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Journal Articles Bulletin of the American Meteorological Society Year : 2022

A Collaborative Effort to Better Understand, Measure, and Model Atmospheric Exchange Processes over Mountains

Mathias W. Rotach
  • Function : Author
Stefano Serafin
  • Function : Author
Helen C. Ward
  • Function : Author
Marco Arpagaus
  • Function : Author
Ioana Colfescu
  • Function : Author
Joan Cuxart
  • Function : Author
Stephan F. J. de Wekker
  • Function : Author
Vanda Grubišic
  • Function : Author
Norbert Kalthoff
  • Function : Author
Thomas Karl
  • Function : Author
Daniel J. Kirshbaum
  • Function : Author
Manuela Lehner
  • Function : Author
Stephen Mobbs
  • Function : Author
Elisa Palazzi
  • Function : Author
Adriana Bailey
  • Function : Author
Jürg Schmidli
  • Function : Author
Christoph Wittmann
  • Function : Author
Georg Wohlfahrt
  • Function : Author
Dino Zardi
  • Function : Author

Abstract

In this essay, we highlight some challenges the atmospheric community is facing concerning adequate treatment of flows over mountains and their implications for numerical weather prediction (NWP), climate simulations, and impact modeling. With recent increases in computing power (and hence model resolution) numerical models start to face new limitations (such as numerical instability over steep terrain). At the same time there is a growing need for sufficiently reliable NWP model output to drive various impact models (for hydrology, air pollution, agriculture, etc.). The input information for these impact models is largely produced by the boundary layer (BL) parameterizations of NWP models. All known BL parameterizations assume flat and horizontally homogeneous surface conditions, and their performance and interaction with resolved flows is massively understudied over mountains-hence their output may be accidentally acceptable at best. We therefore advocate the systematic investigation of the so-called “mountain boundary layer” (MoBL), introduced to emphasize its many differences to the BL over flat and horizontally homogeneous terrain.
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insu-03863769 , version 1 (08-04-2023)

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Mathias W. Rotach, Stefano Serafin, Helen C. Ward, Marco Arpagaus, Ioana Colfescu, et al.. A Collaborative Effort to Better Understand, Measure, and Model Atmospheric Exchange Processes over Mountains. Bulletin of the American Meteorological Society, 2022, 103, pp.E1282-E1295. ⟨10.1175/BAMS-D-21-0232.1⟩. ⟨insu-03863769⟩
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