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| Titel |
Microphysical Consistency between Grid-Resolved and Subgrid Cloud Parameterizations at Grey-Zone Resolution |
| VerfasserIn |
Jian-Wen Bao, Evelyn D. Grell, Sara A. Michelson, Georg A. Grell |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107356
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| Publikation (Nr.) |
 EGU/EGU2015-7053.pdf |
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| Zusammenfassung |
| A great challenge in developing NOAA's Next-Generation Global Prediction System (NGGPS) is the lack of a cloud parameterization package that can be seamlessly applied across the grey-zone resolutions (~1 to 10 km). Properly dealing with the challenge gives rise to two issues associated with subgrid cloud parameterization: assumptions of subgrid-cloud microphysics properties and the impact of the parameterization of subgrid clouds on radiation. These two issues are related to a fundamental question: To what degree should the subgrid cloud microphysics processes be parameterized consistently with the grid-resolved cloud microphysics parameterization? This presentation will focus on major results from a series of numerical sensitivity experiments that are designed to address this fundamental question. The sensitivity experiments are carried out using the resolution-aware Grell and Freitas (2014) subgrid-cloud parameterization scheme in the Advanced Research WRF (ARW) model for an idealized tropical cyclone intensification case. The presentation will demonstrate how the subgrid-cloud parameterization scheme behaves as the microphysics of subgrid clouds become consistent with those of grid-resolved clouds. The implication of these results in the development of cloud parameterization packages suitable for weather and climate simulations at grey-zone resolution will also be discussed in the presentation. |
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