Ice velocity changes from 1953-2014, Penny Ice Cap, Baffin Island, Nunavut
2017 (English)In: / [ed] International Glaciological Society, 2017Conference paper, Poster (Refereed)
The velocity response of glaciers to increased surface melt has important implications for sea-level rise prediction and this is a major unresolved research topic in glaciology. In this study we investigate velocity changes for the largest ice cap in the southern –-60 years. We use optical and radar satellite imagery and in situ measurements to produce a multi-decadal record of ice velocity changes on Penny Ice Cap, Baffin Island, Canada. The six largest outlet glaciers decelerated at an average rate of 21 m a–1, or 12% per decade over the period 1985–2010. Within this period, most glaciers accelerated until the 1990s, then decelerated. On Highway Glacier, southern Penny Ice Cap, historical measurements are compared to recent imagery and show that this outlet glacier decelerated by 71% between 1953 and 2009/11, from 57 m a–1 to 17 m a–1. The measured slowdown of outlet glaciers are greater than seasonal and interannual fluctuations. This decelerations are concurrent with increases in mass loss, terminus retreat and a reduction in basal sliding, supporting the hypothesis that glacier thinning and/or increases in meltwater production encourage a long-term reduction in ice motion.
Place, publisher, year, edition, pages
Baffin Island, Canada, Arctic, glaciers, velocity
Research subject Earth Science with specialization in Physical Geography
IdentifiersURN: urn:nbn:se:uu:diva-317571OAI: oai:DiVA.org:uu-317571DiVA: diva2:1082339
International Symposium on The Cryosphere in a Changing Climate Wellington, New Zealand, 12–17 February 2017