Articles | Volume 3, issue 1
Weather Clim. Dynam., 3, 279–303, 2022
https://doi.org/10.5194/wcd-3-279-2022
Weather Clim. Dynam., 3, 279–303, 2022
https://doi.org/10.5194/wcd-3-279-2022
Research article
25 Mar 2022
Research article | 25 Mar 2022

Is it north or west foehn? A Lagrangian analysis of Penetration and Interruption of Alpine Foehn intensive observation period 1 (PIANO IOP 1)

Manuel Saigger and Alexander Gohm

Data sets

PIANO (Penetration and Interruption of Alpine Foehn) - Doppler wind lidar data set Alexander Gohm, Maren Haid, Lukas Umek, Helen C. Ward, and Mathias W. Rotach https://doi.org/10.5281/zenodo.4674773

PIANO (Penetration and Interruption of Alpine Foehn) - MOMAA weather station data set Alexander Gohm, Lukas Umek, Maren Haid, Helen C. Ward, and Mathias W. Rotach https://doi.org/10.5281/zenodo.4745957

PIANO (Penetration and Interruption of Alpine Foehn) - HOBO temperature and humidity logger data set Alexander Gohm, Thomas Muschinski, Maren Haid, Lukas Umek, Helen C. Ward, and Mathias W. Rotach https://doi.org/10.5281/zenodo.4672313

Model code and software

LAGRANTO - The Lagrangian Analysis Tool Atmospheric Dynamics Group, Institute for Atmospheric and Climate Science, ETH Zurich https://iacweb.ethz.ch/staff/sprenger/lagranto/home.html

The Weather Research and Forecasting Model University Corporation for Atmospheric Research https://www2.mmm.ucar.edu/wrf/users/

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Short summary
In this work a special form of a foehn wind in an Alpine valley with a large-scale northwesterly flow is investigated. The study clarifies the origin of the air mass and the mechanisms by which this air enters the valley. A trajectory analysis shows that the location where the main airstream passes the crest line is more suitable for a foehn classification than the local or large-scale wind direction. Mountain waves and a lee rotor were crucial for importing air into the valley.