Title Ice thickness and basal conditions of Vestfonna ice cap, eastern Svalbard
Author Pettersson, R.; Christoffersen, P.; Dowdeswell, J.A.; Pohjola, V.A.; Hubbard, A.; Strozzi, T.
Author Affil Pettersson, R., Uppsala University, Department of Earth Sciences, Uppsala, Sweden. Other: University of Lapland, Finland; Gdynia Maritime University, Poland; Scott Polar Research Institute, United Kingdom; Aberystwyth University, United Kingdom; Gamma Remote Sensing, Switzerland
Source The International Polar Year Project 'KINNVIKA'; Arctic warming and impact research at 80N, prefaced by V.A. Pohjola, P. Kankaanpaa, J.C. Moore and T. Pastusiak. Geografiska Annaler. Series A: Physical Geography, 93(4), p.311-322, . Publisher: Wiley-Blackwell published on behalf of Svenska Saellskapet foer Antropologi och Geografi, Stockholm, Sweden. ISSN: 0435- 3676
Publication Date Dec. 2011
Notes In English. 66 refs. CRREL Acc. No: 66000716
Index Terms echo sounding; glacial geology; ice cover; ice cover thickness; mass balance; radar; temperature; topography; Spitsbergen-- Nordaustlandet; Arctic region; ice caps; International Polar Year 2007-08; IPY 2007-08 Research Publications; Nordaustlandet; radar methods; Spitsbergen; subglacial environment; Svalbard; Vestfonna ice cap
Abstract We combined ground-based pulsed radar data collected in 2008-2009 with airborne radio-echo sounding data acquired in 1983 and 1986 over Vestfonna ice cap, Svalbard. The airborne dataset mainly covers the fast- flowing outlet glaciers and the marginal zone, while the ground-based data explicitly cover the interior part of the ice cap. The data presented here are thus the first complete estimate of bed topography and ice thickness. The subglacial landscape undulates with elevations between -160 and +410 m above sea level. The mean ice thickness is 186 m and the total ice area and volume are 2402 km2 and 4420.6 km3, respectively. This is a much smaller volume than those derived from empirical volume-area scaling relationships currently used to estimate regional-to-global glacier volumes. This difference may depend on local conditions for Vestfonna and emphasizes the need to include more volume observations in the derivations of volume- area scaling parameters. We also derive basal reflectivity as a proxy for thermal conditions at the bed. Basal reflectivity values suggest that fast-flowing outlet glaciers are underlain by temperate conditions. The geometric boundaries and basal conditions for Vestfonna will be critical additions to the development of numerical models of the ice cap and to the estimation of more accurate area-volume scaling parameters. Abstract Copyright (2011), Swedish Society for Anthropology and Geography.
URL http://hdl.handle.net/10.1111/j.1468-0459.2011.00438.x
Publication Type journal article
Record ID 311069