Papers by Frederic Tridon
In this work, we use the combination of an X- band high time and spatial resolution local area we... more In this work, we use the combination of an X- band high time and spatial resolution local area weather radar (typically 30 seconds in time and 60 meters in range and 2° in azimuth up to 20 kilometers) and a K-band vertically looking Micro Rain Radar to study the temporal and spatial heterogeneity of rain and its corresponding drop size
The COPS (Convective Orographically-induced Precipitation Study) international field campaign too... more The COPS (Convective Orographically-induced Precipitation Study) international field campaign took place in the summer of 2007 from June to August, in the region of South-West Germany / North-East France from the Vosges Mountains to the Black Forest Mountains, and across the Rhine Valley. The overall objective of the COPS campaign is to improve the Quantitative Precipitation Forecasts (QPF) skill of Numerical Weather Prediction (NWP) models over mid-range mountainous terrain. To achieve this goal, a large set of in-situ and remote sensing instrumentation was deployed over a series of super sites at selected locations across the domain of interest, while numerous operational and research models were run to assess their performances regarding the studied events observed during Intensive Operation Periods (IOP's). The focus of this presentation is on the preliminary investigation of the relationship that can be found between the precipitation systems, from initiation to decay and i...
Meteorologische Zeitschrift, 2013
Meteorologische Zeitschrift, 2013
ABSTRACT Numerical modelling of the airflow and precipitating convective systems are performed to... more ABSTRACT Numerical modelling of the airflow and precipitating convective systems are performed to better understand the role of topography for the triggering of convection over a moderate mountain region during the Convective and Orographically induced Precipitation Study (COPS) campaign. A non-hydrostatic cloud scale model with two nested domains is used which permits to zoom from the mesoscale environment of south-western Germany/eastern France, into the Vosges Mountains and finally into the small-terrain of the field experiment, increasing the grid resolution to well represent the orography of the region. Using radar observations, a classification of the location of the convection initiation was established during the COPS project, which considers that the convective systems form either on the mountain ridges or on the lee side of the massif. The three simulated cases of this study, corresponding to either position of convection initiation, compare well with available observations of local thermo-dynamical conditions, high resolution X-band radar reflectivity, Vienna Enhanced Resolution Analysis (VERA) of the surface horizontal wind and water vapour retrieval through GPS integrated water vapour 3D tomography. It was found that the convection generation is largely influenced by the Vosges topography. Even for a quite similar synoptic horizontal wind field, the relief acts differently for the studied cases. However, the convective systems are not formed solely by the mountains, but require inputs of moisture, proper stability, and some supportive mesoscale environment. Therefore, their representation in the model requires also a detailed knowledge of the local atmospheric conditions.
Geophysical Research Letters, 2011
… in Vienna, Austria, …, 2010
The international field campaign COPS (Convective and Orographically-induced Precipitation Study,... more The international field campaign COPS (Convective and Orographically-induced Precipitation Study, [1]) took place during the summer 2007 in the low mountain area between southwestern Germany and northeastern France.
Quarterly Journal of the Royal Meteorological Society, 2011
In this work, we investigate the relationship between the structure and evolution (from initiatio... more In this work, we investigate the relationship between the structure and evolution (from initiation to decay) of precipitation systems, and the associated water vapour distributions during the COPS (Convective Orographically-induced Precipitation Study). This international field campaign took place over an area from the Vosges to the Black Forest Mountains, across the Rhine Valley, in summer 2007. In particular, we consider water vapour retrieval through GPS integrated water vapour 2D maps and 3D tomography, and compare these to precipitation systems observed with the ground-based C-band POLDIRAD weather radar.
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Papers by Frederic Tridon