可见光到远红外波段气溶胶衰减计算模式

Calculating model for aerosol extinction from visible to far infrared wavelength

建立了一种根据实测的气溶胶尺度谱分布（Junge指数）、地面能见度、相对湿度和气溶胶衰减廓线计算空间任意两点的气溶胶衰减计算模式，光谱波段范围覆盖了从可见光到远红外（1～25000cm^-1）。利用该气溶胶模式及国际上流行软件MODTRAN中的气溶胶模式同时和光栅太阳辐射计（pgs100）实测气溶胶衰减进行了对比，这种模式与MODTRAN相比，因考虑了气溶胶的实际尺度谱分布和高度分布，计算结果更接近实测值。利用所建立的气溶胶模式还分析了气溶胶衰减受各参数的影响，结果表明：气溶胶衰减受各参数影响较大，说明实测气溶胶参数在计算气溶胶衰减中起重要作用。将此气溶胶模式嵌入到我们自己研制的通用大气辐射传输软件CART中进行大气透过率和大气辐射传输的计算，有助于提高计算精度和增强功能。

An aerosol extinction calculating model for any path in space based on the measured aerosol size distribution （Junge exponent）, surface visibility, relative humidity and aerosol extinction profile has been developed, The model covers spec- tral range from visible- to far infrared-wavelength （1-25 000 cm^-1 ）. The calculated results by this model and by the intern ationally popular software （MODTRAN） have been compared with the measured results of grading-sun-photometer （pgsl00）, Since the parameters of aerosol size distribution and height distribution are considered in the model, the computed result of the present model is more close to the real data than the result of MODTRAN. Analysis shows that the parameters have great effect on aerosol extinction, which illustrates that the measured parameters play important roles in the aerosol extinction calculating model. The model has been embedded into the combined atmospheric radiative transfer（CART） software we have developed for calculating atmospheric transmittance and radiation, which can improve the calculating precision and expand the functions of CART.