Descripteur
Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géographie physique > météorologie > aérologie > aérosol > vapeur d'eau
vapeur d'eau |
Documents disponibles dans cette catégorie (58)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Water vapour intercomparison effort in the frame of the Convective and Orographically‐ induced Precipitation Study / Rohini Bhawar (2009)
Titre : Water vapour intercomparison effort in the frame of the Convective and Orographically‐ induced Precipitation Study Type de document : Article/Communication Auteurs : Rohini Bhawar, Auteur ; Paolo di Girolamo, Auteur ; Donato Summa, Auteur ; Cyrille Flamant, Auteur ; Dietrich Althausen, Auteur ; Andreas Behrendt, Auteur ; Alan Blyth, Auteur ; Olivier Bock , Auteur ; Pierre Bosser , Auteur ; et al., Auteur Editeur : AIP Publishing (American institute of physics) Année de publication : 2009 Collection : AIP conference proceedings Conférence : IRS 2008, International Radiation Symposium 03/08/2008 08/08/2008 Foz do Iguaçu Brésil Proceedings AIP Importance : pp 215 - 218 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] altitude
[Termes IGN] analyse comparative
[Termes IGN] erreur systématique
[Termes IGN] précipitation
[Termes IGN] vapeur d'eauRésumé : (auteur) The main objective of this work is to provide accurate error estimates for the different water vapour profiling sensors based on an intensive inter‐comparison effort. The inter‐comparison, performed in the framework of COPS—Convective and Orographically‐induced Precipitation Study (01 June–31 August 2007), involves airborne and ground‐based water vapour lidar systems, radiosondes with different humidity sensors, GPS and Microwave radiometers (MWR). Simultaneous and co‐located data from different sensors are used to compute relative bias and root‐mean square (RMS) deviations as a function of altitude. Numéro de notice : C2008-034 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1063/1.3116952 Date de publication en ligne : 23/03/2009 En ligne : https://doi.org/10.1063/1.3116952 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102525 West African Monsoon observed with ground-based GPS receivers during African Monsoon Multidisciplinary Analysis (AMMA) / Olivier Bock in Journal of geophysical research : Atmospheres, vol 113 n° D21 (16 November 2008)
[article]
Titre : West African Monsoon observed with ground-based GPS receivers during African Monsoon Multidisciplinary Analysis (AMMA) Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Marie-Noëlle Bouin , Auteur ; Erik Doerflinger, Auteur ; Philippe Collard, Auteur ; Florian Masson, Auteur ; Rémi Meynadier, Auteur ; Samuel Nahmani , Auteur ; et al., Auteur Année de publication : 2008 Projets : AMMA & AMMA-2 / Janicot, Serge Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] circulation atmosphérique
[Termes IGN] données GPS
[Termes IGN] erreur systématique
[Termes IGN] humidité de l'air
[Termes IGN] modèle de simulation
[Termes IGN] mousson
[Termes IGN] phénomène atmosphérique
[Termes IGN] précipitation
[Termes IGN] vapeur d'eau
[Termes IGN] variation saisonnièreRésumé : (auteur) A ground-based GPS network has been established over West Africa in the framework of African Monsoon Multidisciplinary Analysis (AMMA) in tight cooperation between French and African institutes. The experimental setup is described and preliminary highlights are given for different applications using these data. Precipitable water vapor (PWV) estimates from GPS are used for evaluating numerical weather prediction (NWP) models and radiosonde humidity data. Systematic tendency errors in model forecasts are evidenced. Correlated biases in NWP model analyses and radiosonde data are evidenced also, which emphasize the importance of radiosonde humidity data in this region. PWV and precipitation are tightly correlated at seasonal and intraseasonal timescales. Almost no precipitation occurs when PWV is smaller than 30 kg m−2. This limit in PWV also coincides well with the location of the intertropical discontinuity. Five distinct phases in the monsoon season are determined from the GPS PWV, which correspond either to transition or stationary periods of the West African Monsoon system. They may serve as a basis for characterizing interannual variability. Significant oscillations in PWV are observed with 10- to 15-day and 15- to 20-day periods, which suggest a strong impact of atmospheric circulation on moisture and precipitation. The presence of a diurnal cycle oscillation in PWV with marked seasonal evolutions is found. This oscillation involves namely different phasing of moisture fluxes in different layers implying the low-level jet, the return flow, and the African Easterly Jet. The broad range of timescales observed with the GPS systems shows a high potential for investigating many atmospheric processes of the West African Monsoon. Numéro de notice : A2008-656 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2008JD010327 Date de publication en ligne : 05/11/2008 En ligne : https://doi.org/10.1029/2008JD010327 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98266
in Journal of geophysical research : Atmospheres > vol 113 n° D21 (16 November 2008)[article]Assessment of water budgets computed from NWP models and observational datasets during AMMA-EOP / Olivier Bock (2008)
Titre : Assessment of water budgets computed from NWP models and observational datasets during AMMA-EOP Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Rémi Meynadier, Auteur ; Françoise Guichard, Auteur ; Pascal Roucou, Auteur ; Aaron Boone, Auteur ; Jean-Luc Redelsperger, Auteur ; Serge Janicot, Auteur Editeur : American meteorological society AMS Année de publication : 2008 Projets : AMMA & AMMA-2 / Janicot, Serge Conférence : CHTM 2008, 28th Conference on Hurricanes and Tropical Meteorology 27/04/2008 02/05/2008 Orlando Floride - Etats-Unis OA Proceedings Importance : 6 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] mousson
[Termes IGN] précipitation
[Termes IGN] prévision météorologique
[Termes IGN] vapeur d'eauRésumé : (auteur) Understanding the water cycle in the West African Monsoon (WAM) system is a major objective of AMMA. The water cycle is the result of the interplay of various coupled atmospheric ocean continental surface processes. The identification of the mechanisms involved and the scales at which they operate is approached here through the investigation of water budgets terms (precipitable water vapour PWV, water vapour fluxes WVF, precipitation P, and evapo-transpiration ETP). The present study focuses on the intercomparison of datasets that are currently used for the computation of such water budgets are large scale. Numerical Weather Prediction (NWP) models provide their own complete description of the water cycle but with limitations (especially in P and ETP terms). During the AMMA EOP, many additional observations went into the NWP operational analyses which might thus be of unprecedented quality. We describe here the seasonal cycles (monthly-mean and short-term variability) of PWV, WVF, P and ETP obtained from ECMWF operational analyses, as well as NCEP reanalysis 1 and 2, for years 2005 to 2007. Significant differences are seen between the different analyses, with NCEP reanalysis 1 being of much poorer quality (in term of overall bias, seasonal cycle and spatial structure). Water vapour convergence and budget closure from the different NWP datasets are also examined in several boxes over continental West Africa. There also, significant differences are found for the different analyses. The water budget estimates are also assessed comparing some terms with observational datasets (PWV from GPS, radiosondes, and satellites; P from EPSAT-SG and GPCP; ETP from land and ocean surface models). A combined water budget is computed, using NWP estimates for WVF and observation-based datasets for P and ETP. This is used to investigate the origine of the sources of water (e.g., oceanic versus continental), the significance of water recycling and atmospheric advection of water, and the link between the intra-seasonal variability in the water budget terms and the coupled atmospheric ocean continental surface processes. Numéro de notice : C2008-037 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://ams.confex.com/ams/pdfpapers/138101.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103422 Processing of Raman lidar measurements for water vapor mixing ratio retrieval / Pierre Bosser (2008)
Titre : Processing of Raman lidar measurements for water vapor mixing ratio retrieval Type de document : Article/Communication Auteurs : Pierre Bosser , Auteur ; Olivier Bock , Auteur ; Christian Thom , Auteur ; Jacques Pelon, Auteur Editeur : International Coordination Group on Laser Atmospheric Studies Année de publication : 2008 Conférence : ILRC 2008, 24th International Laser Radar Conference 23/06/2008 27/06/2008 Boulder Colorado - Etats-Unis OA Proceedings Importance : pp 1041 - 1044 Note générale : PAS DE DOCUMENT, NI D'URL, NI D'ACTES PAPIER CONSERVE Langues : Anglais (eng) Descripteur : [Termes IGN] lidar Raman
[Termes IGN] vapeur d'eauNuméro de notice : C2008-042 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103436 Water vapour intercomparison effort in the frame of the convective and orographically-induced precipitation study / Rohini Bhawar (2008)
Titre : Water vapour intercomparison effort in the frame of the convective and orographically-induced precipitation study Type de document : Article/Communication Auteurs : Rohini Bhawar, Auteur ; Paolo di Girolamo, Auteur ; Cyrille Flamant, Auteur ; Dietrich Althausen, Auteur ; Andreas Behrendt, Auteur ; Alan Blyth, Auteur ; Olivier Bock , Auteur ; Pierre Bosser , Auteur ; et al., Auteur Editeur : International Coordination Group on Laser Atmospheric Studies Année de publication : 2008 Conférence : ILRC 2008, 24th International Laser Radar Conference 23/06/2008 27/06/2008 Boulder Colorado - Etats-Unis OA Proceedings Importance : pp 1017 - 1020 Note générale : PAS DE DOCUMENT, NI D'URL, NI D'ACTES PAPIER CONSERVE Langues : Anglais (eng) Descripteur : [Termes IGN] lidar Raman
[Termes IGN] vapeur d'eauNuméro de notice : C2008-047 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103437 Comparison of ground-based GPS precipitable water vapour to independent observations and NWP model reanalyses over Africa / Olivier Bock in Quarterly Journal of the Royal Meteorological Society, vol 133 n° 629 (Octobre 2007 part B)PermalinkAssessment of GPS data for meteorological applications over Africa: Study of error sources and analysis of positioning accuracy / Andrea Walpersdorf in Journal of Atmospheric and Solar-Terrestrial Physics, vol 69 n° 12 (August 2007)PermalinkMultiscale analysis of precipitable water vapor over Africa from GPS data and ECMWF analyses / Olivier Bock in Geophysical research letters, vol 34 n° 9 (16 May 2007)PermalinkDiurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2 / Sophie Bastin in Journal of Applied Meteorology and Climatology, vol 46 n° 2 (February 2007)PermalinkMapping carbon and water vapor fluxes in a chaparral ecosystem using vegetation indices derived from AVIRIS / D.A. Fuentes in Remote sensing of environment, vol 103 n° 3 (15 August 2006)PermalinkA new method to determine near surface air temperature from satellite observations / Ranjit Singh in International Journal of Remote Sensing IJRS, vol 27 n°12-13-14 (July 2006)PermalinkAssessment of the potential of MERIS near-infrared water vapour products to correct ASAR interferometric measurements / Z. Li in International Journal of Remote Sensing IJRS, vol 27 n°1-2 (January 2006)PermalinkApplication of an automated cloud-tracking algorithm on satellite imagery for tracking and monitoring small mesoscale convective cloud systems / H. Feidas in International Journal of Remote Sensing IJRS, vol 26 n° 8 (April 2005)PermalinkRegional simulation of ecosystem CO2 and water vapor exchange for agricultural land using NOAA AVHRR and Terra MODIS satellite data: Application to Zealand, Denmark / Rasmus M. Houborg in Remote sensing of environment, vol 93 n° 1 (30/10/2004)PermalinkSatellite constellation with direct radio measurements for atmospheric studies : WATS mission case / G. Alberti in International Journal of Remote Sensing IJRS, vol 25 n° 18 (September 2004)Permalink