P1.16
Idealized modelling of summertime Arctic stratus during ASCOS
Thomas Daniel Pleavin, University of Leeds, Leeds, United Kingdom; and I. M. Brooks and S. Dobbie
Due to a lack of observational data and hence suitable parameterizations, large scale numerical models often perform badly in their simulation of the Arctic. One major factor for their poor simulation of the summertime boundary layer has been attributed to a lack of understanding of the structure of Arctic stratus clouds and the complex feedback mechanisms which link these to the boundary layer structure and surface. Summertime Arctic stratus differ from their mid-latitude counterparts - on which current parameterizations are based - in several respects, with the result that the surface radiation balance is very poorly represented. With the Arctic region currently experiencing a rapid temperature rise the ability of models to correctly simulate arctic stratus is necessary to help determine future changes in Arctic climate.
Using the unique dataset collected during the ASOCS field campaign, idealised simulations of Arctic stratus will be undertaken to examine their dynamical and microphysical characteristics. These simulations will be carried out using the UK Met Office's Large Eddy Model (LEM) initially with a bulk microphysics scheme. Future modelling will involve more LEM simulations using a bin resolved microphysical scheme and with a single column version of the Met Office's Unified Model to guide development of future Arctic cloud parameterizations.
Poster Session 1, Posters
Monday, 18 May 2009, 5:00 PM-7:00 PM, Wisconsin Ballroom
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