Accession Number:

ADA234751

Title:

Development and Verification of a Physical Cloud-Moisture Model for Use in General Circulation Models

Descriptive Note:

Final rept. 1 Jul 1987-31 Oct 1990

Corporate Author:

UTAH UNIV SALT LAKE CITY CENTER FOR ATMOSPHERIC AND REMOTE SOUNDING STUDIES

Personal Author(s):

Report Date:

1991-01-31

Pagination or Media Count:

161.0

Abstract:

A time dependent, three dimensional, large-scale cloud moisture model has been developed for the prediction of cloud cover, cloud liquidice water content LWCIWC, precipitation, specific humidity and temperature. Partial cloudiness is allowed to form when large-scale relative humidity is less than 100. In the vertical, a 16-layer z-coordinate is adopted. The horizontal resolution is described by 48 equally-spaced longitudinal points and 38 Gaussian latitudes. The wind field is prescribed using the results from a general circulation model GCM. Both liquid and ice phases are included in the model. The liquid phase processes consist of evaporation, condensation, auto conversion, and precipitation. The ice phase processes include heterogeneous nucleation to generate ice crystals, depositional growth to simulate Bergeron- Findeisons processes, sublimation to deplete ice crystals, and gravitational settling of ice crystals. The radiative transfer parameterization program is based on a broadband method and involves the transfer of infrared and solar radiation in clear and cloudy regions.

Subject Categories:

  • Meteorology
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE