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| Titel |
Comparison of a global-climate model simulation to a cloud-system resolving model simulation for long-term thin stratocumulus clouds |
| VerfasserIn |
S. S. Lee, J. E. Penner, M. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 17 ; Nr. 9, no. 17 (2009-09-09), S.6497-6520 |
| Datensatznummer |
250007615
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| Publikation (Nr.) |
 copernicus.org/acp-9-6497-2009.pdf |
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| Zusammenfassung |
| A case of thin, warm marine-boundary-layer (MBL) clouds is simulated by a
cloud-system resolving model (CSRM) and is compared to the same case of
clouds simulated by a general circulation model (GCM). In this study, the
simulation by the CSRM adopts higher resolutions which are generally used in
large-eddy simulations (LES) and more advanced microphysics as compared to
those by the GCM, enabling the CSRM-simulation to act as a benchmark to
assess the simulation by the GCM. Explicitly simulated interactions among
the surface latent heat (LH) fluxes, buoyancy fluxes, and cloud-top
entrainment lead to the deepening-warming decoupling and thereby the
transition from stratiform clouds to cumulus clouds in the CSRM. However, in
the simulation by the GCM, these interactions are not resolved and thus the
transition to cumulus clouds is not simulated. This leads to substantial
differences in liquid water content (LWC) and radiation between simulations
by the CSRM and the GCM. When stratocumulus clouds are dominant prior to the
transition to cumulus clouds, interactions between supersaturation and cloud
droplet number concentration (CDNC) (controlling condensation) and those
between rain evaporation and cloud-base instability (controlling cloud
dynamics and thereby condensation) determine LWC and thus the radiation
budget in the simulation by the CSRM. These interactions result in smaller
condensation and thus smaller LWC and reflected solar radiation by clouds in
the simulation by the CSRM than in the simulation by the GCM where these
interactions are not resolved. The resolved interactions (associated with
condensation and the transition to cumulus clouds) lead to better agreement
between the CSRM-simulation and observation than that between the
GCM-simulation and observation. |
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