Publication
Parameterizing snow saltation: the exponential decay of the mass flux profile and its relation to the saltation dynamics
Related publications (32)
Understanding snow saltation parameterizations: lessons from theory, experiments and numerical simulations
Michael Lehning, Armin Sigmund, Daniela Brito Melo
Drifting and blowing snow are important features in polar and high mountain regions. They control the surface mass balance in windy conditions and influence sublimation of snow and ice surfaces. Despite their importance, model representations in weather an ...
2024Snowfall deposition in mountainous terrain: a statistical downscaling scheme from high-resolution model data on simulated topographies
One of the primary causes of non-uniform snowfall deposition on the ground in mountainous regions is the preferential deposition of snow, which results from the interaction of near-surface winds with topography and snow particles. However, producing high-r ...
Lausanne2024Intermediate complexity atmospheric modeling in complex terrain: is it right?
Michael Lehning, Dylan Stewart Reynolds, Michael Haugeneder
Dynamic downscaling of atmospheric forcing data to the hectometer resolution has shown increases in accuracy for landsurface models, but at great computational cost. Here we present a validation of a novel intermediate complexity atmospheric model, HICAR, ...
Frontiers Media Sa2024Improvements to the dynamic wake meandering model by incorporating the turbulent Schmidt number
Fernando Porté Agel, Peter Andreas Brugger, Corey Dean Markfort
Predictions of the dynamic wake meandering model (DWMM) were compared to flow measurements of a scanning Doppler lidar mounted on the nacelle of a utility-scale wind turbine. We observed that the wake meandering strength of the DWMM agrees better with the ...
2024Turbulence and Heat exchange in the Near-Surface Boundary Layer over Patchy Snow
The atmospheric layer adjacent to the earth's surface is of crucial importance for weather models due to the exchange of energy between the surface and the atmosphere. This exchange is dependent on the various surface properties and influences the state of ...
EPFL2024Good enough: Intermediate complexity atmospheric models improve the representation of processes affecting seasonal snow
Snow plays a crucial role in processes regulating ecosystems, the climate, and human development. Mountain snowpack in particular has great relevance for downstream communities. Knowledge about the distribution and properties of the snowpack thus help in p ...
EPFL2024Comparison of selected surface level ERA5 variables against in‐situ observations in the continental Arctic
Julia Schmale, Jakob Boyd Pernov, Jules Gros-Daillon
In this study, data from 17 ground-based, continental Arctic observatories areused to evaluate the performance of the European Centre for Medium-RangeWeather Forecasts Reanalysis version 5 (ERA5) reanalysis model. Three aspectsare evaluated: (i) the overal ...
2024Towards an improved understanding of wind turbine wakes in complex terrain
In this thesis, we explored the effect of certain terrain-induced flow phenomena on the development of wind turbines sited in complex terrain. A combined experimental and analytical approach is used to study wind turbine wakes in different types of complex ...
EPFL2024Modular Multiplatform Compatible Air Measurement System (MoMuCAMS): a new modular platform for boundary layer aerosol and trace gas vertical measurements in extreme environments
Julia Schmale, Andrea Baccarini, Roman Pohorsky
The Modular Multiplatform Compatible Air Measurement System (MoMuCAMS) is a newly developed in situ aerosol and trace gas measurement platform for lower-atmospheric vertical profiling. MoMuCAMS has been primarily designed to be attached to a Helikite, a ru ...
2024A seasonal snowpack model forced with dynamically downscaled forcing data resolves hydrologically relevant accumulation patterns
Michael Lehning, Dylan Stewart Reynolds, Tobias Jonas
The Mountain snowpack stores months of winter precipitation at high elevations, supplying snowmelt to lowland areas in drier seasons for agriculture and human consumption worldwide. Accurate seasonal predictions of the snowpack are thus of great importance ...
Frontiers Media Sa2024