 |
| Titel |
A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model |
| VerfasserIn |
K. Thayer-Calder, A. Gettelman, C. Craig, S. Goldhaber, P. A. Bogenschutz, C.-C. Chen, H. Morrison, J. Höft, E. Raut, B. M. Griffin, J. K. Weber, V. E. Larson, M. C. Wyant, M. Wang, Z. Guo, S. J. Ghan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 12 ; Nr. 8, no. 12 (2015-12-01), S.3801-3821 |
| Datensatznummer |
250116697
|
| Publikation (Nr.) |
 copernicus.org/gmd-8-3801-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
Most global climate models parameterize separate cloud types using separate
parameterizations. This approach has several disadvantages, including obscure
interactions between parameterizations and inaccurate triggering of cumulus
parameterizations.
Alternatively, a unified cloud parameterization uses one equation set to
represent all cloud types. Such cloud types include stratiform liquid and ice
cloud, shallow convective cloud, and deep convective cloud. Vital to the
success of a unified parameterization is a general interface between clouds
and microphysics. One such interface involves drawing Monte Carlo samples of
subgrid variability of temperature, water vapor, cloud liquid, and cloud ice,
and feeding the sample points into a microphysics scheme.
This study evaluates a unified cloud parameterization and a Monte Carlo
microphysics interface that has been implemented in the Community Atmosphere
Model (CAM) version 5.3. Model computational expense is estimated, and
sensitivity to the number of subcolumns is investigated. Results describing
the mean climate and tropical variability from global simulations are
presented. The new model shows a degradation in precipitation skill but
improvements in shortwave cloud forcing, liquid water path, long-wave cloud
forcing, precipitable water, and tropical wave simulation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|