Development and Implementation of a Towering Cumuli & Transient Cumulonimbi Parameterization using Large Eddy Simulations of Deep Convection

• Main Author: Cotton, William R.
• Other Authors: COLORADO STATE UNIV FORT COLLINS DEPT OF ATMOSPHERIC SCIENCE
• Format: Text
• Language: English
• Published: 1998
• Subjects: Meteorology; *STRATUS CLOUDS; *CUMULUS CLOUDS; RADIATIVE TRANSFER; WEATHER FORECASTING; ARCTIC REGIONS; CONVECTION(ATMOSPHERIC); CUMULONIMBUS CLOUDS; CLOUD RADIATION; *CLOUD PREDICTION; CLOUD PARAMETERIZATION; Arctic
• Online Access: http://www.dtic.mil/docs/citations/ADA353499; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA353499

In support of the overall goal of this research to develop a worldwide, interactive nested-grid cloud forecasting numerical prediction model, a new cumulus parameterization scheme and a new two-stream radiation scheme has been developed. The cumulus parameterization scheme is flexible enough to be used at virtually any model grid spacing and is especially useful in an interactive nested grid model where grid spacings from about 100 km to a few kilometers may be employed at the same time over different parts of the model domain. A new two-stream radiation scheme has been developed. The scheme interacts explicitly with the microphysics of the model including the both a bin-representation of liquid and ice particle size-spectra and multi-phase bulk microphysics models with specified size-spectra. The scheme includes a coupling between radiation and the vapor-deposition/evaporation of hydrometeors. The radiation model coupled to a cloud-resolving model of Arctic stratus clouds has been used to examine radiative influences on summertime and transition-season Arctic stratus.