Bimodal Size Distribution Models for Fogs at Meppen, Germany.

Abstract

Models have been fitted to fog data collected at Meppen, Federal Republic of Germany, during February and March 1978. These models are formulated as the sum of two gamma distributions in order to preserve the basic shape characteristics of the observed size distributions--in particular, their bimodal characteristics. The models accept visibility as an input and generate a size distribution consistent wtih this input. Six parameters are required to determine a model size distribution. It is shown that constants can be assigned to two of these parameters. Algorithms, based upon curve fits, are developed for computing the other parameters as a function of visibility. Tables and graphs are presented which demonstrate the capability of the model to reproduce the features of the measured drop-size distributions; also included are comparisons of the derived quantities of liquid water content and infrared extinction coefficients. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1980
Accession Number
ADA085734

Entities

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  • Louis D. Ducan
  • Richard D. H. Low

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  • Atmospheric Sciences Laboratory

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