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Science and user needs for observing global mass transport to understand global change and to benefit society / Roland Pail in Surveys in Geophysics, vol 36 n° 6 (November 2015)
[article]
Titre : Science and user needs for observing global mass transport to understand global change and to benefit society Type de document : Article/Communication Auteurs : Roland Pail, Auteur ; Rory Bingham, Auteur ; Carla Braitenberg, Auteur ; Henryk Dobslaw, Auteur ; Annette Eicker, Auteur ; Andreas Güntner, Auteur ; Martin Horwath, Auteur ; Eric Ivins, Auteur ; Laurent Longuevergne, Auteur ; Isabelle Panet , Auteur ; Bert Wouters, Auteur ; IUGG Expert Panel, Auteur Année de publication : 2015 Article en page(s) : pp 743 - 772 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Atmosphère
[Termes IGN] changement climatique
[Termes IGN] gravimétrie spatialeRésumé : (auteur) Satellite gravimetry is a unique measurement technique for observing mass transport processes in the Earth system on a global scale, providing essential indicators of both subtle and dramatic global change. Although past and current satellite gravity missions have achieved spectacular science results, due to their limited spatial and temporal resolution as well as limited length of the available time series numerous important questions are still unresolved. Therefore, it is important to move from current demonstration capabilities to sustained observation of the Earth’s gravity field. In an international initiative performed under the umbrella of the International Union of Geodesy and Geophysics, consensus on the science and user needs for a future satellite gravity observing system has been derived by an international panel of scientists representing the main fields of application, i.e., continental hydrology, cryosphere, ocean, atmosphere and solid Earth. In this paper the main results and findings of this initiative are summarized. The required target performance in terms of equivalent water height has been identified as 5 cm for monthly fields and 0.5 cm/year for long-term trends at a spatial resolution of 150 km. The benefits to meet the main scientific and societal objectives are investigated, and the added value is demonstrated for selected case studies covering the main fields of application. The resulting consolidated view on the required performance of a future sustained satellite gravity observing system represents a solid basis for the definition of technological and mission requirements, and is a prerequisite for mission design studies of future mission concepts and constellations. Numéro de notice : A2015--060 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10712-015-9348-9 Date de publication en ligne : 27/10/2015 En ligne : http://dx.doi.org/10.1007/s10712-015-9348-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83282
in Surveys in Geophysics > vol 36 n° 6 (November 2015) . - pp 743 - 772[article]Ocean loading effects on the prediction of Antarctic glacial isostatic uplift and gravity rates / K. Simon in Journal of geodesy, vol 84 n° 5 (May 2010)
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Titre : Ocean loading effects on the prediction of Antarctic glacial isostatic uplift and gravity rates Type de document : Article/Communication Auteurs : K. Simon, Auteur ; T. James, Auteur ; Eric Ivins, Auteur Année de publication : 2010 Article en page(s) : pp 305 - 317 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Antarctique
[Termes IGN] champ de pesanteur local
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GRACE
[Termes IGN] isostasie
[Termes IGN] positionnement par GPS
[Termes IGN] surcharge océaniqueRésumé : (Auteur) The effect of regional ocean loading on predicted rates of crustal uplift and gravitational change due to glacial isostatic adjustment (GIA) is determined for Antarctica. The effect is found to be significant for the ICE-3G and ICE-5G loading histories (up to -8 mm/year and -3 mm/year change in uplift rate and -3 cm/year and -1 cm/year equivalent water height change (EWHC) of surface mass, respectively). The effect is smaller (+1 mm/year; +0.25 cm/year) for the IJ05 loading history. The impact of ocean loading on the rate of change of the long-wavelength zonal harmonics of the Earth’s gravitational field is also significantly smaller for IJ05 than ICE-3G. A simple analytical formula is derived that is accurate to about 3% in a root-mean-square sense that relates predicted or observed gravitational change at the surface of the Earth (r = a) to the EWHC. A fundamental difference in the definition of the load histories accounts for the differing sensitivities to ocean loading. IJ05 defines its surface load history relative to the present-day surface load, rather than specifying an absolute loading history, and thus implicitly approximates the temporal and spatial mass exchange between grounded ice and open ocean. In contrast, ICE-3G and ICE-5G specify an absolute load history and explicit regional ocean loading substantially perturbs predicted GIA rates. Conclusions of previous studies that used IJ05 predictions without ocean loading are relatively robust. Numéro de notice : A2010-183 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0368-4 Date de publication en ligne : 12/02/2010 En ligne : https://doi.org/10.1007/s00190-010-0368-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30378
in Journal of geodesy > vol 84 n° 5 (May 2010) . - pp 305 - 317[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010051 SL Revue Centre de documentation Revues en salle Disponible Isostatic stability of the East Antarctic station Dumont d'Urville from long-term geodetic observations and geophysical models / Martine Amalvict in Polar research, vol 28 n° 2 (August 2009)
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Titre : Isostatic stability of the East Antarctic station Dumont d'Urville from long-term geodetic observations and geophysical models Type de document : Article/Communication Auteurs : Martine Amalvict, Auteur ; Pascal Willis , Auteur ; Guy Wöppelmann , Auteur ; Eric Ivins, Auteur ; Marie-Noëlle Bouin , Auteur ; Laurent Testut, Auteur ; Jacques Hinderer, Auteur Année de publication : 2009 Article en page(s) : pp 193 - 202 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Antarctique
[Termes IGN] coordonnées GPS
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données géophysiques
[Termes IGN] rebond post-glaciaireRésumé : (auteur) Geodetic measurements of the vertical crustal displacement collocated with absolute gravity changes provide a discriminatory measurement of present-day glacial changes, versus more deeply seated rock motions caused by glacial isostatic adjustment (GIA). At the East Antarctic station of Dumont d'Urville, we compare the displacements derived from continuous DORIS (1993.0–2006.0) and Global Positioning System (GPS) (1999.0–2005.7) data, and observed changes in absolute gravity (2000–2006), with the predicted vertical displacement and change in gravity from GIA modelling. The geodetic results have mutual self-consistency, suggest station stability and provide upper bounds on both GIA and secular ice mass changes. The GIA models tend to predict amplitudes of rock motion larger than those observed, and we conclude that this part of Antarctica is probably experiencing a slight gain in ice mass, in contrast to West Antarctica. Numéro de notice : A2009-579 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1111/j.1751-8369.2008.00091.x En ligne : http://doi.org/10.1111/j.1751-8369.2008.00091.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88648
in Polar research > vol 28 n° 2 (August 2009) . - pp 193 - 202[article]