酸气溶胶的后向散射强度越强，即冷却作用越强；在相同的温度下，硫酸粒子的质量浓度越小，其后向散射越弱，冷却作用越弱。在0.87m波段，硫酸粒子质量浓度一定时，温度变化对硫酸粒子散射强度的影响不大；若温度一定，在散射角大于173的后向方向，硫酸质量浓度越大，散射强度越小，其冷却效应越弱。

Abstract: Based on Mie theory and HITRAN2008 data, the scattering efficiency and phase function of H2SO4 aerosol at 10m and 0.87m wavelengths were analyzed when the aerosol radius was 2m and 5m. The results show that the cooling effect of H2SO4 particle is stronger at 10m wavelength with higher temperature under same H2SO4/H2O, while there is almost no effect at 0.87m wavelength. The results also show that the cooling effect of H2SO4 particle is weaker when the scattering angles are larger than 173 degree at 0.87m wavelength with higher H2SO4/H2O under the same temperature.