A Physically-based, Subgrid Parametrization for the Production and Maintenance of Mixed-phase Clouds in a General Circulation Model
A physically based method for parametrizing the role of subgrid scale turbulence in the production and maintenance of supercooled liquid water and mixed-phase clouds is presented. The approach used is to simplify the dynamics of supersaturation fluctuations to a stochastic differential equation that...
| Published in: | Journal of the Atmospheric Sciences |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Meteorological Society
2016
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| Subjects: | |
| Online Access: | https://eprints.whiterose.ac.uk/91977/ https://eprints.whiterose.ac.uk/91977/8/jas-d-15-0021%252E1.pdf https://doi.org/10.1175/JAS-D-15-0021.1 |
| Summary: | A physically based method for parametrizing the role of subgrid scale turbulence in the production and maintenance of supercooled liquid water and mixed-phase clouds is presented. The approach used is to simplify the dynamics of supersaturation fluctuations to a stochastic differential equation that can be solved analytically, giving increments to the prognostic liquid cloud fraction and liquid water content fields in a General Circulation Model (GCM). Elsewhere, it has been demonstrated that the approach captures the properties of decameter-resolution Large Eddy Simulations of a turbulent mixed-phase environment. In this paper it is shown that it can be implemented in a GCM and the effects that this has on Southern Ocean biases and on Arctic stratus are investigated. |
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