Publications de l'équipe Géodésie de l'UMR IPGP
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Potential volcanological applications of the DORIS system. A geodetic study of the Socorro Island (Mexico) coordinate time-series / Pierre Briole in Geophysical journal international, vol 178 n° 1 (July 2009)
[article]
Titre : Potential volcanological applications of the DORIS system. A geodetic study of the Socorro Island (Mexico) coordinate time-series Type de document : Article/Communication Auteurs : Pierre Briole, Auteur ; Pascal Willis , Auteur ; Jacques Dubois, Auteur ; Olivier Charade, Auteur Année de publication : 2009 Projets : 3-projet - voir note / Article en page(s) : pp 581 - 590 Note générale : biblographie
This work was supported by the Centre National d’Etudes Spatiales (CNES)Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] île
[Termes IGN] Mexique
[Termes IGN] Pacifique (océan)
[Termes IGN] série temporelleRésumé : (auteur) We analysed DORIS data from Socorro Island (Mexico), providing weekly coordinates in ITRF2000 from 1900 to 2006. Careful analysis of this time-series shows horizontal and vertical movements related to recent activity of the Mt. Evermannn volcano. A deflation of the volcano between 1993 and 1996 (−94 mm yr−1 in the N23°W direction, directly pointing in the direction of the crater summit) is observed. We identify also a clear horizontal discontinuity of 81 mm and a significant change in velocity on 2002 October 3. We use a Mogi formalism to provide constraints from our geodetic results on the successive locations and size of the depletion and inflation sources. Our model is consistent with a deflation source for the period 1993–1996 located beneath Mt. Evermannn at a depth of about 6.2 km below sea level. However, our data constrain only the azimuth and dip angles of the source, which could be located elsewhere along the azimuth of the summit, depth and volume varying linearly with the distance. Numéro de notice : A2009-590 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2009.04087.x Date de publication en ligne : 01/07/2009 En ligne : https://doi.org/10.1111/j.1365-246X.2009.04087.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96195
in Geophysical journal international > vol 178 n° 1 (July 2009) . - pp 581 - 590[article]Water vapour variability induced by urban/rural surface heterogeneities during convective conditions / Cédric Champollion in Quarterly Journal of the Royal Meteorological Society, vol 135 n° 642 (July 2009 Part A)
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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 , Auteur ; Jérôme Tarniewicz , Auteur ; Marie-Noëlle Bouin , Auteur ; R. Vautard, Auteur 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]Rates of sea‐level change over the past century in a geocentric reference frame / Guy Wöppelmann in Geophysical research letters, vol 36 n° 12 (June 2009)
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Titre : Rates of sea‐level change over the past century in a geocentric reference frame Type de document : Article/Communication Auteurs : Guy Wöppelmann , Auteur ; C. Letetrel, Auteur ; Álvaro Santamaría, Auteur ; Marie-Noëlle Bouin , Auteur ; Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; Simon D.P. Williams, Auteur ; Bélen Martín Míguez, Auteur Année de publication : 2009 Projets : 3-projet - voir note / Article en page(s) : 6 p. Note générale : bibliographie
The work was partly funded by Région Poitou‐Charentes, which provided a PhD fellowship for C. Letetrel, and by CNES which provided additional support via its TOSCA program.Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] analyse spatio-temporelle
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données marégraphiques
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] niveau de la merRésumé : (auteur) The results from a carefully implemented GPS analysis, using a strategy adapted to determine accurate vertical station velocities, are presented. The stochastic properties of our globally distributed GPS position time series were inferred, allowing the computation of reliable velocity uncertainties. Most uncertainties were several times smaller than the 1–3 mm/yr global sea level change, and hence the vertical velocities could be applied to correct the long tide gauge records for land motion. The sea level trends obtained in the ITRF2005 reference frame are more consistent than in the ITRF2000 or corrected for Glacial‐Isostatic Adjustment (GIA) model predictions, both on the global and the regional scale, leading to a reconciled global rate of geocentric sea level rise of 1.61 ± 0.19mm/yr over the past century in good agreement with the most recent estimates. Numéro de notice : A2009-587 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2009GL038720 Date de publication en ligne : 24/06/2009 En ligne : https://doi.org/10.1029/2009GL038720 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90911
in Geophysical research letters > vol 36 n° 12 (June 2009) . - 6 p.[article]Documents numériques
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Rates of sea‐level change ... - pdf éditeurAdobe Acrobat PDF On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali / Philippe Drobinski in Journal of geophysical research : Atmospheres, vol 114 n° D9 (2009)
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Titre : On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali Type de document : Article/Communication Auteurs : Philippe Drobinski, Auteur ; Sophie Bastin, Auteur ; Serge Janicot, Auteur ; Olivier Bock , Auteur ; A. Dabas, Auteur ; P. Delville, Auteur ; O. Reitebuch, Auteur ; Benjamin Sultan, Auteur Année de publication : 2009 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] données GPS
[Termes IGN] données météorologiques
[Termes IGN] Mali
[Termes IGN] mousson
[Termes IGN] NigerRésumé : (auteur) This paper investigates the fine‐scale dynamical processes at the origin of the late northward migration of the monsoon flow in summer 2006 in the region of Niger and Mali (onset on 3 July 2006 compared to the climatological onset date, 24 June). Compared to a 28‐year climatology, 2006 NCEP‐2 reanalyses show evidence of an anomalous pattern during 10 days between 25 June and 3 July 2006, characterized by the African Easterly Jet (AEJ) blowing from the northeast along a narrow northeast/southwest band located over the Hoggar and Air mountains associated with an unusually strong northeasterly harmattan in the lee of the mountains. Using data collected during the African Monsoon Multidisciplinary Analysis (AMMA) experiment and mesoscale numerical simulations, this study shows evidence of interaction between the AEJ and the orography supported by the reduced gravity shallow water theory which explains the enhancement of the harmattan downstream of the Hoggar and Air mountains in summer 2006. The enhanced harmattan contributes to move southward the intertropical discontinuity (ITD) defined as the interface between the cool moist southwesterly monsoon flow and the warm dry harmattan. Finally, an interaction between the ITD and African Easterly waves contributes to propagate the ITD southward retreat about 1500 km to the west of the Hoggar and Air mountains. Numéro de notice : A2009-594 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2008JD011159 Date de publication en ligne : 13/05/2009 En ligne : https://doi.org/10.1029/2008JD011159 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96202
in Journal of geophysical research : Atmospheres > vol 114 n° D9 (2009)[article]Mesoscale GPS tomography applied to the 12 June 2002 convective initiation event of IHOP_2002 / Cédric Champollion in Quarterly Journal of the Royal Meteorological Society, vol 135 n° 640 (April 2009 part A)
[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 , Auteur ; Florian Masson, Auteur ; David D. Turner, Auteur ; T. Weckwerth, Auteur Année de publication : 2009 Projets : 3-projet - voir note / Janicot, Serge 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]Radiosonde humidity bias correction over the West African region for the special AMMA reanalysis at ECMWF / Anna Agustí‐Panareda in Quarterly Journal of the Royal Meteorological Society, vol 135 n° 640 (April 2009 part A)PermalinkImpact of the network effect on the origin and scale: case study of Satellite Laser Ranging / Xavier Collilieux (2009)PermalinkPermalinkPermalinkPermalinkPermalinkL'allongement troposphérique / Samuel Nahmani (2008)PermalinkStability of VLBI, SLR, DORIS, and GPS positioning / Martine Feissel-Vernier in Earth, Planets and Space, vol 59 n° 6 (June 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)PermalinkChamp de vitesses de l'ITRF, propriétés cinématiques de la croute terrestre et condition de non rotation globale / Juliette Legrand (2007)Permalink