Single Scattering Code AGAUSX: Theory, Applications, Comparisons, and Listing

摘要

Since the overall running time of Mie codes may be greatly reduced by reducing the number of particle sizes treated, it is desirable to have a code in which one may specify an acceptable level of accuracy and which then uses only as many particle radius values as are needed to satisfy that requirement; AGAUSX is such a code. The user of AGAUSX can specify a 'convergence' level which represents the minimum fractional accuracy that is acceptable for certain results of a run. Other capabilities offered by AGAUSX include provisions for (1) producing phase functions, scattering fractions or an analytic phase function; (2) cycling over a range of wavelengths; (3) treating changes in hygroscopic particle sizes; (4) treating multicomponent aerosols differing in specific gravity and/or optical properties; (5) options whereby users can either input particle number density or mass density and mass concentration; (6) various size distribution models; and (7) automatic look up and/or interpolation of optical constants for liquid water. A comparison of AGAUSX with other Mie codes is also presented. (Author)