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Synoptic-scale weather patterns during Alpine heavy rain

Hoinka, K.P. and Schwierz, C. and Martius, O. (2006) Synoptic-scale weather patterns during Alpine heavy rain. Quarterly Journal of the Royal Meteorological Society, 132, pp. 2853-2860. DOI: 10.1256/qj.05.239.

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Official URL: http://www3.interscience.wiley.com/cgi-bin/jtoc/113388514/

Abstract

Autumnal streamer-type elongated troughs are related to heavy precipitation observed at the southside of the European Alps. In order to study the development of this configuration, the typical structural evolution of the ambient flow in the event of heavy rain is investigated by lagged analyses. The precipitation amounts, both observations at the Alpine southside and from ERA40 forecasts by the ECMWF, are chosen as parameters to be correlated with atmospheric fields provided by the ERA40 data. Indeed, the resulting statistics indicate that the preferable position of elongated streamers is quasi-north–south aligned and extending southward over the Mediterranean Sea with its southern end located between the Pyrenees and northern Africa. A significant orographic impact on the streamer is revealed in the regression fields of the upper-level potential vorticity showing an indentation above the western Alps. The lower-tropospheric regression fields show a zonally elongated pressure signal due to the orographic influence. Up to two days in advance of heavy rain events a regressed meridional humidity flux occurs towards the south-western Alps, which at the event’s peak time is found impinging upon the entire Alpine ridge. The regressed vertical velocity fields exhibit two maxima south of the Alps, a strong one at the western and a weaker one over the eastern Alps.

Document Type:Article
Title:Synoptic-scale weather patterns during Alpine heavy rain
Authors:
AuthorsInstitution or Email of Authors
Hoinka, K.P.UNSPECIFIED
Schwierz, C.ETH, Zürich, CH
Martius, O.ETH, Zürich, CH
Date:2006
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:132
DOI:10.1256/qj.05.239
Page Range:pp. 2853-2860
Status:Published
Keywords:PV-Streamer, Alpen, MAP, Alps flooding, ERA40
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:03 Jul 2007
Last Modified:11 Nov 2014 21:56

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