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Michael Lehning

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Publications associées (173)

Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

Marc Parlange, Michael Lehning, Marco Giovanni Giometto, Francesco Comola

Preferential deposition of snow and dust over complex terrain is responsible for a wide range of environmental processes and accounts for a significant source of uncertainty in the surface mass balances of cold and arid regions. Despite the growing body of ...

2019

Understanding snow bedform formation by adding sintering to a cellular automata model

Michael Lehning, Varun Sharma, Louise Braud

Cellular-automata-based modelling for simulating snow bedforms and snow deposition is introduced in this study. The well-known ReSCAL model, previously used for sand bedforms, is adapted for this purpose by implementing a simple sintering mechanism. The ef ...

Copernicus GmbH2019

The European mountain cryosphere: a review of its current state, trends, and future challenges

Michael Lehning, Wolf Hendrik Huwald

The mountain cryosphere of mainland Europe is recognized to have important impacts on a range of environmental processes. In this paper, we provide an overview on the current knowledge on snow, glacier, and permafrost processes, as well as their past, curr ...

2018

Dataset on PV Production in Snow Covered Mountains

Michael Lehning, Annelen Kahl, Jérôme François Sylvain Dujardin

The SUNWELL Modelling Environment is a combination of data and code that models electricity production from satellite-derived irradiance data and other spatial data sets for all of Switzerland. This ensemble accompanies the publication "The bright side of ...

2018

On the suitability of the Thorpe-Mason model for calculating sublimation of saltating snow

Michael Lehning, Varun Sharma, Francesco Comola

The Thorpe and Mason (TM) model for calculating the mass lost from a sublimating snow grain is the basis of all existing small-and large-scale estimates of drifting snow sublimation and the associated snow mass balance of polar and alpine regions. We revis ...

COPERNICUS GESELLSCHAFT MBH2018

Hydrological response of two high altitude Swiss catchments to energy balance and temperature index melt schemes

Michael Lehning, Alice Marie Burri, Francesco Comola, Abdul Shakoor, Mathias Thierry Pierre Bavay

2018

How Are Turbulent Sensible Heat Fluxes and Snow Melt Rates Affected by a Changing Snow Cover Fraction?

Michael Lehning

The complex interaction between the atmospheric boundary layer and the heterogeneous land surface is typically not resolved in numerical models approximating the turbulent heat exchange processes. In this study, we consider the effect of the land surface h ...

FRONTIERS MEDIA SA2018

Representation of Horizontal Transport Processes in Snowmelt Modeling by Applying a Footprint Approach

Michael Lehning, Sebastian Schlögl, Charles Fierz

The energy balance of an alpine snow cover significantly changes once the snow cover gets patchy. The local advection of warm air causes above-average snow ablation rates at the upwind edge of the snow patch. As lateral transport processes are typically no ...

FRONTIERS MEDIA SA2018

Wind Tunnel Experiments: Influence of Erosion and Depositionon Wind-Packing of New Snow

Michael Lehning, Christian Gabriel Sommer, Charles Fierz

2018

Near-surface ventilation as a key for modeling the thermal regime of coarse blocky rock glaciers

Michael Lehning

2018

Snow farming: conserving snow over the summer season

Michael Lehning, Thomas Grünewald

2018

Improvement of Wind Power Assessment in Complex Terrain: The Case of COSMO-1 in the Swiss Alps

Michael Lehning, Albertus Christiaan Kruyt, Jérôme François Sylvain Dujardin

This work contains a series of calculations that explore the wind power potential in Switzerland using the Numerical Weather Prediction model COSMO-1. The model's performance was validated in complex terrain by comparing the modeled hourly wind speed to we ...

FRONTIERS MEDIA SA2018

Charting the course: A possible route to a fully renewable Swiss power system

Pedro Filipe De Almeida Manso, Michael Lehning, Albertus Christiaan Kruyt, Stuart John Bartlett, Annelen Kahl, Jérôme François Sylvain Dujardin

The prospect of a renewable transition seems plausible for many countries, but can be shrouded in risks, costs and challenges. This paper illuminates a path for such a transition with a numerical investigation, aimed at resolving the power dynamics of a co ...

2018

Is the Thorpe and Mason model valid for drifting and blowing snow?

Michael Lehning, Varun Sharma, Francesco Comola

Sublimation of drifting and blowing snow has been recognized as an important component of the surface mass budget of polar and alpine regions. The Thorpe and Mason (TM) model is the basis of all existing small and largescale estimates of drifting snow sub ...

Copernicus2018

Investigation of a wind-packing event in Queen Maud Land, Antarctica

Michael Lehning, Christian Gabriel Sommer, Nander Wever, Charles Fierz

Surface snow in polar and mountainous regions is often mobile and this mobility influences surface mass balance and isotopic composition before final deposition, which is poorly understood thus far. In December 2016 and January 2017, during a field campaig ...

COPERNICUS GESELLSCHAFT MBH2018

Spatial variability in snow precipitation and accumulation in COSMO–WRF simulations and radar estimations over complex terrain

Michael Lehning, Alexis Berne, Varun Sharma, Franziska Gerber, Nikola Besic, Marco Gabella, Urs Martin Germann

Snow distribution in complex alpine terrain and its evolution in the future climate is important in a variety of applications including hydropower, avalanche forecasting and freshwater resources. However, it is still challenging to quantitatively forecast ...

2018

Firn Meltwater Retention on the Greenland Ice Sheet: A Model Comparison

Michael Lehning, Nander Wever

Runoff has recently become the main source of mass loss from the Greenland Ice Sheet and is an important contributor to global sea level rise. Linking runoff to surface meltwater production is complex, as meltwater can be retained within the firn by refree ...

Frontiers Media Sa2017

How much can we save? Impact of different emission scenarios on future snow cover in the Alps

Michael Lehning, Sebastian Schlögl, Mathias Thierry Pierre Bavay

This study focuses on an assessment of the future snow depth for two larger Alpine catchments. Automatic weather station data from two diverse regions in the Swiss Alps have been used as input for the Alpine3D surface process model to compute the snow cove ...

Copernicus GmbH2017

Distributed snow and rock temperature modelling in steep rock walls using Alpine3D

Michael Lehning, Nander Wever, Mathias Thierry Pierre Bavay

In this study we modelled the influence of the spatially and temporally heterogeneous snow cover on the surface energy balance and thus on rock temperatures in two rugged, steep rock walls on the Gemsstock ridge in the central Swiss Alps. The heterogeneous ...

Copernicus GmbH2017

A close-ridge small-scale atmospheric flow field and its influence on snow accumulation

Michael Lehning, Franziska Gerber, Sebastian Wilhelm Hoch

The rough, steep, and complex terrain in the alpine environment causes a variety of flow patterns such as blocking, speed-up, or flow separation, which influence precipitation, snow deposition, and ultimately snow distribution on the ground. Cloud-terrain ...

Amer Geophysical Union2017

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