利用HITRAN资料研究黑碳和沙尘气溶胶粒子的光学特性

Optical characteristics of black carbon and dust aerosols with HITRAN data

摘要: 在IDL程序语言中实现Mie理论的数值算法，利用HITRAN资料提供的气溶胶粒子复折射指数，计算分析了沙尘、黑炭2种气溶胶粒子在不同半径（1m，2.5m和10m）时，对波长为400nm和860nm光的散射效率以及散射相函数矩阵元素。结果表明：黑炭与沙尘有明显的光学性质差别，沙尘粒子不仅散射效率大于黑碳，而且后向散射比黑碳粒子强。 2种粒子对400 nm和860 nm太阳光的偏振也不同，可以利用此特性鉴别这2种气溶胶。

Abstract: The numerical algorithm of Mie theory was realized in IDL. The scattering efficiency and phase matrix elements of black carbon and dust aerosols at 400nm and 860nm wavelength were calculated when their radius were 1m，2.5m and 10m. The results show that the optical characteristics of the black carbon and dust are significantly different, and both the scattering efficiency and backward scattering of the dust are greater than those of the black carbon. Since the lighting polarizations of the two aerosols are different at the sun light of 400nm and 860nm, both the aerosols can be distinguished with the characteristics.