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What have we learnt from Icesat on Greenland ice sheet change and what to expect from Icesat 2 / Blaženka Bukač in Geodetski vestnik, vol 65 n° 1 (March - May 2021)  

Public [article]  inGeodetski vestnik > vol 65 n° 1 (March - May 2021) . - pp 94 - 109 Titre : What have we learnt from Icesat on Greenland ice sheet change and what to expect from Icesat 2 Type de document : Article/Communication Auteurs : Blaženka Bukač, Auteur ; Marijan Grgić, Auteur ; Tomislav Basic, Auteur Année de publication : 2021 Article en page(s) : pp 94 - 109 Note générale : bibliographie Langues : Anglais (eng) Slovène (slv) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altimétrie satellitaire par laser [Termes IGN] bilan de masse [Termes IGN] calotte glaciaire [Termes IGN] champ de pesanteur terrestre [Termes IGN] données GRACE [Termes IGN] données ICEsat [Termes IGN] glace de mer [Termes IGN] glacier [Termes IGN] Groenland [Termes IGN] levé gravimétrique Résumé : (auteur) Ice-sheet mass balance and ice behaviour have been effectively monitored remotely by space-borne laser ranging technology, i.e. satellite laser altimetry, and/or satellite gravimetry. ICESat mission launched in 2003 has pioneered laser altimetry providing a large amount of elevation data related to ice sheet change with high spatial and temporal resolution. ICESat-2, the successor to the ICESat mission, was launched in 2018, continuing the legacy of its predecessor. This paper presents an overview of the satellite laser altimetry and a review of Greenland ice sheet change estimated from ICESat data and compared against estimates derived from satellite gravimetry, i.e. changes of the Earth’s gravity field obtained from the GRACE data.I n addition to that, it provides an insight into the characteristics and possibilities of ice sheet monitoring with renewed mission ICESat-2, which was compared against ICESat for the examination of ice height changes on the Jakobshavn glacier. ICESat comparison (2004–2008) shows that an average elevation change in different areas on Greenland varies up to ±0.60 m yr−1. Island’s coastal southern regions are most affected by ice loss, while inland areas record near-balance state. In the same period, gravity anomaly measurements showed negative annual mass balance trends in coastal regions ranging from a few cm up to-0.36 m yr-1 w.e.(water equivalent), while inlandrecords show slightly positive trends. According to GRACE observations, in the following years (2009–2017), negative annual mass balance trends on the coast continued. Numéro de notice : A2021-313 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.15292/geodetski-vestnik.2021.01.94-109 Date de publication en ligne : 15/01/2021 En ligne : https://doi.org/10.15292/geodetski-vestnik.2021.01.94-109 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97516 [article]

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