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Alexis Berne

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Publications associées (135)

Solid hydrometeor classification and riming degree estimation from pictures collected with a Multi-Angle Snowflake Camera

Alexis Berne, Christophe Praz

A new method to automatically classify solid hydrometeors based on Multi-Angle Snowflake Camera (MASC) images is presented. For each individual image, the method relies on the calculation of a set of geometric and texture-based descriptors to simultaneousl ...

2017

Measurements of precipitation in Dumont d'Urville, Adelie Land, East Antarctica

Alexis Berne, Jacopo Grazioli

The first results of a campaign of intensive observation of precipitation in Dumont d'Urville, Antarctica, are presented. Several instruments collected data from November 2015 to February 2016 or longer, including a polarimetric radar (MXPol), a Micro Rain ...

Copernicus GmbH2017

Hydrometeor classification through statistical clustering of polarimetric radar measurements: a semi-supervised approach

Alexis Berne, Jacopo Grazioli, Nikola Besic, Marco Gabella, Urs Martin Germann

Polarimetric radar-based hydrometeor classification is the procedure of identifying different types of hydrometeors by exploiting polarimetric radar observations. The main drawback of the existing supervised classification methods, mostly based on fuzzy lo ...

Copernicus GmbH2016

Multiregional Satellite Precipitation Products Evaluation over Complex Terrain

Alexis Berne

An extensive evaluation of nine global-scale high-resolution satellite-based rainfall (SBR) products is performed using aminimumof 6 years (within the period of 2000-13) of reference rainfall data derived from rain gauge networks in nine mountainous region ...

American Meteorological Society2016

Spatial interpolation of experimental raindrop size distribution spectra

Alexis Berne, Timothy Hugh Raupach

We present a new approach for spatial interpolation of experimental raindrop size distribution (DSD) spectra. The DSD is fundamental to the study and understanding of precipitation and its monitoring and modelling. It is measured insitu using disdrometers ...

Wiley-Blackwell2016

A radar-based regional extreme rainfall analysis to derive the thresholds for a novel automatic alert system in Switzerland

Alexis Berne, Luca Panziera, Marco Gabella, Urs Martin Germann

This paper presents a regional extreme rainfall analysis based on 10 years of radar data for the 159 regions adopted for official natural hazard warnings in Switzerland. Moreover, a nowcasting tool aimed at issuing heavy precipitation regional alerts is in ...

Copernicus GmbH2016

Small-Scale Variability of the Raindrop Size Distribution and Its Effect on Areal Rainfall Retrieval

Alexis Berne, Timothy Hugh Raupach

The drop size distribution (DSD) describes the microstructure of liquid precipitation. The high variability of the DSD reflects the variety of microphysical processes controlling raindrop properties and affects the retrieval of rainfall. An analysis of the ...

American Meteorological Society2016

Increasing the Perspectives of Engineering Undergraduates on Societal Issues through an Interdisciplinary Program

Ambrogio Fasoli, Denis Gillet, Antonin Danalet, Ingrid Le Duc, Alexis Berne, Luca Bragazza, Delphine Preissmann, Samuel Bendahan, Siara Ruth Isaac, Roland John Tormey, Jérome Feige, Isabelle Barbara Marie-Hélène Cardia, Adrian Christian Holzer

To tackle the challenges of the 21st century, future scientists and engineers have to understand the interplay between societal challenges and technical solutions as early as possible in their education. They also have to develop the communication and the ...

Tempus Publications2016

Detection and characterization of the melting layer based on polarimetric radar scans

Alexis Berne, Daniel Wolfensberger, Danny Eddy Scipion Castillo

Stratiform rain situations are generally associated with the presence of a melting layer characterized by a strong signature in polarimetric radar variables. This layer is an important feature as it indicates the transition from solid to liquid precipitati ...

Wiley-Blackwell2016

Hydrometeor classification from polarimetric radar measurements: a clustering approach

Devis Tuia, Alexis Berne, Jacopo Grazioli

A data-driven approach to the classification of hydrometeors from measurements collected with polarimetric weather radars is proposed. In a first step, the optimal number of hydrometeor classes (nopt) that can be reliably identified from a large set of pol ...

Copernicus Gesellschaft Mbh2015

Correction of raindrop size distributions measured by Parsivel disdrometers, using a two-dimensional video disdrometer as a reference

Alexis Berne, Timothy Hugh Raupach

The raindrop size distribution (DSD) quantifies the microstructure of rainfall and is critical to studying precipitation processes. We present a method to improve the accuracy of DSD measurements from Parsivel (particle size and velocity) disdrometers, usi ...

European Geosciences Union2015

Multifrequency Radar Observations Collected In Southern France During Hymex-Sop1

John Beck, Alexis Berne, Jacopo Grazioli, Danny Eddy Scipion Castillo

American Meteorological Society2015

Monitoring and prediction in Early Warning Systems (EWS) for rapid mass movements

Marc Schleiss, Dani Or, Alexis Berne, Alessio Ferrari

Rapid mass movements (RMM) pose a substantial risk to people and infrastructure. Reliable and cost-efficient measures have to be taken to reduce this risk. One of these measures includes establishing and advancing the State of Practice in the application o ...

Copernicus Publications2015

2DVD Data Revisited: Multifractal Insights into Cuts of the Spatiotemporal Rainfall Process

Alexis Berne

Data collected during four heavy rainfall events that occurred in Ardeche (France) with the help of a 2D video disdrometer (2DVD) are used to investigate the structure of the raindrop distribution in both space and time. A first type of analysis is based o ...

American Meteorological Society2015

Polarimetric radar and in situ observations of riming and snowfall microphysics during CLACE 2014

Alexis Berne, Jacopo Grazioli, Luca Panziera

This study investigates the microphysics of winter alpine snowfall occurring in mixed-phase clouds in an inner-Alpine valley during January and February 2014. The available observations include high-resolution polarimetric radar and in situ measurements of ...

Copernicus Publications2015

Stochastic simulation of intermittent rainfall using the concept of “dry drift”

Marc Schleiss, Alexis Berne, Sabine Chamoun

A stochastic rainfall simulator based on the concept of “dry drift” is proposed. It is characterized by a new and nonstationary representation of rainfall in which the average rain rate (in log-space) depends on the distance to the closest surrounding dry ...

American Geophysical Union2014

Nonstationarity in Intermittent Rainfall: The “Dry Drift"

Marc Schleiss, Alexis Berne, Sabine Chamoun

A particular aspect of the nonstationary nature of intermittent rainfall is investigated. It manifests itself in the fact that the average rain rate varies with the distance to the surrounding dry areas. The authors call this fundamental link between the r ...

2014

Accuracy of Phase-Based Algorithms for the Estimation of the Specific Differential Phase Shift Using Simulated Polarimetric Weather Radar Data

Alexis Berne, Marc Schneebeli Zeugin, Jacopo Grazioli

The specific differential phase shift on propagation K-dp is widely employed in the study of precipitation, although little is known about the effective accuracy of its estimates. The aim of this letter is to analyze the quality of K-dp estimates, using re ...

Ieee-Inst Electrical Electronics Engineers Inc2014

HYMEX-SOPI The Field Campaign Dedicated to Heavy Precipitation and Flash Flooding in the Northwestern Mediterranean

Alexis Berne

The Mediterranean region is frequently affected by heavy precipitation events associated with flash floods, landslides, and mudslides that cause hundreds of millions of euros in damages per year and, often, casualties. A major field campaign was devoted to ...

American Meteorological Society2014

Improved Estimation of the Specific Differential Phase Shift Using a Compilation of Kalman Filter Ensembles

Alexis Berne, Marc Schneebeli Zeugin, Jacopo Grazioli

A new algorithm for the accurate estimation of the specific differential phase shift on propagation (K-dp) from noisy total differential phase shift (Psi(dp)) measurements is presented for data acquired with a polarimetric weather radar. The new approach, ...

Institute of Electrical and Electronics Engineers2014

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