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Estimating geoid height change in North America: past, present and future / T. Jacob in Journal of geodesy, vol 86 n° 5 (May 2012)  

Public [article]  inJournal of geodesy > vol 86 n° 5 (May 2012) . - pp 337 - 358 Titre : Estimating geoid height change in North America: past, present and future Type de document : Article/Communication Auteurs : T. Jacob, Auteur ; John Wahr, Auteur ; R. Gross, Auteur ; S. Swenson, Auteur ; A. Geruo, Auteur Année de publication : 2012 Article en page(s) : pp 337 - 358 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Amérique du nord [Termes IGN] champ de pesanteur local [Termes IGN] données GRACE [Termes IGN] éruption volcanique [Termes IGN] Etats-Unis [Termes IGN] géoïde gravimétrique [Termes IGN] géoïde local [Termes IGN] surveillance géologique Résumé : (Auteur) The forthcoming GRAV-D gravimetric geoid model over the United States is to be updated regularly to account for changes in geoid height. Its baseline precision is to be at the 10–20 mm level over non-mountainous regions. The aim of this study is to provide an estimate of the magnitude, time scale, and spatial footprint of geoid height change over North America, from mass redistribution processes of hydrologic, cryospheric and solid Earth nature. Geoid height changes from continental water storage changes over the past 50 years and predicted over the next century are evaluated and are highly dependent on the used model. Groundwater depletion from anthropogenic pumping in regional scale aquifers may lead to geoid changes of 10 mm magnitude every 50–100 years. The GRACE time varying gravity fields are used to (I) assess the errors in a glacial isostatic adjustment model, which, if used to correct the GRAV-D model, may induce errors at the 10 mm geoid height level after ~20 years, (II), evaluate geoid height change over ice mass loss regions of North America, which, if they remain unchanged in the future, may lead to geoid height changes at the 10 mm level in under a decade and (III), compute sea level rise and its effect on the geoid, which is found to be negligible. Coseismic gravitational changes from past North American earthquakes are evaluated, and lead to geoid change at the 10-mm level for only the largest thrust earthquakes. Finally, geoid change from volcanic processes are assessed and found to be significant with respect to the GRAV-D geoid model baseline precision for cataclysmic events, such as that of the 1980 Mt. St. Helens eruption. Recommendations on how to best monitor geoid change in the future are given. Numéro de notice : A2012-242 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0522-7 Date de publication en ligne : 01/11/2011 En ligne : https://doi.org/10.1007/s00190-011-0522-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31688 [article]

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