吸湿性均匀混合气溶胶粒子等效吸收系数计算分析

以两种典型的吸湿性气溶胶组分(氯化钠和硫酸铵)为例,采用米氏散射程序,计算了粒子的吸收效率因子等光学参量,并分析了吸湿性气溶胶粒子加热的等效吸收系数随时间的变化规律,着重分析了忽略粒子自身吸收对等效吸收系数的影响,常规计算值与等效吸收系数在1μs时相对误差可达到234.7%和255.2%。同时,就不同相对湿度、不同波长对等效吸收系数含时变化规律的影响进行了对比分析,并讨论了采用均匀混合模型计算结果的相对误差,在1μs时实际值与计算值相对误差最大,分别小于3.62%和7.07%。

Calculation of Equivalent Absorption Coefficient of Uniformly Mixed Hygroscopic Aerosol Particles

By means of the Mie scattering theory, the absorption efficiency factor and other optical factors of hygroscopic aerosol made of NaCl and H2O as well as (NH4)2SO4 and H2O which are set as the typical example are calculated, and the equivalent absorption coefficients with time of them are analyzed. The influence on the equivalent absorption coefficient when ignoring the energy absorbed by particles themselves is analyzed and the relative error of the equivalent absorption coefficient considering and ignoring the energy absorbed by the particles themselves is 234.7% and 255.2% at the time 1 μs, and the influence of different relative humidities and wavelengths on it is discussed. The relative errors of the results calculated by an uniformly mixed model are discussed, and the relative errors of the real results and calculated results are maximum at the time 1 μs which are less than 3.62% and 7.07%, respectively.