High density coverage investigation of The Austre LovénBreen (Svalbard) using Ground Penetrating Radar

COM; International audience; A three week field survey over April 2010 allowed for the acquisition of 120 Ground Penetrating Radar (GPR) profiles, adding to a 40 km long walk across an Arctic glacier. The profiles were acquired using a Mal°a equipment with 100 MHz antennas, walking slowly enough to record a 2.224 s trace every 30 cm on the average. Some acquisitions were repeated with 50 MHz or 200 MHz antenna to improve data quality. The GPR was coupled to a GPS system to position traces. Each profile has been manually edited using standard GPR data processing, to pick the reflection arrival time from the ice-bedrock interface. Traveltimes were converted to ice thickness using a velocity o…

Using ground based high resolution photography for seasonal snow and ice dynamics (Austre Lovénbreen, Svalbard, 79°N)

COM; International audience; As is the case in many regions, arctic glaciers are reliable indicators of global climate changes. Within this context, the observed ev olutions are becoming faster and more unpre- dictable. Snow and ice dynamics are directly affected, and following processes becomes challenging: some fast but key events can be missed since they are short but significant. Such observations have been made in the Austre Lovénbreen basin (Spitsbergen, Norway - 79°N) during the Hydro-sensor-FlOWS program. In order to perform long term daily monitoring of the glacier basin behaviour aimed at a local scale understanding of the phenomena driving the glacier evolution, satellite imagery…

Variations en surface et en volume du glacier Loven Est (79°N, Spitsberg) en relation avec les changements climatiques contemporains

Estimation des lames d'eau potentielles à partir du croisement de photos in situ et de données de températures - Glacier Austre Lovén (Spitsberg, 79°N)

COM; National audience

La photo haute définition pour comprendre les dynamiques des versants (Austre Lovénbreen, Svalbard, 79°N)

National audience

Hydro-glaciology research on the Austre Lovenbreen since the 60s to the last IPY

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…

Snow cover monitoring using combined FORMOSAT satellite imaging, oblique view ground-based pictures and snow drills

COM; International audience

Changement climatique récent (1969-2006) en Artique à travers les relevés météorologiques de Ny Alesund (Spitsberg, 79°N)

National audience

Hydrochemical response of a polar glacier facing the recent climate changes (Austrelovenbre, Svalbard, 79°N)

Using a small COTS UAV to quantify moraine dynamics in Arctic environments

International audience; Arctic regions are known to be places where climate shift yields most visible consequences. In this context, glaciers and their environment are highly subject to global warming effects. New dynamics are observed and the behaviour of arctic systems (such as glaciers, moraines, beaches etc) changes at rates visible over yearly observations. According to recent works on climate change impacts on the cryosphere, short/violent events are recently observed and are one characteristic of these changes. As a consequence, an accelerating rate of glacial and pro-glacial activity is observed, especially at the end of each hydrological season (early fall). As an example, many pha…

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 …

La photographie au sol pour quantifier la vidange d'un lac supra-glaciaire : Austre Lovénbreen, 79°N, Svalbard

COM; National audience

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…

2D and 3D variations of an Arctic Glacier to recent climate change since forty years (Austre Lovenbreen, Svalbard, 79°N)

International audience

Remote and in situ sensing to survey a glacier basin : protocole of setting up and first results of an IPY project

International audience

Hydrogeochemical approach to understanding the glacier-permafrost subglacial-system interactions in a glaciated catchment of Western Spitsbergen.

COM; International audience

Hydro(geo)logical and geochemical approach to investigate the impact of active layer groundwater on runoff in the Austrelovenbreen watershed (Western Spitsbergen - 79°N)

International audience

Hydrological and geochemical approach to understand the glacier-permafrost subglacial-system interactions in a glaciated catchment of Western Spitsbergen

COM; International audience; The freshwater fluxes flowing from High Arctic glaciers mainly depend on climatic indicators (T, P) but also on other parameters like the thermal state of glacier, the water routing within and below the glacier, the permafrost distribution and the hydrodynamic characteristics of the moraines and rock structures forming the catchment. Using hydrological and geochemical methods, t he objective of the presentation is to show the relationships existing between the hydrological response of a small glacier of the Brogger peninsula (Austrelovenbre glacier), th e climatic conditions and these other parameters. I n the framework o f the Hydrosensor Flows program (IPEV 30…

Relations entre eaux souterraines, cours d'eau et pergélisol au Spitsberg occidental : exemple du bassin versant du glacier Austre Lovén (79°N, Svalbard)

COM; National audience; Dans la zone arctique et sub - arctique, la dégradation du pergélisol est l'une des conséquences visibles du changement climatique. Elle s'associe à des flux croissants d'eau, de solutés et de sédiments qui peuvent significativement impacter les zones côtières et ainsi les océans. Le réchauffement climatique conduit logiquement à une augmentation de la fonte estivale, concentrée sur quelques mois d e l'année. Les flux générés pendant la période de fonte sont des eaux peu minéralisées, le suivi hydrologique aux exutoires couplé à des investigations hydrogéologiques, effectués dans un bassin versant englacé sur la côte occidentale du Spitsberg (Austre Lovénbre : 10 km …

Fourty years of weather data to understand recent climate Change in the Artic (Svalbard, 79°N)

International audience