[摘要] An efficient and accurate method for the representation of particlesize distributions in atmospheric models is proposed. The method canbe applied, but is not necessarily restricted, to aerosol mass andnumber size distributions. A piecewise log-normal approximation of thenumber size distribution within sections of the particle size spectrumis used. Two of the free parameters of the log-normalapproximation are obtained from the integrated number and massconcentration in each section. The remaining free parameter is prescribed.The method is efficient in a sense that only relatively fewcalculations are required for applications of the method inatmospheric models.
Applications of the method in simulations of particle growth bycondensation and simulations with a single column model fornucleation, condensation, gravitational settling, wet deposition,and mixing are described. The results are compared to results fromsimulations employing single- and double-moment bin methods that arefrequently used in aerosol modelling. According to these comparisons,the accuracy of the method is noticeably higher than the accuracy ofthe other methods.
