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Michael Lehning

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Publications associées (173)

Use of a multilayer snow model to assess grazing conditions for reindeer

Michael Lehning

High-density snow layers deteriorate grazing conditions for reindeer during winter. We compare two different methods for identifying past winters with difficult grazing conditions for reindeer in Kautokeino, northern Norway. A long-term climate analysis ba ...

Int Glaciol Soc2013

Mapping frequencies of icing on structures in Switzerland

Michael Lehning, Thomas Grünewald, Walter Steinkogler, Philippe Steiner

Icing of structures is a problem for wind energy production in cold regions and makes careful planning of new projects essential. This study presents and evaluates a method to create a map showing the frequency of meteorological icing in Switzerland. Icing ...

2012

Sensitivity of turbulent fluxes to wind speed over snow surfaces in different climatic settings

Michael Lehning

Local wind speed variations influence the energy and mass fluxes over snow through snow accumulation, sublimation of drifting and blowing snow, or variations in turbulent fluxes over static snow and ice surfaces. We use idealized model experiments to analy ...

Elsevier Sci Ltd2012

High-resolution vertical profiles of polarimetric X-band weather radar observables during snowfall in the Swiss Alps

Michael Lehning, Alexis Berne, Marc Schneebeli Zeugin

An X-band polarimetric radar was deployed in the eastern Swiss Alps at an altitude of 2133 m. Radar measurements were complemented with several weather stations deployed in an altitude range from 1500 to 3100 m as well as with a fixed GPS ground station th ...

Amer Meteorological Soc2012

Shear-Stress Partitioning in Live Plant Canopies and Modifications to Raupach's Model

Michael Lehning, Benjamin Andreas Walter

The spatial peak surface shear stress on the ground beneath vegetation canopies is responsible for the onset of particle entrainment and its precise and accurate prediction is essential when modelling soil, snow or sand erosion. This study investigates she ...

Springer Netherlands2012

Automated Model-driven Simulation and Visualization of Field Sensor Data

Karl Aberer, Sofiane Sarni, Marc Parlange, Michael Lehning, Silvia Simoni, Mathias Thierry Pierre Bavay

In the EU project Hydrosys (http://www.hydrosysonline.eu), we have defined and implemented a data processing pipeline that makes simulation process completely automated, fast and transparent to the scientist. Furthermore, our automated simulation tool is f ...

2011

Spatio-temporal measurements and analysis of snow depth in a rock face

Michael Lehning

Snow in rock faces plays a key role in the alpine environment for permafrost distribution, snow water storage or runoff in spring. However, a detailed assessment of snow depths in steep rock walls has never been attempted. To understand snow distribution i ...

2011

Spatio-Temporal Surface Shear-Stress Variability in Live Plant Canopies and Cube Arrays

Michael Lehning, Benjamin Andreas Walter, Katherine Colby Leonard

This study presents spatiotemporally-resolved measurements of surface shear-stress tau (s) in live plant canopies and rigid wooden cube arrays to identify the sheltering capability against sediment erosion of these different roughness elements. Live plants ...

Springer Netherlands2011

Micrometeorological processes driving snow ablation in an Alpine catchment

Michael Lehning, Thomas Grünewald, Mathias Thierry Pierre Bavay

Mountain snow covers typically become patchy over the course of a melting season. The snow pattern during melt is mainly governed by the end of winter snow depth distribution and the local energy balance. The objective of this study is to investigate micro ...

2011

Measurements of surface shear stress distribution in real plant canopies

Michael Lehning, Benjamin Andreas Walter, Katherine Colby Leonard

2011

Effective Metadata Management in Federated Sensor Networks

Karl Aberer, Sofiane Sarni, Michael Lehning, Saket Sathe, Ho Young Jeung, Ioannis Paparrizos

As the Sensor Internet starts to become reality, increasingly heterogeneous sensor networks are becoming interconnected into federated sensor networks and provide huge volumes of sensor data for a variety of applications to large user communities, such as ...

2010

Albedo effect on radiative errors in air temperature measurements

Marc-Olivier Boldi, Marc Parlange, Michael Lehning, Wolf Hendrik Huwald, Chad Higgins

Most standard air temperature measurements are subject to significant errors mainly due to sensor heating by solar radiation, even when the measurement principle is accurate and precise. We present various air temperature measurements together with other m ...

American Geophysical Union2009

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

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