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vol 111 n° 2-3 - 30 November 2007 - Remote sensing of cryosphere (Bulletin de Remote sensing of environment) / Marco Tedesco
[n° ou bulletin]
Titre : vol 111 n° 2-3 - 30 November 2007 - Remote sensing of cryosphere Type de document : Périodique Auteurs : Marco Tedesco, Éditeur scientifique Année de publication : 2007 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] altimétrie par radar
[Termes IGN] Antarctique
[Termes IGN] Arctique
[Termes IGN] cryosphère
[Termes IGN] glaciologieNuméro de notice : 110-0721 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Numéro de périodique En ligne : http://www.sciencedirect.com/science/journal/00344257/111/2-3?sdc=2 Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=21559 [n° ou bulletin]Contient
- Using remote sensing data to develop seasonal outlooks for Arctic regional sea-ice minimum extent / S. Drobot in Remote sensing of environment, vol 111 n° 2-3 (30 November 2007)
- Polar Radar for Ice Sheet Measurements (PRISM) / S. Gogineni in Remote sensing of environment, vol 111 n° 2-3 (30 November 2007)
Dual-frequency altimeter signal from Envisat on the Amery ice-shelf / Pascal Lacroix in Remote sensing of environment, vol 109 n° 3 (15 August 2007)
[article]
Titre : Dual-frequency altimeter signal from Envisat on the Amery ice-shelf Type de document : Article/Communication Auteurs : Pascal Lacroix, Auteur ; Benoit Legrésy, Auteur ; et al., Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 285 - 294 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] altimétrie par radar
[Termes IGN] Antarctique
[Termes IGN] bande S
[Termes IGN] calotte glaciaire
[Termes IGN] crevasse
[Termes IGN] écho radar
[Termes IGN] épaisseur de la glace
[Termes IGN] image Envisat-AATSR
[Termes IGN] réflectance de surface
[Termes IGN] réflexion spéculaire
[Termes IGN] traitement du signal
[Termes IGN] variation saisonnièreRésumé : (Auteur) In Antarctica, radar altimeter measurements are sensitive to dielectric and penetration properties of the sensed medium (snow) such that the spacecraft's altitude can be biased. Since 2002, relatively low frequency radar measurements over the Amery Ice Shelf, east Antarctica, have been acquired using the Envisat dual frequency altimeter at S (3.2 GHz) and Ku (13.6 GHz) bands, which penetrate a few meters into the firn. The altimeter signal is however modified in summer by the presence of snowfilled crevasses. Indeed, the specularity of the snow surfaces in summer makes the altimetric signal sensitive mostly to nadir echoes, that increases the ratio between the crevasse signal and the surrounding ice-shelf signal at nadir. Crevasses are distinguished by differences in backscattering behavior compared with the surrounding ice-shelf signal. Crevasses are characterized by a strong backscatter coefficient at Ku band and anomalies in the S band altitude estimation. These two characteristics make snowfilled crevasses detectable by the dual frequency altimeter of Envisat. We first retrieve the geometric properties of the crevasses using a hyperbolic shape function, created by strong crevasse backscatter in the Ku waveform measurements. From this retrieved crevasse signal and further waveform analysis, we assess the properties of the snow surface and its sub-surface. The crevasse, due to its small size compared to the altimeter footprint, is found to be an excellent target to study snow properties of the ice-shelf. The anomalies in the S band altitude measurements over crevasses can then be explained by the presence of a double echo in the S band waveforms. This echo is attributed to a reflection at the base of the snowbridge, where we see evidence of sub-surface echos in the individual altimeter waveforms. Based on this observation, a methodology is developed to estimate the thickness of the snowbridge. We calculate the penetration depths in the summer snow surface of the Amery at Ku band, that is found to be around 6 m. Copyright Elsevier Numéro de notice : A2007-312 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2007.01. En ligne : https://doi.org/10.1016/j.rse.2007.01.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28675
in Remote sensing of environment > vol 109 n° 3 (15 August 2007) . - pp 285 - 294[article]Mesure de la déformation de l'écorce terrestre par géodésie spatiale [diaporama] / Jérome Verdun (2006)
Titre : Mesure de la déformation de l'écorce terrestre par géodésie spatiale [diaporama] Type de document : Article/Communication Auteurs : Jérome Verdun , Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2006 Conférence : Forum GPS 2006 01/02/2006 Champs/Marne, Marne-La-Vallée France Importance : 53 p. Format : 30 x 21 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Alpes
[Termes IGN] Antarctique
[Termes IGN] déformation de la croute terrestre
[Termes IGN] lithosphère
[Termes IGN] marée terrestre
[Termes IGN] positionnement par GPS
[Termes IGN] réseau géodésique permanent
[Termes IGN] surcharge océanique
[Termes IGN] tectonique des plaquesNuméro de notice : 15177 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64389 Documents numériques
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15177_diaporama_mesure_deformation_ecorceterrestre_verdun.pdfAdobe Acrobat PDF
Titre : Status of DORIS Stations in Antarctica for Precise Geodesy Type de document : Article/Communication Auteurs : Martine Amalvict, Auteur ; Pascal Willis , Auteur ; K. Shibuya, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2006 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 130 Conférence : IAG 2005, IAG Symposium IAG conference Dynamic Planet - Monitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools 22/08/2005 26/08/2005 Cairns Australie Proceedings Springer Importance : pp 94 - 102 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Adélie, Terre
[Termes IGN] Antarctique
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] gravimètre absolu
[Termes IGN] interférométrie à très grande base
[Termes IGN] levé gravimétrique
[Termes IGN] vitesse de déplacementRésumé : (auteur) Polar regions and especially Antarctica are nowadays recognised as exerting a major control upon the global Mean Sea Level (MSL) directly linked to climate changes. Monitoring and understanding the geodynamical behaviour of these regions is then of critical importance. The long-term displacement (or velocity) of reference sites helps constraining the ice sheet evolution prediction models. Several geodetic space techniques, such as GPS, observe displacements of such reference sites. In Antarctica, in addition to numerous GPS stations, four DORIS stations are permanently operating: Belgrano, Rothera, Syowa, Terre Adélie. In addition to the permanent DORIS stations, episodic DORIS campaigns took also place at Dome C / Concordia and on Sorsdal and Lambert glaciers. In this paper, we first present general information concerning the stations and the campaigns (exact location, period of measurements, etc). We then discuss the solutions obtained by different analysis centres (when available) for all DORIS stations in the Antarctic region. In particular, we use several ITRFs (from the early ITRF96 to ITRF2000) to see their impact on the derived velocities in Antarctica. An emphasis is given to the investigation and possible explanation of differences observed between each solution. Finally, we compare at these stations, the results of DORIS observations to the solutions from other geodetic techniques (GPS, VLBI) and to the results of repeated absolute gravity measurements (when available). Numéro de notice : C2005-042 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-540-49350-1_17 En ligne : https://doi.org/10.1007/978-3-540-49350-1_17 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102723 Interannual variability of planetary waves in the ozone layers at 65°s / A. Grytsai in International Journal of Remote Sensing IJRS, vol 26 n° 16 (August 2005)
[article]
Titre : Interannual variability of planetary waves in the ozone layers at 65°s Type de document : Article/Communication Auteurs : A. Grytsai, Auteur ; Z. Grytsai, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 3377 - 3387 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Antarctique
[Termes IGN] ozone
[Termes IGN] Total ozone mapping spectrometer
[Termes IGN] variation de densitéRésumé : (Auteur) Planetary wave activity in the ozone layer was analysed using the Total Ozone Mapping Spectrometer (TOMS) satellite total ozone measurements. The area under study is southern latitude 65°S, the closest to the location of the Vernadsky station (65°15'S, 64°W). The time-longitude variations in the total ozone during August-December 1979-2003 are presented. The five-month average distributions of the total ozone along the latitude circle of 65°S show the steady features of quasi-stationary zonal distribution caused by superposition of the total wave numbers. The structure of wave number 1 is dominant. Interannual variations and long-term trends of the total wave number amplitude and longitudinal position of the wave ridge (high ozone) and trough (low ozone) are described. Due to the wave amplitude increase the difference between low and high ozone in the opposite longitudinal sectors reached ca 30% in the early 2000s. During 1979-2003 the wave ridge position was relatively stable with the mean longitude of 152 + 15° E; however, the wave trough position drifted eastward from 55°W to the Greenwich meridian with the mean velocity of the long-term drift of 23.6+7.2° per decade. Deviation of the quasi-stationary wave characteristics relative to the mean tendency took place in 1988 and 2002. Numéro de notice : A2005-347 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500076350 En ligne : https://doi.org/10.1080/01431160500076350 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27483
in International Journal of Remote Sensing IJRS > vol 26 n° 16 (August 2005) . - pp 3377 - 3387[article]Réservation
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