0000000000376131
AUTHOR
Jean Michel Friedt
10 years of monitoring in the Austre Lovén glacier basin (Svalbard): results, and perspectives
International audience
Quantification of sediment transport into Kongsfjorden due to the glacier melt dynamics of Austre Lovenbreen using terrestrial laser scanning
International audience; Climate warming causes a decrease of glaciers in Svalbard. This results in sig-nificant changes of the geomorphology of areas in glacier catchments where iceand permafrost is melting. In particular the snout of the glacier melts drasticallyand the water outflow of the glacier changes sometimes its direction. Sedimentand bed load transport forms new river beds in the moraine, and the sedimentsinvolved are transported downstream into the fjords. In recent years terrestriallaser scanning technology has developed significantly, so it is possible to mea-sure the surface of a whole glacier catchment such as the Austre Lovenbreen inhigh resolution just in a few days or even…
10 years of mass balance over a small Arctic basin. The example of Austre Lovénbreen (Svalbard)
International audience
Fluctuations climatiques récentes en Arctique: l'exemple au Spitsberg occidental
International audience; L' Arctique est indiscutablement reconnu comme la région du globe la plus affec-tée par le réchauffement climatique récent (IPCC, 2013). Si l’impact de ce changement est visible dans les différents systèmes et écosystèmes de l’Arctique (Hagen et al., 2003 ; Kholer et al., 2007) , les rétroactions sur le climat des hautes latitudes de l’hémisphère nord néces-sitent d’être prises en compte pour comprendre plus globalement le climat mondial. Même si des différences existent entre les projections issues des différents modèles climatiques, ces dernières s’accordent toutes sur une augmentation de la température de l’air et des hauteurs de précipitations dans l’Arctique (IP…
High-overtone bulk acoustic resonator as passive ground penetrating RADAR cooperative targets
International audience; RAdio-frequency Detection And Ranging instruments—RADARs—are widely used for applications aimed at measuring passive target velocity or ranging for various metrology applications such as ground position and localization. Within the context of using piezoelectric acoustic passive sensors as cooperative targets to RADARs probed through a radiofrequency link, this paper reports on investigating the compatibility of narrowband resonator architectures with the classical operation mode of wideband RADAR instruments. Since single mode resonators are hardly compatible due to the limited bandwidth of their spectrum, the investigation has been extended to High-overtone Bulk Ac…
L'Arctique en mutation
International audience; AVANT-PROPOS..........................................Daniel JOLYCHAPITRE 1 - Fluctuations climatiques récentes en Arctique : l’exemple du Spitsberg occidental, Madeleine GRISELIN, Christelle MARLIN et Jean-Michel FRIEDTCHAPITRE II - Évolution contemporaine des glaciers arctiques ; exemple de l’Austre Lovénbreen (79°N), Eric BERNARD et Florian TOLLECHAPITRE III - Géomorphologie des côtes rocheuses arctiques, SAMUEL ETIENNE, Jim HANSOM et Donald L. FORBESCHAPITRE IV - L’Arctique face aux crises géomorphologiques paraglaciaires, Denis MERCIERCHAPITRE V - Distribution multi-scalaire de la végétation en Arctique, Martha RAYNOLDCHAPITRE VI - Distribution de la végétation …
Change in geometry of a high Arctic glacier to 1948 to 2013 (Austre Lovénbreen, Svalbard)
International audience; The change of Austre Lovénbreen, a 4.5 km2 land-based glacier along the west coast of Spitsbergen, is investigated using geodetic methods and mass balance measurements over 1948–2013. For 2008−2013, annual mass balances computed on 36-stake measurements were obtained, in addition to annual mass balances reconstructed from the neighbouring glaciers, Midtre Lovénbreen (1968−2007) and Austre Brøggerbreen (1963−1967). The mean rate of glacier retreat for 1948–2013 is −16.7 ± 0.3 m a−1. Fluctuations in area (1948–2013 mean, −0.027 ± 0.002 km2 a−1) showed a slowing as the glacier recedes within its valley from 1990 to 1995. For 1962–2013, the average volume loss calculated…
Landslide monitoring using multi-temporal terrestrial laser scanning(TLS) and electrical resistivity tomography (ERT) in the high Arctic,Ny-Ålesund
International audience; The acceleration of climate-induced changes in high arctic environments is evident and lead to a wide range ofprocesses (e.g. glacier retreat, landslide activity). Recent studies (Bernard et al. 2014) provide evidence that, thestability of the talus covered slopes is reducing and thus landslides are occurring more frequently on the slopessurrounding the Austre Lovénbreen glacier.The Austre Lovénbreen glacier basin is a relatively small arctic glacier basin located at 79◦N, Ny-Ålesund(Svalbard) and geologically is part of the Kongsvegen Group, which is composed of the Nielsenfjellet, Steenfjelletand the Bogegga Formation. This study focusses on the quantitative and sp…