Improving a convection-permitting model simulation of a cold air outbreak
Field, P. R., Cotton, R. J., McBeath, K., Lock, A. P., Webster, S. and Allan, R. P. (2014) Improving a convection-permitting model simulation of a cold air outbreak. Quarterly Journal of the Royal Meteorological Society, 140 (678). pp. 124-138. ISSN 00359009
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To link to this article DOI: 10.1002/qj.2116
A convection-permitting local-area model was used to simulate a cold air outbreak crossing from the Norwegian Sea into the Atlantic Ocean near Scotland. A control model run based on an operational configuration of the Met Office UKV high-resolution (1.5 km grid spacing) NWP model was compared to satellite, aircraft and radar data. While the control model captured the large-scale features of the synoptic situation, it was not able to reproduce the shallow (<1.5 km) stratiform layer to the north of the open cellular convection. Liquid water paths were found to be too low in both the stratiform and convective cloud regions. Sensitivity analyses including a modified boundary-layer diagnosis to generate a more well-mixed boundary layer and inhibition of ice formation to lower temperatures improved cloud morphology and comparisons with observational data. Copyright © 2013 Royal Meteorological Society and British Crown Copyright, the Met Office