Title Glaciological investigations of Union Glacier, Ellsworth Mountains, West Antarctica
Author Rivera, A.; Zamora, R.; Rada, C.; Walton, J.; Proctor, S.
Author Affil Rivera, A., Centro de Estudios Científicos, Valdivia, Chile. Other: Antarctic Logistics and Expeditions; Topcon Europe Positioning, Netherlands
Source Glaciology in the International Polar Year, prefaced by G.H. Gudmundsson. Annals of Glaciology, 51(55), p.91-96, . Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0260- 3055
Publication Date 2010
Notes In English. 26 refs. CRREL Acc. No: 64004761
Index Terms glacial geology; glaciers; ice; ice cover; ice cover thickness; glacier flow; Antarctica--Ellsworth Mountains; Antarctica-- West Antarctica; Antarctica; Ellsworth Land; Ellsworth Mountains; ice movement; International Polar Year 2007-08; IPY 2007-08 Research Publications; numerical models; Union Glacier; West Antarctica
Abstract Union Glacier, West Antarctica, was intensively mapped in December 2008, when an oversnow traverse was conducted by CECS and ALE, with the aim to determine the ice- dynamical characteristics of the glacier, through mapping the crevasse fields and by providing a glaciological baseline for future studies. A mean ice thickness of 1450 m was measured, confirming the presence of a deep subglacial topography (approx. 900 m below sea level), much deeper than previously estimated. Ice velocities were also measured at 21 stakes drilled into the ice at the narrowest gate of the glacier between December 2007 and December 2008, yielding a mean value of 22.6 m a-1. These velocities, combined with the measured ice thicknesses and a numerical model, yielded an ice flux of 0.10±0.03 km3 a-1 w.e. Considering the ice basin above this gate, a mean surface mass balance of 0.18±0.05 m a-1 was estimated, a value consistent with a mean snow accumulation for nearby ice streams. These values indicate that the glacier is at present near equilibrium.
URL http://www.igsoc.org/annals/v51/55/a55a099.pdf
Publication Type journal article
Record ID 300285