Publications de Wolf Hendrik Huwald

Banner Cloud Formation at the Matterhorn: Measurements versus Large-Eddy Simulations

Michael Lehning, Wolf Hendrik Huwald, Brandon Jacobus Adrianus Van Schaik

Banner clouds are clouds in the lee of steep mountains or sharp ridges on otherwise cloud-free days. Previous studies identified key mechanisms and preferred flow conditions on the basis of idealized Large-Eddy Simulations, but it remained unclear to what ...

American Meteorological Society2025

The MatterHEX Experiment – Investigating Atmospheric Flow Patterns in Highly Complex Terrain Related to Banner Cloud Formation

Michael Lehning, Wolf Hendrik Huwald, Brandon Jacobus Adrianus Van Schaik

Orographic clouds typically form on the windward side of a topographic barrier when approaching air is cooled as it is lifted, and moisture condenses into cloud droplets. Under special conditions, however, clouds can appear on the leeward side of a mountai ...

American Meteorological Society2025

Influence of air flow features on alpine wind energy potential

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

Quantifying urban climate response to large-scale forcing modified by local boundary layer effects

Michael Lehning, Wolf Hendrik Huwald, Seyed Mahmood Hamze Ziabari

Over the past two decades, the joint manifestation of global warming and rapid urbanization has significantly increased the occurrence of heatwaves and the formation of urban heat islands in temperate cities. Consequently, this synergy has amplified the fr ...

2024

Evidence of Strong Flux Underestimation by Bulk Parametrizations During Drifting and Blowing Snow

Michael Lehning, Wolf Hendrik Huwald, Varun Sharma, Francesco Comola, Koichi Nishimura, Jérôme François Sylvain Dujardin, Daniela Brito Melo, Armin Sigmund

The influence of drifting and blowing snow on surface mass and energy exchange is difficult to quantify due to limitations in both measurements and models, but is still potentially very important over large areas with seasonal or perennial snow cover. We p ...

SPRINGER2023

Combining Weather Station Data and Short-Term LiDAR Deployment to Estimate Wind Energy Potential with Machine Learning: A Case Study from the Swiss Alps

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

Wind energy potential in complex terrain is still poorly understood and difficult to quantify. With Switzerland’s current efforts to shift to renewable energy resources, it is now becoming even more crucial to investigate the hidden potential of wind energ ...

2023

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

Bettina Schaefli, Michael Lehning, 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

Evidence of Strong Flux Underestimation by Bulk Parametrizations During Drifting and Blowing Snow

Michael Lehning, Wolf Hendrik Huwald, Varun Sharma, Francesco Comola, Koichi Nishimura, Jérôme François Sylvain Dujardin, Daniela Brito Melo, Armin Sigmund

The influence of drifting and blowing snow on surface mass and energy exchange is difficult to quantify due to limitations in both measurements and models, but is still potentially very important over large areas with seasonal or perennial snow cover. We p ...

2022

Observations and simulations of new snow density in the drifting snow-dominated environment of Antarctica

Michael Lehning, Wolf Hendrik Huwald, Armin Sigmund

Owing to drifting snow processes, snow accumulation and surface density in polar environments are variable in space and time. We present new field data of manual measurements, repeat terrestrial laser scanning and snow micro-penetrometry from Dronning Maud ...

CAMBRIDGE UNIV PRESS2022

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

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

River ecosystems are highly sensitive to cli-mate change and projected future increase in air tempera-ture is expected to increase the stress for these ecosystems. Rivers are also an important socio-economic factor impact- ing, amongst others, agriculture, ...

2022

Dataset for: Climate change scenarios at hourly time-step over Switzerland from an enhanced temporal downscaling approach

Michael Lehning, Wolf Hendrik Huwald, Varun Sharma, Adrien Michel

In fall 2019, a new set of climate change scenarios has been released for Switzerland, the CH2018 dataset (www.climate-scenarios.ch). The data areprovided at daily resolution. We produced from the CH2018 dataset a new set of climate change scenarios tempor ...

2021

Meteorology and snow transport at S17 near Syowa, Antarctica, in austral summer 2018/2019

Michael Lehning, Wolf Hendrik Huwald, Varun Sharma, Francesco Comola, Jérôme François Sylvain Dujardin, Daniela Brito Melo, Armin Sigmund

This dataset contains measurement and simulation data. The measurements characterize the standard meteorology, turbulence, and snow transport at the S17 site near Syowa Station in East Antarctica during an expedition in austral summer 2018/2019. Large-eddy ...

2021

Climate change scenarios at hourly time‐step over Switzerland from an enhanced temporal downscaling approach

Michael Lehning, Wolf Hendrik Huwald, Varun Sharma, Adrien Michel

Many physically‐based models for climate change impact studies require sub‐daily temporal resolution of the forcing data to provide meaningful predictions. However, climate scenarios are typically available at daily time step, severely limiting the applica ...

2021

Evolution of stream and lake water temperature under climate change

Bettina Schaefli, Alfred Johny Wüest, Damien Bouffard, Wolf Hendrik Huwald, Carl Love Mikael Råman Vinnå, Martin Schmid, Adrien Michel

This report presents past observations and projects the future development of water temperature in Swiss lakes and rivers. Projections are made until the end of the 21st century using the CH2018 climate scenarios. Besides climate change effects on temperat ...

Federal Office for the Environment (FOEN)2021

Stream Temperature Evolution in Switzerland: Recent past and future

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

Climate change has already affected many components of our natural environment which are well described in the literature. Water temperature has received less interest despite the fact that it is recognized as key variable for assessing water quality of fr ...

2020

Radar measurements of blowing snow off a mountain ridge

Michael Lehning, Wolf Hendrik Huwald, Benjamin Andreas Walter, Josué Etienne Gehring

Modelling and forecasting wind-driven redistribution of snow in mountainous regions with its implications on avalanche danger, mountain hydrology or flood hazard is still a challenging task often lacking in essential details. Measurements of drifting and b ...

2020

Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour

Bettina Schaefli, Tristan Jonas Brauchli, Michael Lehning, Wolf Hendrik Huwald, Adrien Michel

Stream temperature and discharge are key hydro- logical variables for ecosystem and water resource management and are particularly sensitive to climate warming. Despite the wealth of meteorological and hydrological data, few studies have quantified observe ...

2020

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

Extracting High Resolution Snow Distribution Information with Inexpensive Autonomous Cameras

Wolf Hendrik Huwald, Steven Vincent Weijs

This study details a procedure to derive high resolution snow cover information using low-cost autonomous cameras. Images from time lapse photography of target areas are used to obtain temporally resolved binary snow-covered area information. Various image ...

EasyChair2018

Influence of slope-scale snowmelt on catchment response simulated with the Alpine3D model

Tristan Jonas Brauchli, Michael Lehning, Wolf Hendrik Huwald, Ernesto Trujillo Gomez

Snow and hydrological modeling in alpine environments remains challenging because of the complexity of the processes affecting the mass and energy balance. This study examines the influence of snowmelt on the hydrological response of a high-alpine catchmen ...

2017