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contributor authorSmith, Craig M.
contributor authorSkyllingstad, Eric D.
date accessioned2017-06-09T16:41:06Z
date available2017-06-09T16:41:06Z
date copyright2011/12/01
date issued2011
identifier issn0027-0644
identifier otherams-72182.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4214157
description abstractimulations are presented focusing on the role of temperature inversions in controlling the formation and strength of downslope wind storms. Three mechanisms are examined depending on the relative height of the inversion with respect to the mountain and the stability of vertically propagating mountain waves. For low-level inversions, flows are generated that closely resemble a reduced gravity shallow water hydraulic response with a large vertical displacement of the inversion on the lee side of the mountain. For higher-level inversion cases, simulated flows more closely followed a stratified hydraulic behavior with the inversion acting as a rigid reflective lid. In the third mechanism, downslope winds were forced by a self-induced critical layer located below the inversion height. The presence of the inversion in this case had little effect on the resulting downslope winds.Observations made on the Falkland Islands show that downslope windstorms may preferentially occur in early morning even without synoptic-scale changes in atmospheric structure. Most windstorms on the Falkland Islands generally have a short jet length; rare, longer jet length storms typically occur in conjunction with a strong low-level inversion. Idealized numerical experiments tend to produce a similar response depending on the presence of strong low-level inversion and surface cooling. Results suggest that surface heating can have significant control on the flow response by reducing the low-level inversion strength, or by changing the stratification and wind velocity below the inversion, thereby preventing a strong downslope windstorm.
publisherAmerican Meteorological Society
titleEffects of Inversion Height and Surface Heat Flux on Downslope Windstorms
typeJournal Paper
journal volume139
journal issue12
journal titleMonthly Weather Review
identifier doi10.1175/2011MWR3619.1
journal fristpage3750
journal lastpage3764
treeMonthly Weather Review:;2011:;volume( 139 ):;issue: 012
contenttypeFulltext


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