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contributor authorMorrison, Anthony E.
contributor authorSiems, Steven T.
contributor authorManton, Michael J.
contributor authorNazarov, Alex
date accessioned2017-06-09T16:32:18Z
date available2017-06-09T16:32:18Z
date copyright2010/03/01
date issued2009
identifier issn0027-0644
identifier otherams-69612.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211301
description abstractThe cloud structure associated with two frontal passages over the Southern Ocean and Tasmania is investigated. The first event, during August 2006, is characterized by large quantities of supercooled liquid water and little ice. The second case, during October 2007, is more mixed phase. The Weather Research and Forecasting model (WRFV2.2.1) is evaluated using remote sensed and in situ observations within the post frontal air mass. The Thompson microphysics module is used to describe in-cloud processes, where ice is initiated using the Cooper parameterization at temperatures lower than ?8°C or at ice supersaturations greater than 8%. The evaluated cases are then used to numerically investigate the prevalence of supercooled and mixed-phase clouds over Tasmania and the ocean to the west. The simulations produce marine stratocumulus-like clouds with maximum heights of between 3 and 5 km. These are capped by weak temperature and strong moisture inversions. When the inversion is at temperatures warmer than ?10°C, WRF produces widespread supercooled cloud fields with little glaciation. This is consistent with the limited in situ observations. When the inversion is at higher altitudes, allowing cooler cloud tops, glaciated (and to a lesser extent mixed phase) clouds are more common. The simulations are further explored to evaluate any orographic signature within the cloud structure over Tasmania. No consistent signature is found between the two cases.
publisherAmerican Meteorological Society
titleA Modeling Case Study of Mixed-Phase Clouds over the Southern Ocean and Tasmania
typeJournal Paper
journal volume138
journal issue3
journal titleMonthly Weather Review
identifier doi10.1175/2009MWR3011.1
journal fristpage839
journal lastpage862
treeMonthly Weather Review:;2009:;volume( 138 ):;issue: 003
contenttypeFulltext


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