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Start Over Author "Flamant, Cyrille" Journal quarterly journal of the royal meteorological society
20 results on '"Flamant, Cyrille"'

8. A multi-instrument and multi-model assessment of atmospheric moisture variability over the western Mediterranean during HyMeX.

Author

Chazette, Patrick, Flamant, Cyrille, Shang, Xiaoxia, Totems, Julien, Raut, Jean‐Christophe, Doerenbecher, Alexis, Ducrocq, Véronique, Fourrié, Nadia, Bock, Olivier, and Cloché, Sophie

Subjects
*HYDROLOGIC cycle, *MEDITERRANEAN climate, *METEOROLOGICAL observations, *LIDAR, *ATMOSPHERIC water vapor
Abstract

The Hydrological cycle in the Mediterranean eXperiment ( HyMeX) was held in autumn 2012 during which part of the observational effort was established on Menorca Island to characterize the upwind marine low-level flow. The ground-based Water-vapour Raman Lidar ( WALI), the airborne water-vapour lidar LEANDRE 2 and boundary-layer pressurized balloons were implemented during the first Special Observing Period and contributed to characterize water vapour variability in the vicinity of the Balearic Islands, together with the existing network of Global Positioning System receivers. Furthermore, analyses from regional and global numerical weather prediction ( NWP) models ( AROME-WMED, the ECMWF/ IFS NWP system and the Weather Research and Forecasting ( WRF) model) were also available over large domains encompassing part of or the entire western Mediterranean basin. We assess the consistency of water vapour mixing ratio ( WVMR) profiles and integrated water vapour contents ( IWVC) derived from the different datasets by comparing them to a common reference, the ground-based lidar WALI. We use consistency indicators such as root-mean-square errors, biases and correlations. Comparison between WVMR profiles from ground-based and airborne lidars (ground-based lidar and boundary-layer pressurized balloons) leads to a root-mean-square error lower than 1.6 g kg−1 (1.3 g kg−1) when the closest possible air masses are sampled. We observed a good agreement between the vertical WVMR profiles derived from WALI and the numerical models with correlations higher than 0.7 and root-mean-square errors lower than 2 g kg−1. Regarding IWVCs, the models exhibit biases less than 2 kg m−2, root-mean-square errors lower than 2.3 g kg−1 and correlations higher than 0.86 when compared to WALI. Finally, AROME-WMED 48 h forecasts were compared with WALI data composited over eleven 48 h periods. The quality of the forecast does not visibly degrade within the 48 h period from the initial analyses. [ABSTRACT FROM AUTHOR]

Published
2016
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9. Tropical moisture enriched storm tracks over the Mediterranean and their link with intense rainfall in the Cevennes-Vivarais area during HyMeX.

Author

Chazette, Patrick, Flamant, Cyrille, Raut, Jean‐Christophe, Totems, Julien, and Shang, Xiaoxia

Subjects
*METEOROLOGICAL observations, *MEDITERRANEAN climate, *HYDROLOGIC cycle, *RADAR -- Optical equipment, *MODIS (Spectroradiometer)
Abstract

During the Intensive Observing Period 15b of the first Special Observation Period of the Hydrological Cycle in the Mediterranean Experiment ( HyMeX), a variety of mesoscale convective systems ( MCSs) impacted the Cevennes-Vivarais ( CV) target area leading to over 100 mm of 24 h accumulated rainfall on 20 and 21 October 2012. The CV area was first impacted by a V-shaped MCS developing over the Cevennes mountains, then by a MCS initiated on the eastern foothills of the Pyrenees and finally by three MCSs initiating over the sea. The MCSs initiated and propagated along a well-defined storm track ahead of an approaching upper-level trough, as observed with the 15 min resolution Spinning Enhanced Visible and Infrared Imager. The storm track was characterized by strong southeasterly winds over the Mediterranean and high integrated water vapour content ( IWVC), as derived from observations from the Moderate-resolution Imaging Spectroradiometer ( MODIS) and the Atmospheric Infrared Sounder ( AIRS). The ground-based Water-vapour Raman Lidar, located in the Balearic Islands, captured the increasing moistening of the free troposphere, up to 5 km, associated with the eastward propagation of the surface low from Gibraltar to a location west of the Balearic Islands. MODIS and AIRS observations, together with Weather Research and Forecasting ( WRF) model simulations, revealed the tropical origin of the high moisture content characterizing the storm track, with IWVC values on the order of 35 kg m−2, and enhanced moisture being observed below 500 hPa. The WRF simulations also showed that the MCS initiation offshore was very likely caused by low-level wind convergence and conditionally unstable air along the storm track, between North Africa and southern France. Low-level convergence resulted from the interaction between a strong southwesterly swirling flow around the low-pressure centre and an easterly low-level jet present along the southern France coastline. [ABSTRACT FROM AUTHOR]

Published
2016
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10. Processes leading to heavy precipitation associated with two Mediterranean cyclones observed during the HyMeX SOP1.

Author

Flaounas, Emmanouil, Lagouvardos, Konstantinos, Kotroni, Vassiliki, Claud, Chantal, Delanoë, Julien, Flamant, Cyrille, Madonna, Erica, and Wernli, Heini

Subjects
CYCLONES, METEOROLOGICAL observations, METEOROLOGICAL precipitation, MEDITERRANEAN climate, HYDROLOGIC cycle, CONVECTION (Meteorology)
Abstract

Two deep cyclones occurred in the Mediterranean between 25 and 31 October 2012, during the first Special Observation Period (SOP1) of the Hydrological cycle in the Mediterranean Experiment (HyMeX). Both cyclones were associated with extreme rainfall covering a large part of the western Mediterranean Sea, where 24 h accumulated precipitation measurements exceeded 150 mm. We combine complementary observations from airborne radar and lidar systems, ZEUS lightning detection network and meteorological surface stations along with satellite diagnostics on deep convection, for a detailed microphysics and (thermo-)dynamical analysis of the two extreme rainfall cases. In addition, we use operational analysis data from the European Centre for Medium-range Weather Forecasts (ECMWF) for analysing the synoptic conditions and diagnosing strongly ascending air masses in the vicinity of the cyclones, so-called warm conveyor belts (WCBs). The analysis revealed the different physical characteristics of the two cyclones responsible for the extreme rainfalls. Both cyclones were associated with a WCB and a comma cloud, but deep convection, intense lightning and very cold cloud tops occurred only for the first case while the second cyclone was mostly associated with stratiform rainfall, a strong WCB, and only a few embedded cells of deep convection. [ABSTRACT FROM AUTHOR]

Published
2016
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13. Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS)

Author

Chaboureau, Jean‐Pierre, primary, Richard, Evelyne, additional, Pinty, Jean‐Pierre, additional, Flamant, Cyrille, additional, Di Girolamo, Paolo, additional, Kiemle, Christoph, additional, Behrendt, Andreas, additional, Chepfer, Hélène, additional, Chiriaco, Marjolaine, additional, and Wulfmeyer, Volker, additional

Published
2011
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14. Initiation of deep convection at marginal instability in an ensemble of mesoscale models: a case‐study from COPS

Author

Barthlott, Christian, primary, Burton, Ralph, additional, Kirshbaum, Daniel, additional, Hanley, Kirsty, additional, Richard, Evelyne, additional, Chaboureau, Jean‐Pierre, additional, Trentmann, Jörg, additional, Kern, Bastian, additional, Bauer, Hans‐Stefan, additional, Schwitalla, Thomas, additional, Keil, Christian, additional, Seity, Yann, additional, Gadian, Alan, additional, Blyth, Alan, additional, Mobbs, Stephen, additional, Flamant, Cyrille, additional, and Handwerker, Jan, additional

Published
2011
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15. The Convective and Orographically-induced Precipitation Study (COPS): the scientific strategy, the field phase, and research highlights

Author

Wulfmeyer, Volker, primary, Behrendt, Andreas, additional, Kottmeier, Christoph, additional, Corsmeier, Ulrich, additional, Barthlott, Christian, additional, Craig, George C., additional, Hagen, Martin, additional, Althausen, Dietrich, additional, Aoshima, Fumiko, additional, Arpagaus, Marco, additional, Bauer, Hans-Stefan, additional, Bennett, Lindsay, additional, Blyth, Alan, additional, Brandau, Christine, additional, Champollion, Cédric, additional, Crewell, Susanne, additional, Dick, Galina, additional, Di Girolamo, Paolo, additional, Dorninger, Manfred, additional, Dufournet, Yann, additional, Eigenmann, Rafael, additional, Engelmann, Ronny, additional, Flamant, Cyrille, additional, Foken, Thomas, additional, Gorgas, Theresa, additional, Grzeschik, Matthias, additional, Handwerker, Jan, additional, Hauck, Christian, additional, Höller, Hartmut, additional, Junkermann, Wolfgang, additional, Kalthoff, Norbert, additional, Kiemle, Christoph, additional, Klink, Stefan, additional, König, Marianne, additional, Krauss, Liane, additional, Long, Charles N., additional, Madonna, Fabio, additional, Mobbs, Stephen, additional, Neininger, Bruno, additional, Pal, Sandip, additional, Peters, Gerhard, additional, Pigeon, Grégoire, additional, Richard, Evelyne, additional, Rotach, Mathias W., additional, Russchenberg, Herman, additional, Schwitalla, Thomas, additional, Smith, Victoria, additional, Steinacker, Reinhold, additional, Trentmann, Jörg, additional, Turner, David D., additional, van Baelen, Joel, additional, Vogt, Siegfried, additional, Volkert, Hans, additional, Weckwerth, Tammy, additional, Wernli, Heini, additional, Wieser, Andreas, additional, and Wirth, Martin, additional

Published
2011
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18. Gap flows: Results from the Mesoscale Alpine Programme

Author

Mayr, Georg J., primary, Armi, Laurence, additional, Gohm, Alexander, additional, Zängl, Günther, additional, Durran, Dale R., additional, Flamant, Cyrille, additional, Gaberšek, Saša, additional, Mobbs, Stephen, additional, Ross, Andrew, additional, and Weissmann, Martin, additional

Published
2007
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19. Föhn in the Rhine Valley during MAP: A review of its multiscale dynamics in complex valley geometry

Author

Drobinski, Philippe, primary, Steinacker, Reinhold, additional, Richner, Hans, additional, Baumann-Stanzer, Kathrin, additional, Beffrey, Guillaume, additional, Benech, Bruno, additional, Berger, Heinz, additional, Chimani, Barbara, additional, Dabas, Alain, additional, Dorninger, Manfred, additional, Dürr, Bruno, additional, Flamant, Cyrille, additional, Frioud, Max, additional, Furger, Markus, additional, Gröhn, Inga, additional, Gubser, Stefan, additional, Gutermann, Thomas, additional, Häberli, Christian, additional, Häller-Scharnhost, Esther, additional, Jaubert, Geneviève, additional, Lothon, Marie, additional, Mitev, Valentin, additional, Pechinger, Ulrike, additional, Piringer, Martin, additional, Ratheiser, Matthias, additional, Ruffieux, Dominique, additional, Seiz, Gabriela, additional, Spatzierer, Manfred, additional, Tschannett, Simon, additional, Vogt, Siegfried, additional, Werner, Richard, additional, and Zängl, Günther, additional

Published
2007
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