Accession Number:

AD0733670

Title:

Numerical Experiments on the Relation between Microphysics and Dynamics in Cumulus Convection

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CA

Personal Author(s):

Report Date:

1971-09-01

Pagination or Media Count:

55.0

Abstract:

A previous numerical model of cumulus growth that treated condensation but not precipitation is modified by the addition of a parameterized treatment of liquid-phase microphysics. This modification improves the realism of the results for several parameters, including maximum height of cloud growth, maximum liquid content, amount and distribution of temperature departure, cloud shape, and occurrence and strength of subcloud down-draft. It is found that one of the most important controlling features in cloud growth is the rate of evaporation of droplets. In particular, the introduction of a class of large particles with a relatively slow evaporation rate produces a smaller temperature deficit at the cloud summit, hence more vigorous cloud growth.

Subject Categories:

  • Atmospheric Physics
  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE