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Auteur O. Baur |
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Continental mass change from GRACE over 2002–2011 and its impact on sea level / O. Baur in Journal of geodesy, vol 87 n° 2 (February 2013)
[article]
Titre : Continental mass change from GRACE over 2002–2011 and its impact on sea level Type de document : Article/Communication Auteurs : O. Baur, Auteur ; M. Kuhn, Auteur ; Will E. Featherstone, Auteur Année de publication : 2013 Article en page(s) : pp 117 - 125 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse diachronique
[Termes IGN] continent
[Termes IGN] données GRACE
[Termes IGN] eau de fonte
[Termes IGN] géocentre
[Termes IGN] levé gravimétrique
[Termes IGN] masse de la Terre
[Termes IGN] niveau de la mer
[Termes IGN] niveau moyen des mers
[Termes IGN] variationRésumé : (Auteur) Present-day continental mass variation as observed by space gravimetry reveals secular mass decline and accumulation. Whereas the former contributes to sea-level rise, the latter results in sea-level fall. As such, consideration of mass accumulation (rather than focussing solely on mass loss) is important for reliable overall estimates of sea-level change. Using data from the Gravity Recovery And Climate Experiment satellite mission, we quantify mass-change trends in 19 continental areas that exhibit a dominant signal. The integrated mass change within these regions is representative of the variation over the whole land areas. During the integer 9-year period of May 2002 to April 2011, GIA-adjusted mass gain and mass loss in these areas contributed, on average, to -(0.7 + 0.4) mm/year of sea-level fall and + (1.8 + 0.2) mm/year of sea-level rise; the net effect was + (1.1 + 0.6) mm/year. Ice melting over Greenland, Iceland, Svalbard, the Canadian Arctic archipelago, Antarctica, Alaska and Patagonia was responsible for + (1.4+0.2) mm/year of the total balance. Hence, land-water mass accumulation compensated about 20 % of the impact of ice-melt water influx to the oceans. In order to assess the impact of geocentre motion, we converted geocentre coordinates derived from satellite laser ranging (SLR) to degree-one geopotential coefficients. We found geocentre motion to introduce small biases to mass-change and sea-level change estimates; its overall effect is + (0.1 + 0.1) mm/year. This value, however, should be taken with care owing to questionable reliability of secular trends in SLR-derived geocentre coordinates. Numéro de notice : A2013-098 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0583-2 Date de publication en ligne : 14/07/2012 En ligne : https://doi.org/10.1007/s00190-012-0583-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32236
in Journal of geodesy > vol 87 n° 2 (February 2013) . - pp 117 - 125[article]Exemplaires(1)
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