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Observation of the airflow over the Alps during a foehn event

Hoinka, Klaus-Peter (1985) Observation of the airflow over the Alps during a foehn event. Quarterly Journal of the Royal Meteorological Society, 111, pp. 199-224. Wiley. doi: 10.1002/qj.49711146709. ISSN 0035-9009.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.49711146709/pdf


A detailed analysis is presented of the large-scale, mesoscale and local features of a south-foehn event in the Alps on 8 November 1982. On this day, with a substantial cross-mountain flow, instrumented aircraft made programmed flights back and forth across the Alps between southern Germany and northern Italy. Rawinsonde observations were used to complete the data set. A mesoscale double mountain wave with an amplitude of 1 km was found in the upper troposphere, In the mid troposphere above the Inn valley a rather pronounced wave with an amplitude of 2 km and a wavelength of 50 km was analysed. This wave was close to overturning. The foehn turned out to be accompanied by low wave drag at high levels and with strong wave drag at lower levels. Downward southerly (westerly) momentum flux was evaluated to be 0.3 (0.1) Pa. Mountain drag was estimated to be between 1.6 and 6.7Pa. Light to moderate turbulence was observed immediately to the lee in a low-level turbulence zone over the region of strong gusty surface winds. Finally, special attention has been devoted to the similarities and possible differences between foehn in the Alps and chinook in the Rocky Mountains.

Item URL in elib:https://elib.dlr.de/111836/
Document Type:Article
Title:Observation of the airflow over the Alps during a foehn event
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 199-224
Keywords:mesoscale observations; aircraft observations; momentum flux
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Volkert, Dr. Hans
Deposited On:07 Apr 2017 11:31
Last Modified:31 Jul 2019 20:09

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