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Mountain torques and synoptic systems in the Mediterranean

Egger, Joseph and Hoinka, Klaus-Peter (2008) Mountain torques and synoptic systems in the Mediterranean. Quarterly Journal of the Royal Meteorological Society, 134, pp. 1067-1081. DOI: 10.1002/qj.248.

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Official URL: http://www3.interscience.wiley.com/journal/113388514/home

Abstract

The mountains surrounding the Mediterranean exert torques T during the passage of North Atlantic systems which affect the angular momentum of the airflow passing over and around the massifs. The Alps, the Atlas range and the orographic block of Asia Minor are selected to investigate the typical flow conditions during torque events. These mountain ranges are small enough to justify a local angular momentum analysis. Both the zonal and the meridional components of a mountain’s torque (Tλ and Tϕ) are used as stratification parameters in a statistical investigation of the interaction of large-scale perturbations with this mountain. How are these flows affected by the obstacle? A simple scheme is tested which attempts to interpret results. The torque analysis singles out eastward-moving large-scale systems. Their isobars are oriented from southwest (northwest) to northeast (southeast) near the mountain in zonal torque Tλ (Tϕ) cases. The massifs tend to generate a low-level distortion of the pressure field such that the angular momentum of the flow over the mountain is reduced. These results can be explained within the framework of the scheme. The influence of the mountains on the pressure field is seen only at heights ≤4000 m. The low-level distortions of the pressure field contribute positively to the total torque for lags τ ≤ 0 in the Alps and for all lags −2 ≤ τ ≤ 2 days in Asia Minor, where only Tλ is evaluated. The impact of the Atlas mountains is seen only at τ = 0.

Document Type:Article
Title:Mountain torques and synoptic systems in the Mediterranean
Authors:
AuthorsInstitution or Email of Authors
Egger, JosephUniv. München, München
Hoinka, Klaus-PeterUNSPECIFIED
Date:2008
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:134
DOI:10.1002/qj.248
Page Range:pp. 1067-1081
Status:Published
Keywords:Gebirgswiderstand, Drehmoment der Erde, Mittelmeer, angular momentum; Alps; Atlas mountains; Asia Minor
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:02 Dec 2008
Last Modified:20 Oct 2014 14:32

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