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Influence of the wind profile on the initiation of convection in mountainous terrain

Hagen, Martin and van Baelen, Joel and Richard, Evelyne (2011) Influence of the wind profile on the initiation of convection in mountainous terrain. Quarterly Journal of the Royal Meteorological Society, 137, pp. 224-235. DOI: 10.1002/qj.784.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.784/abstract

Abstract

A number of days with small precipitating convective cells were investigated using weather radars during the COPS (Convective and Orographically-induced Precipitation Study) field campaign in the region of the Vosges and the Rhine Valley in Central Europe. Depending on the weather situation, two distinct mechanisms could be identified for the initiation of convection.On some days, cells were initiated over the ridge of theVosges, whereas on other days cells were initiated in the lee of the Vosges. The initiation of convection appeared to be concentrated in a few favourable locations. Using the Froude number, it was possible to describe the two distinct mechanisms. When the Froude number was low, the flow was diverted around the Vosges and thermally driven convergence at the ridge initiated convection, whereas when the Froude number was high, the flow passed through mountain gaps and then converged on the lee side with the flow in the Rhine Valley. The convergence on the lee side was enhanced at locations where the outflows through valleys converged. Low Froude numbers were accompanied by weak winds varying with height,whereas high Froude numbers were observed during situations with stronger southwesterly winds increasing with height.

Document Type:Article
Title:Influence of the wind profile on the initiation of convection in mountainous terrain
Authors:
AuthorsInstitution or Email of Authors
Hagen, Martinmartin.hagen@dlr.de
van Baelen, JoelUniv. de Clermont-Ferrand, F
Richard, EvelyneObservatoire Midi-Pyrénées, Toulouse, F
Date:2011
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:137
DOI:10.1002/qj.784
Page Range:pp. 224-235
Status:Published
Keywords:COPS; weather radar; orography; Froude number
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:09 May 2011 12:29
Last Modified:12 Dec 2013 21:17

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