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The variability of water vapour and pre-convective conditions over the mountainous island of Corsica / Bianca Adler in Quarterly Journal of the Royal Meteorological Society, vol 142 n° S1 (August 2016)
[article]
Titre : The variability of water vapour and pre-convective conditions over the mountainous island of Corsica Type de document : Article/Communication Auteurs : Bianca Adler, Auteur ; Norbert Kalthoff, Auteur ; Martin Kohler, Auteur ; Jan Handwerker, Auteur ; Andreas Wieser, Auteur ; Ulrich Corsmeier, Auteur ; Christoph Kottmeier, Auteur ; Dominique Lambert, Auteur ; Olivier Bock , Auteur Année de publication : 2016 Projets : HyMeX / Richard, Evelyne Article en page(s) : pp 335 - 346 Note générale : biblographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] circulation atmosphérique
[Termes IGN] convection
[Termes IGN] coordonnées GPS
[Termes IGN] Corse
[Termes IGN] couche atmosphérique
[Termes IGN] données météorologiques
[Termes IGN] teneur intégrée en vapeur d'eauRésumé : (auteur) Comprehensive measurements were carried out on the mountainous island of Corsica during the Hydrological cycle in the Mediterranean Experiment (HyMeX) field campaign in 2012. Using data from an operational GPS network, radiosondes and microwave radiometers, we studied the spatio-temporal variability of integrated water vapour (IWV) and convection-related parameters in the pre-convective environment over the island. The following spatial differences in the IWV evolution occurred frequently. In the interior of the island the IWV strongly increased around noon, while on the upstream coast only small variations were observed. We showed that a transport of water vapour with thermally driven circulations and the formation of elevated humidity layers due to advective venting caused the diurnal IWV variation over and downstream of the mountains. Spatial inhomogeneities in the pre-convective atmospheric conditions evolved and the knowledge of these turned out to be crucial to understanding the timing and location of isolated deep convection over the island. Numéro de notice : A2016-937 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/qj.2545 Date de publication en ligne : 04/03/2015 En ligne : http://dx.doi.org/10.1002/qj.2545 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83290
in Quarterly Journal of the Royal Meteorological Society > vol 142 n° S1 (August 2016) . - pp 335 - 346[article]14 years of GPS tropospheric delays in the French–Italian border region : comparisons and first application in a case study / Domenico Sguerso in Applied geomatics, vol 8 n° 1 (March 2016)
[article]
Titre : 14 years of GPS tropospheric delays in the French–Italian border region : comparisons and first application in a case study Type de document : Article/Communication Auteurs : Domenico Sguerso, Auteur ; Laurent Labbouz, Auteur ; Andrea Walpersdorf, Auteur Année de publication : 2016 Article en page(s) : pp 13 - 25 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Alpes
[Termes IGN] coordonnées GNSS
[Termes IGN] données météorologiques
[Termes IGN] France (administrative)
[Termes IGN] GAMIT
[Termes IGN] Italie
[Termes IGN] RENAG
[Termes IGN] réseau géodésique permanent
[Termes IGN] retard troposphérique
[Termes IGN] retard troposphérique zénithal
[Termes IGN] série temporelle
[Termes IGN] teneur intégrée en vapeur d'eau
[Vedettes matières IGN] Traitement de données GNSSRésumé : (Auteur) Global Positioning System (GPS) data from 181 permanent stations extracted from different networks covering France and the Italian part of the Alps are used to estimate a homogeneous set of tropospheric parameters over 14 years (from January 1998 to May 2012). The tropospheric Zenith Total Delay (ZTD) quantified in the GPS data analysis is closely related to the value of integrated water vapor above each GPS station. GPS ZTD is already successfully used for operational weather prediction and meteorological analyses, providing valuable data to improve our comprehension of the tropospheric water cycle and in particular to improve the prediction of precipitations. Moreover, GPS tropospheric measurements are intrinsically stable, so that long-term observations represent a signi``ficant contribution to climatological studies. The results of a homogeneous reanalysis of up to 14 years of data with MIT’s GAMIT/GLOBK software are presented. The estimated tropospheric parameters are one ZTD every 2 h and one couple of horizontal tropospheric gradients, seven times a day for each station, simultaneously with a daily positioning solution. A quality check of the tropospheric parameter time series identifies offsets, for example, due to instrument changes at individual sites. Our analysis strategy using the empirical GMF is validated by a comparison with the new GPT2 model. Moreover, a comparison with the IGS analysis of 1 year is provided for common stations. The resulting verified time series can be used for meteorological and climatological studies. As first examples, we present a convergence test for the ZTD change in time and a regional climatological approach that could permit identifying specific patterns of ZTD variation that are related to severe weather events. The 181 ZTD and gradient time series are made available in the Reseau National GPS permanent (RENAG) database. Numéro de notice : A2016--056 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s12518-015-0158-z En ligne : https://doi.org/10.1007/s12518-015-0158-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84204
in Applied geomatics > vol 8 n° 1 (March 2016) . - pp 13 - 25[article]Multi-GNSS meteorology : real-time retrieving of atmospheric water vapor from BeiDou, Galileo, GLONASS, and GPS observations / Xingxing Li in IEEE Transactions on geoscience and remote sensing, vol 53 n° 12 (December 2015)
[article]
Titre : Multi-GNSS meteorology : real-time retrieving of atmospheric water vapor from BeiDou, Galileo, GLONASS, and GPS observations Type de document : Article/Communication Auteurs : Xingxing Li, Auteur ; Galina Dick, Auteur ; Cuixian Lu, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 6385 - 6393 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] correction troposphérique
[Termes IGN] données BeiDou
[Termes IGN] données Galileo
[Termes IGN] données GLONASS
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] retard troposphérique zénithal
[Termes IGN] teneur intégrée en vapeur d'eau
[Termes IGN] vapeur d'eauRésumé : (auteur) The rapid development of multi-Global Navigation Satellite Systems (GNSSs, e.g., BeiDou, Galileo, GLONASS, and GPS) and the International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) brings great opportunities and challenges for real-time determination of tropospheric zenith total delays (ZTDs) and integrated water vapor (IWV) to improve numerical weather prediction, particularly for nowcasting or severe weather event monitoring. In this paper, we develop a multi-GNSS model to fully exploit the potential of observations from all currently available GNSSs for enhancing real-time ZTD/IWV processing. A prototype multi-GNSS real-time ZTD/IWV monitoring system is also designed and realized at the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences (GFZ) based on the precise point positioning technique. The ZTD and IWV derived from multi-GNSS stations are carefully analyzed and compared with those from collocated Very Long Baseline Interferometry and radiosonde stations. The performance of individual GNSS is assessed, and the significant benefit of multi-GNSS for real-time water vapor retrieval is also evaluated. The statistical results show that accuracy of several millimeters with high reliability is achievable for the multi-GNSS-based real-time ZTD estimates, which corresponds to about 1- to 1.5-mm accuracy for the IWV. The ZTD/IWV with improved accuracy and reliability would be beneficial for atmospheric sounding systems, particularly for time-critical geodetic and meteorological applications. Numéro de notice : A2015-844 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2438395 En ligne : https://doi.org/10.1109/TGRS.2015.2438395 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79188
in IEEE Transactions on geoscience and remote sensing > vol 53 n° 12 (December 2015) . - pp 6385 - 6393[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2015121 SL Revue Centre de documentation Revues en salle Disponible Accuracy assessment of water vapour measurements from in-situ and remote sensing techniques during the DEMEVAP 2011 campaing at OHP / Olivier Bock in Atmospheric measurement techniques, vol 6 n° 10 (October 2013)
[article]
Titre : Accuracy assessment of water vapour measurements from in-situ and remote sensing techniques during the DEMEVAP 2011 campaing at OHP Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Pierre Bosser , Auteur ; Thomas Bourcy, Auteur ; Leslie David, Auteur ; F. Goutail, Auteur ; Christophe Hoareau, Auteur ; Dominique Legain, Auteur ; A. Pazmino, Auteur ; Jacques Pelon, Auteur ; Konstantinos Pipis, Auteur ; Guillaume Poujol, Auteur ; Alain Sarkissian, Auteur ; Christian Thom , Auteur ; Guy Tournois, Auteur ; Diane Tzanos, Auteur Année de publication : 2013 Projets : DEMEVAP / Richard, Evelyne Article en page(s) : pp 2777 - 2802 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] campagne d'expérimentation
[Termes IGN] estimation de précision
[Termes IGN] étalonnage des données
[Termes IGN] lidar Raman
[Termes IGN] positionnement par GNSS
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] teneur intégrée en vapeur d'eauRésumé : (auteur) The Development of Methodologies for Water Vapour Measurement (DEMEVAP) project aims at assessing and improving humidity sounding techniques and establishing a reference system based on the combination of Raman lidars, ground-based sensors and GPS. Such a system may be used for climate monitoring, radiosonde bias detection and correction, satellite measurement calibration/validation, and mm-level geodetic positioning with Global Navigation Satellite Systems. A field experiment was conducted in September–October 2011 at Observatoire de Haute-Provence (OHP). Two Raman lidars (IGN mobile lidar and OHP NDACC lidar), a stellar spectrometer (SOPHIE), a differential absorption spectrometer (SAOZ), a sun photometer (AERONET), 5 GPS receivers and 4 types of radiosondes (Vaisala RS92, MODEM M2K2-DC and M10, and Meteolabor Snow White) participated in the campaign. A total of 26 balloons with multiple radiosondes were flown during 16 clear nights. This paper presents preliminary findings from the analysis of all these data sets. Several classical Raman lidar calibration methods are evaluated which use either Vaisala RS92 measurements, point capacitive humidity measurements, or GPS integrated water vapour (IWV) measurements. A novel method proposed by Bosser et al. (2010) is also tested. It consists in calibrating the lidar measurements during the GPS data processing. The methods achieve a repeatability of 4–5%. Changes in the calibration factor of IGN Raman lidar are evidenced which are attributed to frequent optical re-alignments. When modelling and correcting the changes as a linear function of time, the precision of the calibration factors improves to 2–3%. However, the variations in the calibration factor, and hence the absolute accuracy, between methods and types of reference data remain at the level of 7%. The intercomparison of radiosonde measurements shows good agreement between RS92 and Snow White measurements up to 12 km. An overall dry bias is found in the measurements from both MODEM radiosondes. Investigation of situations with low RH values ( Numéro de notice : A2013-807 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/amt-6-2777-2013 Date de publication en ligne : 25/10/2013 En ligne : http://dx.doi.org/10.5194/amt-6-2777-2013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80082
in Atmospheric measurement techniques > vol 6 n° 10 (October 2013) . - pp 2777 - 2802[article]
Titre : GPS meteorology : with focus on climate applications Type de document : Thèse/HDR Auteurs : Tong Ning, Auteur Editeur : Göteborg [Suède] : Chalmers University of Technology Année de publication : 2012 Importance : 82 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-91-7385-675-1 Note générale : Thesis for the degree of doctor of philosophy, Department of Earth and Space Sciences, Chalmers University of Technology, Gothenburg, Sweden Langues : Anglais (eng) Descripteur : [Termes IGN] données GPS
[Termes IGN] modèle atmosphérique
[Termes IGN] retard troposphérique zénithal
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] teneur intégrée en vapeur d'eauRésumé : (auteur) The vital role of water vapour in the Earth’s climate system requires measurements of the atmospheric Integrated Water Vapour (IWV) with a long-term stability and a high accuracy. This work focuses on using the Global Positioning System (GPS) to provide IWV estimates for climate applications. The advantages of the GPS measurements are that they can be performed independently on the weather and have a high temporal resolution (a few minutes) as well as a continuously improving spatial resolution (a few km for some local networks). The uncertainty of the GPS-derived IWV highly depends on the accuracy of the estimated Zenith Total Delay (ZTD), which is determined by many parameters, i.e. satellite orbit errors, ionospheric delay, signal multipath, antenna related errors (e.g. phase centre variations), and mapping functions. We demonstrated that the uncertainty of the GPS-derived IWV below 1 kg/m2 is achievable. The long-term change of the IWV can be an independent data source to detect climate changes. Using a global GPS IWV data set covering a 15-year-long time period, we found estimated IWV trends in a range from ¡1.65 to +2.32 kg/(m2¢decade) which, however, are comparable to the trend uncertainties varying from 0.21 to 1.52 kg/(m2¢decade). The trend uncertainty is mainly caused by the short-term variations of the IWV which cannot be modelled accurately. The uncertainty is also due to the errors in IWV estimates, which are random and/or elevation-dependent systematic errors. A higher elevation cutoff angle used in the GPS data analysis (a 25± was revealed for the time period investigated and for the region of Fennoscandia) can be an advantage to reduce the impact of such systematic errors. The GPS-derived IWV can also be used for the evaluation of climate models. The IWV derived from the GPS measurements acquired at 99 European sites, each with a maximum time series of 14 years, were compared to the IWV simulated by a regional climate model. Overall, a monthly mean difference of »0.5 kg/m2 (model¡GPS) is obtained where a significant seasonal variation is seen in the difference. The model is too dry in the summer. Study of the diurnal cycle of the IWV using both the GPS data and the model simulation shows a good agreement for the phase while a smaller amplitude is seen in the results from the model. Note de contenu : 1 Introduction
1.1 The role of water vapour in the climate system
1.2 Measurements of the atmospheric water vapour
1.3 Thesis structure
2 Measurement Techniques
2.1 Radiosonde
2.2 Radio techniques .
2.3 Summery of Paper A
3 Uncertainty Analysis of the IWV from GPS
3.1 Statistical analysis
3.2 Theoretical analysis
3.3 Summary of Paper B
4 GPS Meteorology for Climate Applications
4.1 Detection of climate changes using GPS data
4.2 Summary of Paper C
4.3 Evaluation of climate models using GPS data
4.4 Summary of Paper D
5 ConclusionsNuméro de notice : 14899 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Earth and Space Sciences : Chalmers University of Technology, Sweden : 2012 DOI : sans En ligne : https://core.ac.uk/download/pdf/70594409.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76783 Documents numériques
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