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Influence of grid resolution of large-eddy simulations on foehn-cold pool interaction.

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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Alpine Climatology

Background:

  • Foehn winds are warm, dry downslope winds common in mountainous regions.
  • Cold-air pools (CAPs) are persistent layers of cold air trapped in valleys.
  • Interactions between foehn and CAPs significantly impact local weather patterns.

Purpose of the Study:

  • To investigate the dynamics of a south foehn interacting with a cold-air pool (CAP) in the Inn Valley, Austria.
  • To analyze the conditions leading to foehn breakthroughs into the valley.
  • To understand the turbulent exchange processes at the foehn-CAP interface.

Main Methods:

  • Case study analysis of a specific foehn event (November 3-5, 2017).
  • Utilized data from the Penetration and Interruption of Alpine Foehn (PIANO) field experiment.
  • Examined meteorological data including wind, temperature, and atmospheric structure.

Main Results:

  • Two instances of reversed foehn flow penetrating the Inn Valley near Innsbruck were observed.
  • The second breakthrough event involved westward propagation of the foehn-CAP boundary.
  • Turbulent instabilities at the foehn-CAP interface caused significant heat exchange, with CAP heating potentially overcompensated by advection.

Conclusions:

  • Foehn breakthroughs into valleys with CAPs are complex phenomena influenced by synoptic conditions and local topography.
  • The interaction zone between foehn and CAPs is a site of significant turbulent exchange.
  • Understanding these interactions is crucial for accurate weather forecasting in Alpine regions.