DTIC ADA094836: One Dimensional Cloud Microphysical Models pdf

DTIC ADA094836: One Dimensional Cloud Microphysical Models

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One-dimensional microphysical models for six different cloud types are proposed. These models were formulated by making use of Khrgian-Mazin’s one-parameter modified gamma distribution to judiciously mate the Russian measurements of cloud liquid water content and mean radius profiles to the German observations of various cloud types. With the drop-size spectra of the clouds thus determined as a function of height, calculation of their optical properties became straightforward. Separate regression relationships were established for the six model clouds, giving liquid water content and mean radius as a function of height above the cloudbase by the method of least-squares fit. It is from these relationships that the drop-size distribution may be derived for any level in a cloud of interest, and hence its spectral extinction coefficients at any wavelengths, in turn, from the distribution. A close examination of these coefficients in the visible and infrared window regions for each of the cloud types revealed that as a function of height they were well represented by polynomial relationships of 3 to 6 degrees.

Regression coefficients for these relationships are presented in three separate tables. The six one-dimensional model cloud types proposed herein may fill the gap which has long been felt in the modeling community and which is also found in our present electro-optical systems atmospheric effects library. (Author

• Creator/s: Defense Technical Information Center
• Date: 10/1/1980
• Year: 1980
• Book Topics/Themes: DTIC Archive, Low, Richard D H, ARMY ELECTRONICS RESEARCH AND DEVELOPMENT COMMAND WSMR NM ATMOSPHERIC SCIENCES LAB, *CLOUDS, MATHEMATICAL MODELS, EXTINCTION, OPTICAL PROPERTIES, PARTICLE SIZE, ELECTROOPTICS, LIQUIDS, WATER, ONE DIMENSIONAL, MOISTURE CONTENT, REGRESSION ANALYSIS, COEFFICIENTS, LEAST SQUARES METHOD, DROPS, LIGHT TRANSMISSION, VISIBLE SPECTRA, STATISTICAL ANALYSIS, CLOUD PHYSICS, HEIGHT, DISTRIBUTION FUNCTIONS, CENTRAL EUROPE, INFRARED WINDOWS, TRANSMISSIVITY

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