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

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

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Influence of the wind profile on the initiation of convection in mountainous terrain
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hagen, Martinmartin.hagen@dlr.de
van Baelen, JoelUniv. de Clermont-Ferrand, F
Richard, EvelyneObservatoire Midi-Pyrénées, Toulouse, F
Datum:2011
Erschienen in:Quarterly Journal of the Royal Meteorological Society
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:137
DOI :10.1002/qj.784
Seitenbereich:Seiten 224-235
Status:veröffentlicht
Stichwörter:COPS; weather radar; orography; Froude number
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Jana Freund
Hinterlegt am:09 Mai 2011 12:29
Letzte Änderung:12 Dez 2013 21:17

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