EGU2020-5631
https://doi.org/10.5194/egusphere-egu2020-5631
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Evaluation of thermally driven local winds in the Swiss Alps simulated by a high-resolution NWP model

Juerg Schmidli1 and Abouzar Ghasemi2
Juerg Schmidli and Abouzar Ghasemi
  • 1Goethe University, Institut for Atmospheric and Environmental Sciences, Frankfurt am Main, Germany (schmidli@iau.uni-frankfurt.de)
  • 2Forschungszentrum Jülich GmbH, Jülich, Germany

In fair weather conditions, thermally driven local winds often dominate the wind climatology in deep Alpine valleys resulting in a unique wind climatology for any given valley. The accurate forecasting of these local wind systems is challenging, as they are the result of complex and multi-scale interactions. Even more so, if the aim is an accurate forecast of the winds from the near-surface to the free atmosphere, which can be considered a prerequisite for the accurate prediction of mountain weather.  This study investigates the skill of a high-resolution numerical weather prediction (NWP) model, the most current version of the COSMO-DWD model,  at 1.1 km grid spacing in simulating the thermally driven local winds in the Swiss Alps for a month-long period in September 2016. The study combines the evaluation of the surface winds in several Alpine valleys with a more detailed evaluation of the wind evolution throughout the valley depth for a particular site in the Swiss Rhone valley. The former is based on a comparison with observations from the operational measurement network of MeteoSwiss, while the latter uses data from a wind profiler stationed at Sion airport.

How to cite: Schmidli, J. and Ghasemi, A.: Evaluation of thermally driven local winds in the Swiss Alps simulated by a high-resolution NWP model, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5631, https://doi.org/10.5194/egusphere-egu2020-5631, 2020

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