The bedrock topography of Starbuck Glacier, Antarctic Peninsula, as determined by radio-echo soundings and flow modeling
Abstract
A glacier-wide ice-thickness distribution and bedrock topography is presented for Starbuck Glacier, Antarctic Peninsula. The results are based on 90 km of ground-based radio-echo sounding lines collected during the 2012/13 field season. Cross-validation with ice-thickness measurements provided by NASA's IceBridge project reveals excellent agreement. Glacier-wide estimates are derived using a model that calculates distributed ice thickness, calibrated with the radio-echo soundings. Additional constraints are obtained from in situ ice flow-speed measurements and the surface topography. The results indicate a reverse-sloped bed extending from a riegel occurring ~ 5 km upstream of the current grounding line. The deepest parts of the glacier are as much as 500 m below sea level. The calculated total volume of 80.7 ± 7.2 km3 corresponds to an average ice thickness of 312 ± 30 m. Show more
Publication status
publishedExternal links
Journal / series
Annals of GlaciologyVolume
Pages / Article No.
Publisher
International Glaciological SocietySubject
Antarctic glaciology; Glaciological instruments and methods; Ground-penetrating radar; Ice-shelf tributary glaciers; Radio-echo soundingOrganisational unit
08726 - Funk, Martin (Tit.-Prof.)
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