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Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géographie physique > météorologie > humidité de l'air
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Les leçons de l'expérience AMMA en matière de prévision numérique du temps / Fatima Karbou in La Météorologie, n° spéc (octobre 2012)
[article]
Titre : Les leçons de l'expérience AMMA en matière de prévision numérique du temps Type de document : Article/Communication Auteurs : Fatima Karbou, Auteur ; Florent Beucher, Auteur ; Olivier Bock , Auteur ; Jean-Philippe Lafore, Auteur ; Ziloré Mumba, Auteur ; Jean-Blaise Ngamini, Auteur ; Mathieu Nuret, Auteur ; Florence Rabier, Auteur ; Jean-Luc Redelsperger, Auteur Année de publication : 2012 Projets : AMMA & AMMA-2 / Janicot, Serge Article en page(s) : pp 49 - 54 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique tropicale
[Termes IGN] assimilation des données
[Termes IGN] convection
[Termes IGN] humidité de l'air
[Termes IGN] mousson
[Termes IGN] précipitation
[Termes IGN] prévision météorologique
[Termes IGN] radiosondage
[Termes IGN] télédétection
[Termes IGN] température de l'air
[Termes IGN] troposphère
[Termes IGN] zone intertropicaleRésumé : (auteur) Peut-on prévoir avec précision la mousson de l’Afrique de l’Ouest et notamment son démarrage, sa durée et son intensité ? S’il reste encore du chemin à parcourir avant de réaliser de telles prévisions, des études récentes menées dans le cadre de l’expérience AMMA (Analyses multidisciplinaires de la mousson africaine) ont permis de faire progresser considérablement la prévision numérique du temps dans cette région. Numéro de notice : A2012-063 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article DOI : 10.4267/2042/48132 En ligne : https://doi.org/10.4267/2042/48132 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102762
in La Météorologie > n° spéc (octobre 2012) . - pp 49 - 54[article]Near real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data / Jaroslaw Bosy in Annales Geophysicae, vol 30 n° 9 (September 2012)
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Titre : Near real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data Type de document : Article/Communication Auteurs : Jaroslaw Bosy, Auteur ; J. Kaplon, Auteur ; Witold Rohm, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : 13 p. ; pp 1379 - 1391 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données météorologiques
[Termes IGN] EUPOS
[Termes IGN] modèle atmosphérique
[Termes IGN] Pologne
[Termes IGN] propagation troposphérique
[Termes IGN] surveillance météorologique
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] tomographieRésumé : (Auteur) The near real-time (NRT) high resolution water vapour distribution models can be constructed based on GNSS observations delivered from Ground Base Augmentation Systems (GBAS) and ground meteorological data. Since 2008 in the territory of Poland, a GBAS system called ASGEUPOS (Active Geodetic Network) has been operating. This paper addresses the problems concerning construction of the NRT model of water vapour distribution in the troposphere near Poland. The first section presents all available GNSS and ground meteorological stations in the area of Poland and neighbouring countries. In this section, data feeding scheme is discussed, together with timeline and time resolution. The high consistency between measured and interpolated temperature value is shown, whereas some discrepancy in the pressure is observed. In the second section, the NRT GNSS data processing strategy of ASG-EUPOS network is discussed. Preliminary results show fine alignment of the obtained Zenith Troposphere Delays (ZTDs) with reference data from European Permanent Network (EPN) processing center. The validation of NRT troposphere products against daily solution shows 15mm standard deviation of obtained ZTD differences. The last section presents the first results of 2-D water vapour distribution above the GNSS network and application of the tomographic model to 3-D distribution of water vapour in the atmosphere. The GNSS tomography model, working on the simulated data from numerical forecast model, shows high consistency with the reference data (by means of standard deviation 4mmkm1 or 4 ppm), however, noise analysis shows high solution sensitivity to errors in observations. The discrepancy for real data preliminary solution (measured as a mean standard deviation) between reference NWP data and tomography data was on the level of 9mmkm1 (or 9 ppm) in terms of wet refractivity. Numéro de notice : A2012-749 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5194/angeo-30-1379-2012 Date de publication en ligne : 27/09/2012 En ligne : https://doi.org/10.5194/angeo-30-1379-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33601
in Annales Geophysicae > vol 30 n° 9 (September 2012) . - 13 p. ; pp 1379 - 1391[article]Determining irrigated areas and quantifying blue water use in europe using remote sensing Meteosat Second Generation (MSG) products and Global Land Data Assimilation System (GLDAS) data / Mireia Romaguera in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 8 (August 2012)
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Titre : Determining irrigated areas and quantifying blue water use in europe using remote sensing Meteosat Second Generation (MSG) products and Global Land Data Assimilation System (GLDAS) data Type de document : Article/Communication Auteurs : Mireia Romaguera, Auteur ; Mireia Romaguera, Auteur ; Maarten S. Krol, Auteur ; Mhd. Suhyb Salama, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 861 - 873 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] cultures irriguées
[Termes IGN] erreur systématique
[Termes IGN] Europe (géographie politique)
[Termes IGN] évapotranspiration
[Termes IGN] image MSGRésumé : (Auteur) In this paper, we propose an innovative method for identifying irrigated areas and quantifying the blue evapotranspiration (ETb), or irrigation water evapotranspired from the field. The method compares actual ET (ETactual), or crop water use, values from the Global Land Data Assimilation System (GLDAS) and remote sensing based ETactual estimates obtained from Meteosat Second Generation (MSG) satellites. Since GLDAS simulations do not account for extra water supply due to irrigation, it is expected that they underestimate ETactual during the cropping season in irrigated areas. However, remote sensing techniques based on the energy balance are able to observe the total ETactual. In order to isolate irrigation effects from other fluctuations that may lead to discrepancies between the different ETactual products, the bias between model simulations and remote sensing observations was estimated using reference targets of rainfed (non-irrigated) croplands on a daily basis in different areas across the study region (Europe). Analysis of the yearly values of ETb (irrigated area and volume obtained for croplands in Europe for 2008) showed that the method identified irrigation when yearly values were higher than 50 mm. The accuracy of the method was assessed by analyzing the spatial representativity of the calculated biases and evaluating the daily ETb values obtained. The irrigated areas were compared with the results provided by Siebert et al.(2007) and Thenkabail et al.(2009b), obtaining a spatial match of 47 and 72 percent, respectively, with overestimation of irrigated area on a country scale. Additional evaluation with the ETb results of Mekonnen and Hoekstra (2011) showed 75 percent of overlap for _50 mm range. Finally, validation with in situ data on irrigation volumes proved the cogency of our method with less than 20 percent difference between derived and measured values. Numéro de notice : A2012-432 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.8.861 En ligne : https://doi.org/10.14358/PERS.78.8.861 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31878
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 8 (August 2012) . - pp 861 - 873[article]Estimating irrigated agricultural water use through Landsat TM and a simplified surface energy balance modeling in the semi-arid environments of Arizona / S. Kaplan in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 8 (August 2012)
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Titre : Estimating irrigated agricultural water use through Landsat TM and a simplified surface energy balance modeling in the semi-arid environments of Arizona Type de document : Article/Communication Auteurs : S. Kaplan, Auteur ; S.W. Myint, Auteur Année de publication : 2012 Article en page(s) : pp 849 - 859 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] cultures irriguées
[Termes IGN] évapotranspiration
[Termes IGN] image Landsat-TM
[Termes IGN] Phoenix
[Termes IGN] ressources en eau
[Termes IGN] variation saisonnière
[Termes IGN] zone semi-arideRésumé : (Auteur) Quantifying evapotranspiration (ET) is a key element for achieving better water management, especially in regions where agriculture is the main water consumer. A hybrid model combining the SEBAL and RESET models (S-RESET) was developed to effectively estimate actual ET (water use) of the agriculture sector around the Phoenix metropolitan area. To examine how irrigated agriculture water consumption varies with climate, the S-RESET model was applied under wet and dry climatic conditions. Results show that the average ET for active agriculture is 9.3 mm/day (_ 3.8mm/day) during the study period. Seasonal water use was 438 mm for 2000 (drought) and 494 mm for 2008 (wet). Based on the seasonal ET, we concluded that farmers in arid region use the same amount of water regardless of climatic conditions, implying that the agriculture sector as a whole may not be sensitive to drought as long as there is sufficient water from irrigation. This finding carries significant implications for the region's water security. Numéro de notice : A2012-431 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.8.849 En ligne : https://doi.org/10.14358/PERS.78.8.849 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31877
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 8 (August 2012) . - pp 849 - 859[article]Phenology-based crop classification algorithm and its implications on agricultural water use assessments in California's central valley / L. Zhong in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 8 (August 2012)
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Titre : Phenology-based crop classification algorithm and its implications on agricultural water use assessments in California's central valley Type de document : Article/Communication Auteurs : L. Zhong, Auteur ; P. Gong, Auteur ; Gregory S. Biging, Auteur Année de publication : 2012 Article en page(s) : pp 799 - 813 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Californie (Etats-Unis)
[Termes IGN] carte agricole
[Termes IGN] classification par arbre de décision
[Termes IGN] cultures
[Termes IGN] Enhanced vegetation index
[Termes IGN] évapotranspiration
[Termes IGN] fusion d'images
[Termes IGN] image Landsat-ETM+
[Termes IGN] image Landsat-TM
[Termes IGN] image Terra-MODIS
[Termes IGN] phénologie
[Termes IGN] segmentation d'imageRésumé : (Auteur) The overarching goal of this study was to map specific crop types in the Central Valley, California and estimate the effect of classification uncertainty on the calculation of crop evapotranspiration (ETc). A phenology-based classification (PBC) approach was developed to identify crop types based on phenological and spectral metrics derived from the time series of Landsat TM/ETM_ imagery. Phenological metrics, calculated by fitting asymmetric double sigmoid functions to temporal profiles of enhanced vegetation index (EVI), were capable of separating crop types with distinct crop calendars. An innovative method was used to compute spectral metrics to represent crops' spectral characteristics at certain phenological stages instead of any specific imaging date. Crop mapping using these metrics showed a stable performance without influences of low-quality data and inter-annual differences in imaging dates. The requirement for ground reference data by the PBC approach was low because classification algorithms were mostly built according to the knowledge on crop calendars and agricultural practices. Techniques including image segmentation, data fusion with MODIS imagery, and decision tree were incorporated to make the approach effective and efficient. Though moderate accuracy (~65.0 percent) was achieved, ETc calculated by the Food and Agriculture Organization (FAO) 56 method showed that the estimate of water use was not likely to be significantly affected by the classification error in PBC. All these advantages imply the strength of the PBC approach in the regular crop mapping of the Central Valley. Numéro de notice : A2012-428 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.8.799 En ligne : https://doi.org/10.14358/PERS.78.8.799 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31874
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 8 (August 2012) . - pp 799 - 813[article]Méthodologie de mesure de la vapeur d'eau atmosphérique : Objectifs et premiers résultats de la campagne DEMEVAP 2011 à l'Observatoire de Haute Provence [diaporama] / Emmanuel Bardiere (08/03/2012)PermalinkStudy of seasonal-scale atmospheric water cycle with ground-based GPS receivers, radiosondes and NWP models over Morocco / Achraf Koulali in Atmospheric Research, vol 104 - 105 (February 2012)PermalinkCalibration of wet tropospheric delays in GPS observation using Raman lidar measurements / Pierre Bosser (2012)PermalinkPermalinkPermalinkMéthodologies en traitement de données GPS pour les sciences de l’environnement / Samuel Nahmani (2012)PermalinkPermalinkThree-dimensional humidity retrieval using a network of compact microwave radiometers to correct for variations in wet tropospheric path delay in spaceborne interferometric SAR imagery / S. Sahoo in IEEE Transactions on geoscience and remote sensing, vol 49 n° 9 (September 2011)PermalinkAnalyse combinée de données GPS et lidar Raman acquises lors de la campagne COPS pour l’amélioration du positionnement vertical par GPS / Martin Blocquaux in XYZ, n° 127 (juin - août 2011)PermalinkAnalyse conjointe lidar Raman-GPS pour l'estimation de la composante verticale en GPS / Pierre Bosser in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)Permalink