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| Titel |
Unified parameterization of the planetary boundary layer and shallow convection with a higher-order turbulence closure in the Community Atmosphere Model: single-column experiments |
| VerfasserIn |
P. A. Bogenschutz, A. Gettelman, H. Morrison, V. E. Larson, D. P. Schanen, N. R. Meyer, C. Craig |
| 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. 6 ; Nr. 5, no. 6 (2012-11-14), S.1407-1423 |
| Datensatznummer |
250002949
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| Publikation (Nr.) |
 copernicus.org/gmd-5-1407-2012.pdf |
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| Zusammenfassung |
| This paper describes the coupling of the Community Atmosphere Model (CAM) version 5 with a unified
multi-variate probability density function (PDF) parameterization, Cloud Layers Unified by
Binormals (CLUBB). CLUBB replaces the planetary boundary layer (PBL), shallow convection, and
cloud macrophysics schemes in CAM5 with a higher-order turbulence closure based on an assumed PDF.
Comparisons of single-column versions of CAM5 and CAM-CLUBB are provided in this paper for several
boundary layer regimes. As compared to large eddy simulations (LESs), CAM-CLUBB and CAM5 simulate
marine stratocumulus regimes with similar accuracy. For shallow convective regimes, CAM-CLUBB
improves the representation of cloud cover and liquid water path (LWP). In addition, for shallow
convection CAM-CLUBB offers better fidelity for subgrid-scale vertical velocity, which is an
important input for aerosol activation. Finally, CAM-CLUBB results are more robust to changes in
vertical and temporal resolution when compared to CAM5. |
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