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| Titel |
Coupling a new turbulence parametrization to RegCM adds realistic stratocumulus clouds |
| VerfasserIn |
T. A. O'Brien, P. Y. Chuang, L. C. Sloan, I. C. Faloona, D. L. Rossiter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 4 ; Nr. 5, no. 4 (2012-08-03), S.989-1008 |
| Datensatznummer |
250002768
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| Publikation (Nr.) |
 copernicus.org/gmd-5-989-2012.pdf |
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| Zusammenfassung |
| To model stratocumulus clouds in the regional climate model, RegCM4.1,
the University of Washington (UW) turbulence parametrization has been coupled
to RegCM. We describe improvements in RegCM's coastal and near-coastal
climatology, including improvements in the representation of stratiform clouds.
By comparing output from a 27-yr (1982–2009) simulation of the climate of
western North America to a wide variety of observational data (station data,
satellite data, and aircraft in situ data), we show the following: (1) RegCM-UW
is appropriate for use in general regional climate studies, and (2) the UW
model distinctly improves the representation of the marine boundary layer in
RegCM. These model–data comparisons also show that RegCM-UW has a slight cold
bias, a (wet) precipitation bias, a systematic low bias in the
vertically-integrated liquid water content near the coast, and a high bias in
the fractional cloud coverage. The model represents well the diurnal, monthly,
and interannual variability in low clouds. These results show RegCM-UW as a
nascent mesoscale stratocumulus model that is appropriate for stratocumulus
investigations at scales ranging from hourly to decadal. The source code for
RegCM-UW is publicly available, under the GNU license, through the
International Centre for Theoretical Physics. |
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