WorldCat Identities

Berne, Alexis

Overview
Works: 27 works in 33 publications in 2 languages and 62 library holdings
Roles: Thesis advisor, dgs, Opponent, Author, Contributor
Publication Timeline
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Most widely held works by Alexis Berne
Unraveling hydrometeor mixtures in polarimetric radar measurements by Nikola Besic( )

2 editions published in 2018 in English and held by 4 WorldCat member libraries worldwide

Characterisation of the melting layer variability in an Alpine valley based on polarimetric X-band radar scans by Floor van den Heuvel( )

2 editions published in 2018 in English and held by 4 WorldCat member libraries worldwide

Multifractal evaluation of simulated precipitation intensities from the COSMO NWP model by Daniel Wolfensberger( )

2 editions published in 2017 in English and held by 4 WorldCat member libraries worldwide

From model to radar variables: a new forward polarimetric radar operator for COSMO by Daniel Wolfensberger( )

2 editions published between 2017 and 2018 in English and held by 4 WorldCat member libraries worldwide

Extension du potentiel de la modélisation hydrologique. : inversions heuristiques de modèles pluie-débit pour l'identification des paramètres simultanément aux pluies ou à la courbe de tarage. by Timothée Michon( )

1 edition published in 2015 in French and held by 3 WorldCat member libraries worldwide

Rainfall-runoff models are used for flood forecasting by warning authorities. However their implementation on a particular territory is still a challenge. Indeed, they generally need to be calibrated by using observed rainfall and discharge time series. These data may be subject to errors and uncertainties. They are not always available. Then, the model calibration relevancy may be affected and the forecasts may also be subject to significant uncertainties. This research would like to address such issues related to the rainfall-runoff models calibration, by proposing original methods which may set up a model by using less data than the ``classical'' calibration. The unused data might be either subject to uncertainties or not available. Moreover, these unused data may be estimated by the methods. Two model independant approach were suggested. Both are an heuristic inversion algorithm of rainfall-runoff models. The first method estimates simultaneously hourly rainfall time series and models parameters, by using only observed hourly discharge time series and total areal rainfall of flood events. A specific application of this method to set up models (with fixed parameters), generalises to models which are not invertible analyticaly, the ``hydrology backward'' approach proposed by Kirchner (2009).The second method estimates simultaneously models parameters and a rating-curve, by using only observed hourly rainfall and stage time series. Original analysis may be performed on the rainfall time series and the rating-curve estimated by the methods. Also, they extend the applicability rainfall-runoff models to hydrological context with restricted available data and offer promising operational applications. Yet, this research lead us to build a conceptual framework, denoted knowledge space. This framework unifies not only the original approaches which were proposed, but also some more ``classical'' approaches to hydrology as the calibration and the simulation
Hydrometeor classification through statistical clustering of polarimetric radar measurements: a semi-supervised approach by Nikola Besic( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Spatial variability of snow precipitation and accumulation in COSMWRF simulations and radar estimations over complex terrain by Franziska Gerber( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Spatial variability in snow precipitation and accumulation in COSMO-WRF simulations and radar estimations over complex terrain by Franziska Gerber( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Polarimetric weather radar : from signal processing to microphysical retrievals( Book )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Mots-clés de l'auteur: precipitation microphysics ; polarimetric radar ; snowfall ; rainfall ; remote sensing
Improved rain rate estimation by combining radars, rain gauges and microwave links( Book )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

Statistical analysis of the spatial and temporal variability of polarimetric weather radar signals in the Alps by Floortje Elisabeth Maria Van den Heuvel( Book )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Mots-clés de l'auteur: Quantitative precipitation estimation ; polarimetric radar ; spatio-temporal variability ; remote sensing
Evaluation of the CloudSat surface snowfall product over Antarctica using ground-based precipitation radars by Niels Souverijns( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Ground-based remote sensing of Antarctic and Alpine solid precipitation by Claudio Durán Alárcon( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Solid precipitation plays an important role in the Earth's climate system, as well as for the maintenance of ecosystems and the development of human society. The large uncertainty in precipitation estimates and the discrepancies within climate model projections make this component of the hydrological cycle important as a research topic. Remote sensing allows to monitor precipitation and clouds in regions where in-situ observations are scarce and scattered, but with limited temporal resolution and a blind zone close to the ground level for spaceborne sensors, and limited visibility in the lower atmosphere in complex terrain for ground-based radars. The objectives of this dissertation are the following: 1) to characterize cloud and precipitation in Antarctica, detecting the presence of supercooled liquid and ice particles near the ground level using a ground-based 532-nm depolarization lidar; 2) to characterize the vertical structure of the precipitation in two contrasted but important regions of the cryosphere, Antarctica and the Alps, in the low troposphere using ground-based radars.In this study, a cloud and precipitation hydrometeor detection method is proposed using lidar data, complemented with a K-band micro rain radar (MRR) to improve the detection of precipitation, both instruments deployed at the Dumont d'Urville (DDU) station in East Antarctica. A method based on lidar depolarization and attenuated backscattering coefficient and the use of k-means clustering is developed for the particle classification. The classification of cloud and precipitation particles provides the vertical distribution of supercooled liquid water, as well as planar oriented ice and randomly oriented ice particles. The comparison between ground-based and satellite-derived classifications shows consistent patterns for the vertical distribution of supercooled liquid water in clouds.The vertical structure of precipitation near the surface is analyzed using the Doppler moments derived from three MRR profiles at DDU, the Princess Elisabeth (PE) station, at the interior of East Antarctica, and at the Col de Porte (CDP) station, in the French Alps. These analyses demonstrate that local climate plays an important role in the vertical structure of the precipitation. In Antarctica, the strong katabatic winds blowing from the high plateau down to the coast decrease the radar reflectivity factor near the surface due to the sublimation of the snowfall particles. Doppler moments also provide rich information to understand precipitation processes, such as aggregation and riming, as observed at DDU and CDP.The results also show that in the interior of the Antarctic continent a significant part (47%) of the precipitation profiles completely sublimate before reaching the surface, due to the dry atmospheric conditions, while in the coast of Antarctica it corresponds to about the third part (36%). In the Alps, this percentage is reduced to 15%. The major occurrence of particle sublimation is observed below the altitude where CloudSat profiles are contaminated by ground clutter. Therefore, this phenomenon cannot be fully captured from space with the current generation of sensors.This dissertation contributes to the study of the vertical structure of snowfall in the low troposphere, useful for the evaluation of precipitation remote sensing products, which may have severe limitations in the vicinity of the surface
A polarimetric radar operator to evaluate precipitation from the COSMO atmospheric model by Daniel Wolfensberger( Book )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Mots-clés de l'auteur: radar ; polarimetric ; COSMO ; numerical weather prediction ; melting layer ; multifractals
Variability of the Rain Drop Size Distribution : Stochastic Simulation and Application to Telecommunication Microwave Links by Marc Schleiss( Book )

2 editions published in 2012 in English and held by 2 WorldCat member libraries worldwide

Microphysics and dynamics of snowfall associated to a warm conveyor belt over Korea by Josué Gehring( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Précipitations méditerranéennes intenses en milieu urbain : interprétation physique et analyse statistique de mesures à fines échelles spatio-temporelles, impact de la variabilité spatiale sur la réponse de bassins versants by Alexis Berne( Book )

2 editions published in 2002 in French and held by 2 WorldCat member libraries worldwide

Les régions du pourtour méditerranéen sont fréquemment soumises à des pluies violentes qui euvent engendrer des crues aux bilans humains et matériels catastrophiques. Ces récipitations onstituent l'objet d'étude de ce travail, qui s'appuie sur les données collectées à l'automne 998 à Marseille dans le cadre de l'expérimentation HIRE 98. L'analyse de mesures de deux adars locaux bande X a fourni des informations sur la pluie dans le plan vertical, notamment ar le profil vertical de réflectivité (PVR). Les structures spatiales et temporelles moyennes aractéristiques des précipitations méditerranéennes intenses sont ensuite estimées à l'aide des esures pluviométriques et radar bande S et bande X, par analyse géostatistique avec le ariogramme en 1 et 2 dimensions. Enfin, la simulation du fonctionnement hydrologique d'un nsemble de 8 bassins versants urbains et péri-urbains permet de quantifier l'impact de la ariabilité spatiale de la pluie sur les débits générés
Three-dimensional radiative transfer effects on airborne, satellite and ground-based trace gas remote sensing by Marc Schwaerzel( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Variability of the raindrop size distribution across scales in Mediterranean rainfall : characterisation and stochastic simulation by Timothy Hugh Raupach( Book )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Mots-clés de l'auteur: precipitation microstructure ; precipitation variability ; drop size distribution (DSD) ; stochastic simulation
Correction of CCI cloud data over the Swiss Alps using ground-based radiation measurements by Fanny Jeanneret( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

 
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Languages
English (23)

French (3)