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Michael Lehning

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Related publications (173)

Page 8 of 9

Synergistic optimization of renewable energy installations through evolution strategy

Michael Lehning, Jérôme François Sylvain Dujardin, Annelen Kahl

With large parts of the world moving toward renewable energies, there is an urgent need to organize this large-scale transition effectively. This paper presents a new methodology to guide the planning and siting of renewable electricity generation for coun ...

IOP Publishing2021

Influence of air flow features on alpine wind energy potential

Michael Lehning, Wolf Hendrik Huwald, Jérôme François Sylvain Dujardin, Franziska Gerber, Fanny Kristianti

Wind energy is one of the potential options to fill the gap in renewable energy production in Switzerland during the winter season when the energy demand exceeds local production capacities. With likely further rising energy consumption in the future, the ...

Frontiers Media Sa2024

A new ring‐shaped wind tunnel facility to study wind‐packing of snow

Michael Lehning, Charles Fierz, Christian Gabriel Sommer

A new wind tunnel was designed and built at SLF. The facility is ring-shaped to simulate an infinite fetch. This is important for experiments where the observed processes have a slow time scale (minutes to hours). The wind tunnel was developed to study the ...

University de Genève2016

Sensitivity of Alpine3D modeled snow cover to modifications in DEM resolution, station coverage and meteorological input quantities

Michael Lehning, Sebastian Schlögl

This study presents a comprehensive sensitivity and uncertainty assessment of important input parameters on the Alpine3D modeled snow water equivalent (SWE) for two different alpine catchments. Horizontal resolution of the DEM grid, station coverage and se ...

Elsevier2016

Wind tunnel observations of weak and strong snow saltation dynamics

Michael Lehning, Philip Crivelli, Enrico Paterna

Theoretical considerations suggest that saltation dynamics is dominated by either aerodynamic entrainment or by a combination of ejection and rebound at a given time and location. Calling these two regimes weak and strong saltation, respectively, we have i ...

Amer Geophysical Union2017

A Database of Snow on Sea Ice in the Central Arctic Collected during the MOSAiC expedition

Michael Lehning

Snow plays an essential role in the Arctic as the interface between the sea ice and the atmosphere. Optical properties, thermal conductivity and mass distribution are critical to understanding the complex Arctic sea ice system's energy balance and mass dis ...

NATURE PORTFOLIO2023

Sensor Metadata Management and its Application in Collaborative Environmental Research

Karl Aberer, Michael Lehning, Sebastian Michel

This paper considers metadata generation and tracking in a collaborative environment where users publish raw sensor data in the form of virtual sensors and post-process data by means of filtering, modeling, or query processing techniques. In the metadata s ...

2008

How Forward-Scattering Snow and Terrain Change the Alpine Radiation Balance With Application to Solar Panels

Michael Lehning, Annelen Kahl

Rough terrain in mid- and high latitudes is often covered with highly reflective snow, giving rise to a very complex transfer of incident sunlight. In order to simplify the radiative transfer in weather and climate models, snow is generally treated as an i ...

2021

Dataset for: Future water temperature of rivers in Switzerland under climate change investigated with physics-based models

Michael Lehning, Bettina Schaefli, Wolf Hendrik Huwald, Nander Wever, Adrien Michel

This work presents the first extensive study of climate change impacts on rivers temperature in Switzerland. Results show that even for low emissions scenarios, water temperature increase will lead to adverse effect for both ecosystems and socioeconomic se ...

Zenodo2022

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

Quantifying Particle Numbers and Mass Flux in Drifting Snow

Michael Lehning, Philip Crivelli, Enrico Paterna

We compare two of the most common methods of quantifying mass flux, particle numbers and particle-size distribution for drifting snow events, the snow-particle counter (SPC), a laser-diode-based particle detector, and particle tracking velocimetry based on ...

2016

Snowfall and snow accumulation processes during the MOSAiC winter and spring season

Michael Lehning, Marc Schneebeli Zeugin, David Nicholas Wagner, Markus Frey

Data from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition allowed us to investigate the temporal dynamics of snowfall, snow accumulation, and erosion in great detail for almost the whole accumulation season (N ...

2021

How do Stability Corrections Perform in the Stable Boundary Layer Over Snow?

Michael Lehning, Wolf Hendrik Huwald, Sebastian Schlögl

We assess sensible heat-flux parametrizations in stable conditions over snow surfaces by testing and developing stability correction functions for two alpine and two polar test sites. Five turbulence datasets are analyzed with respect to, (a) the validity ...

2017

High resolution static data for WRF over Switzerland

Michael Lehning, Franziska Gerber

Static input data (topography, landuse and soiltype) for the WRF preprocessing system WPS is provided for Switzerland and its neighboring countries between 45-49 N and 4-12 E. The data is provided at a resolution of 1 s. Topography is based on the Aster da ...

2021

Simulation of snow management in Alpine ski resorts using three different snow models

Michael Lehning

Snow management, i. e., snowmaking and grooming, is an integral part of modern ski resort management. While the current snow cover distribution on the slopes is often well known thanks to the usage of advanced monitoring techniques, information about its f ...

ELSEVIER2020

Confirmation of the power gain for solar photovoltaic systems in alpine areas and across scales

Michael Lehning, Ueli Schilt, Yael Frischholz

Introduction: High Alpine regions show a great potential for solar photovoltaic electricity production in winter due to the reflective properties of snow and the larger number of sun hours compared to lower urban and peri-urban regions. In countries with a ...

2024

Bodennahe atmosphärische Prozesse und ihre Wirkung auf die hochalpine Schneedecke

Michael Lehning

The atmospheric boundary layer over mountains shows a wide range of special characteristics, especially when mountains are covered with snow. This contribution discusses how cloud dynamics, prferential deposition and snow transport shape the obeserved high ...

2016

Impact of intercepted and sub-canopy snow microstructure on snowpack response to rain-on-snow events under a boreal canopy

Michael Lehning, Nander Wever, Daniel Nadeau, Adrien Michel

Rain-on-snow events can cause severe flooding in snow-dominated regions. These are expected to become more frequent in the future as climate change shifts the precipitation from snowfall to rainfall. However, little is known about how winter rainfall inter ...

2024

Wind slab formation in snow: experimental setup and first results

Michael Lehning, Charles Fierz, Christian Gabriel Sommer

Geophys . Res. Abstr. 18: EGU2016‐11274. The formation of wind-hardened surface layers, also known as wind slabs or wind crusts, is studied. Better knowledge about which processes and parameters are important will lead to an improved understanding of the m ...

2016

Granulation of snow: From tumbler experiments to discrete element simulations

Michael Lehning, Johan Alexandre Philippe Gaume, Betty Sovilla, Walter Steinkogler

It is well known that snow avalanches exhibit granulation phenomena, i.e., the formation of large and apparently stable snow granules during the flow. The size distribution of the granules has an influence on flow behavior which, in turn, affects runout di ...

2015