Mesoscale cellular convection during cold air outbreaks: A numerical study
A three-dimensional numerical model which makes use of a domain-doubling re-gridding technique is run to study the multi-scale eddy structure evolution during a cold-air outbreak. The simulations include the secondary-flow pattern transition starting with the relatively small-scale boundary layer ro...
| Main Authors: | , |
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| Format: | Conference Object |
| Language: | English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11858/00-001M-0000-002E-10C4-C |
| Summary: | A three-dimensional numerical model which makes use of a domain-doubling re-gridding technique is run to study the multi-scale eddy structure evolution during a cold-air outbreak. The simulations include the secondary-flow pattern transition starting with the relatively small-scale boundary layer rolls developing during the initial phase and ending with mesoscale cellular convection patterns. The model is applied to conditions of a cold-air outbreak observed during the ARKTIS 1991 experiment. It is demonstrated that the most important; features of the observed situation are revealed by the model. Moreover, a sensitivity study is performed in order to investigate the relation between cell broadening and various physical processes. We found that latent heating due to condensation and cloud top radiative cooling are the most relevant processes leading to cell-broadening. |
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