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Auteur Cédric Champollion |
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Affiner la recherche Interroger des sources externesComparison of IASI water vapour products over complex terrain with COPS campaign data / Guido Masiello in Meteorologische Zeitschrift, vol 22 n° 4 (August 2013)
Titre : Comparison of IASI water vapour products over complex terrain with COPS campaign data Type de document : Article/Communication Auteurs : Guido Masiello, Auteur ; Carmine Serio, Auteur ; Thomas Deleporte, Auteur ; Hervé Herbin, Auteur ; Paolo Di Girolamo, Auteur ; Cédric Champollion, Auteur ; Andreas Behrendt, Auteur ; Pierre Bosser Année de publication : 2013 Article en page(s) : pp 471 - 487 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] image MetOp-IASI
[Termes IGN] lidar Raman
[Termes IGN] positionnement par GPS
[Termes IGN] Rhin (bassin)
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] troposphèreRésumé : (auteur) In this work, we compare IASI-retrieved vertical water vapour profiles and related precipitable water over a complex region, namely the Rhine Valley area, during the pre-operational period of IASI exploitation (June–August 2007). Both IASI water vapour mixing ratio profiles and integrated water vapour content are retrieved from L1C radiances spectra using two techniques and compared with water vapour related observations acquired during the Convective and Orographically-induced Precipitation Study (COPS) field campaign that took place in this area at that time (i.e. lidars, radiosoundings and a global positioning system - GPS - station network). This work addresses the issue of IASI vertical spatial resolution and its capability to detect two-layer water vapour structures such as those observed in a mountainous area and which play an important role in convective initiation or inhibition. We found that this capability mostly relies on the type of a-priori background vector (climatology or space-time colocated ECMWF analysis), which is used within the retrieval scheme. Systematic comparison of water vapour products derived from 71 IASI spectra confirms that IASI can retrieve water vapour amounts in 2 km width layers, in the lower troposphere, with an accuracy of approximately 10%. Numéro de notice : A2013-817 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1127/0941-2948/2013/0430 Date de publication en ligne : 01/08/2013 En ligne : http://dx.doi.org/10.1127/0941-2948/2013/0430 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80103
in Meteorologische Zeitschrift > vol 22 n° 4 (August 2013) . - pp 471 - 487[article]
Titre : Water vapour variability induced by urban/rural surface heterogeneities during convective conditions Type de document : Article/Communication Auteurs : Cédric Champollion, Auteur ; Philippe Drobinski, Auteur ; M. Haeffelin, Auteur ; Olivier Bock Année de publication : 2009 Projets : 3-projet - voir note / Article en page(s) : pp 1266 - 1276 Note générale : bibliographie
This research has been funded by the Centre National de la Recherche Scientifique (CNRS), the Direction Générale de l’Armement (DGA) and the Ecole Polytechnique as well as the Institut des Sciences de l’Univers (INSU) through the Programme Atmosphère Ocean à Multiéchelle (PATOM) and Programme National de Télédétection Spatiale (PNTS)Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] coordonnées GPS
[Termes IGN] météorologie locale
[Termes IGN] Paris (75)
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] teneur intégrée en vapeur d'eau
[Termes IGN] zone urbaineRésumé : (auteur) Scientific interest in urban meteorology has increased because highly populated areas experience high vulnerability to pollution or heavy rain. However, compared to urban air quality or urban heat island (UHI) processes, the urban water vapour cycle is poorly understood because it has been investigated less due to the lack of upper‐air measurements and the high sensitivity of surface measurements to local heterogeneities. In this paper, surface measurements of wind, temperature, pressure and humidity, as well as integrated water vapour (IWV) from GPS and MODIS and numerical simulations, have been used to investigate the urban cycle of water vapour in May and June 2004 during the VAPIC field experiment in the Paris area.
The surface data show the typical characteristics of an urban area with the absence of water vapour sources and a UHI of about 6 °C at night. The urban IWV distribution differs completely, with an urban IWV excess on average between 1600 and 0600 UTC (with a maximum of about 1.5 kg m−2 at 0600 and 1700 UTC). No IWV difference between the urban and rural areas is found in the middle of the day. The numerical simulations reproduce accurately the urban IWV anomaly.
Shallow surface wind convergence associated with the UHI during nighttime provides moisture from the rural areas. Urban areas are therefore under wind convergence for most of the time. The rural water vapour sources and the depth of the convergence control the amplitude of the urban IWV excess. At about 1200 UTC, entrainment at the top of the urban boundary layer is the key process that inhibits the urban IWV excess observed at night.Numéro de notice : A2009-589 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/qj.446 Date de publication en ligne : 10/07/2009 En ligne : https://doi.org/10.1002/qj.446 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96192
in Quarterly Journal of the Royal Meteorological Society > vol 135 n° 642 (July 2009 Part A) . - pp 1266 - 1276[article]
Titre : Mesoscale GPS tomography applied to the 12 June 2002 convective initiation event of IHOP_2002 Type de document : Article/Communication Auteurs : Cédric Champollion, Auteur ; Cyrille Flamant, Auteur ; Olivier Bock Année de publication : 2009 Projets : 3-projet - voir note / Article en page(s) : pp 645 - 662 Note générale : bibliographie
This work was partially supported by the PATOM of the CNRS and via grant DE-FG02-08ER64538 from the U.S. Department of Energy as part of the ARM program.Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] coordonnées GPS
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] tomographie par GPSRésumé : (auteur) The time‐varying three‐dimensional water vapour field derived from mesoscale Global Positioning System (GPS) tomography data is used to describe the water vapour variability in relation to the dynamics of the atmosphere during convective initiation (CI). The paper presents the theoretical framework of GPS tomography at the mesoscale, including aspects related to the assimilation of independent data (e.g. water vapour profiles issued from meteorological balloon soundings). GPS tomography‐derived water vapour density retrievals are validated against lidar, the Atmospheric Emitted Radiance Interferometer and radiosonde data, even if the short three‐day period of the study prevents conclusions about the real accuracy of the GPS tomography technique.
GPS tomography products are used, in synergy with surface and sounding‐derived meteorological variable measurements, satellite imagery and reflectivity composites from the WSR‐88D network and S‐POL radar, to study environmental conditions leading to the 12 June 2002 CI event during the International H2O Project. On this day, CI was triggered simultaneously, shortly after 2100 UTC, in two locations along an old outflow boundary lying east‐west in the vicinity of the Oklahoma–Kansas border. The study focuses on CI to the east, which was triggered at the intersection of the outflow boundary with a distinct southwest–northeast‐oriented moisture convergence line. The latter formed as the result of a cross‐dryline circulation leading to the penetration of dry air meeting with the moister air mass associated with the southerly low‐level flow east of the dryline. These intersecting boundaries appeared to have provided the necessary triggering mechanism for getting moist surface air parcels up to the level of free convection. Tomography‐derived water vapour fields provided observational evidence of the vertical transport of water vapour above the lifting condensation level and the level of free convection to the south of and along the intersecting boundaries.Numéro de notice : A2009-573 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/qj.386 Date de publication en ligne : 25/03/2009 En ligne : https://doi.org/10.1002/qj.386 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96188
in Quarterly Journal of the Royal Meteorological Society > vol 135 n° 640 (April 2009 part A) . - pp 645 - 662[article]
Titre : La campagne Cops : genèse et cycle de vie de la convection en région montagneuse Type de document : Article/Communication Auteurs : Evelyne Richard, Auteur ; Cyrille Flamant, Auteur ; François Bouttier, Auteur ; J. van Baelen, Auteur ; Cédric Champollion, Auteur ; Sébastien Argence, Auteur ; Joël Arnault, Auteur ; Christian Barthlott, Auteur ; Andreas Behrendt, Auteur ; Pierre Bosser Année de publication : 2009 Article en page(s) : pp 32 - 42 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Atmosphère
[Termes IGN] convection
[Termes IGN] orographie
[Termes IGN] précipitation
[Termes IGN] troposphèreRésumé : (auteur) L’étude des précipitations convectives induites par l’orographie (Cops selon l’acronyme anglais) est un projet international coordonné qui comprend une campagne d’observations de terrain et un programme scientifique et qui vise à améliorer la qualité des prévisions des précipitations orographiques convectives à la fois par l’observation quadridimensionnelle et la modélisation de leur cycle de vie. La campagne de terrain s’est déroulée en juin-juillet-août 2007 sur l’est de la France et le sud-ouest de l’Allemagne. Son objectif majeur était de fournir un jeu d’observations météorologiques, in situ et à distance, aussi complet que possible et sur toute la profondeur de la colonne troposphérique. Après une brève revue d’ensemble du projet, l’article se concentre sur la contribution française à la campagne Cops, décrit le dispositif expérimental mis en œuvre et met en valeur quelques observations clés. Numéro de notice : A2009-575 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.4267/2042/23632 En ligne : https://doi.org/10.4267/2042/23632 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102374
in La Météorologie > n° 64 [01/01/2009] . - pp 32 - 42[article]
Titre : Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2 Type de document : Article/Communication Auteurs : Sophie Bastin, Auteur ; Cédric Champollion, Auteur ; Olivier Bock Année de publication : 2007 Article en page(s) : pp 167 - 182 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] vapeur d'eauRésumé : (auteur) Global positioning system (GPS) data from a dense network have been used for the analysis of the diurnal cycle of water vapor over Marseille, France, during the second intensive observation period (IOP2; 21–26 June 2001) of the Expérience sur Sites pour Contraindre les Modèles de Pollution Atmosphérique et de Transport d’Emission (ESCOMPTE) field experiment. Both tomographic analyses and integrated water vapor (IWV) contents from GPS have been used, in addition to wind profiler data and surface observations. Tomographic analysis of data from the dense GPS network and radiosondes provided the continuous temporal evolution of the vertical distribution of water vapor over the city of Marseille. The city is located on the shore of the Mediterranean Sea in southeastern France and is often under the influence of sea-breeze effects. Two different layers of breeze circulation are identified: a shallow sea breeze, blowing perpendicular to the local coastline, and a deep sea breeze, induced by the regional temperature gradient between sea and land. The origin of water vapor is shown to be mainly due to the advection of marine moist air by these sea-breeze circulations. However, the diurnal cycle of water vapor over Marseille is strongly influenced by the synoptic situation, which changes during the IOP2 (between a northerly mistral in the early stage of the IOP and an easterly wind at the end). It is shown that vertical profiles from tomographic analyses (combined with wind profiler data) allow for a proper interpretation of the diurnal cycle observed in IWV. Two-dimensional maps of IWV are also shown to complement the description of the horizontal advection of moisture by the different circulation regimes. Numéro de notice : A2007-678 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1175/JAM2450.1 En ligne : https://doi.org/10.1175/JAM2450.1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102779
in Journal of Applied Meteorology and Climatology > vol 46 n° 2 (February 2007) . - pp 167 - 182[article]Quantification de la vapeur d'eau troposphérique par GPS (modèles 2D et tomographies 3D) - Application aux précipitations intenses / Cédric Champollion (2005)
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