Geophysical Exploration in Marie Byrd Land, Antarctica

Bentley, Charles R.; Chang, Feng‐Keng

doi:10.1029/ar016p0001

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Most of the data from the remaining UTIG Support Office for Aerogeophysical Research (UTIG-SOAR) surveys had an along-track spacing of $30 m (Blankenship and others, 2001). In areas where there were no RES data we used measurements from seismic traverses associated with the first International Geophysical Year (Bentley and Ostenso, 1961;Bentley and Chang, 1971). Where neither RES nor seismic data were available, we relied on interpolation strategies described by Lythe and others (2001) for the BEDMAP compilation and on subsequent improvements from the BEDMAP Plus database (Pritchard and others, 2009).…”

Section: Ice Thicknessmentioning

confidence: 99%

Modeling 5 years of subglacial lake activity in the MacAyeal Ice Stream (Antarctica) catchment through assimilation of ICESat laser altimetry

et al. 2011

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Subglacial lakes beneath Antarctica’s fast-moving ice streams are known to undergo ∼1 km3 volume changes on annual timescales. Focusing on the MacAyeal Ice Stream (MacIS) lake system, we create a simple model for the response of subglacial water distribution to lake discharge events through assimilation of lake volume changes estimated from Ice, Cloud and land Elevation Satellite (ICESat) laser altimetry. We construct a steady-state water transport model in which known subglacial lakes are treated as either sinks or sources depending on the ICESat-derived filling or draining rates. The modeled volume change rates of five large subglacial lakes in the downstream portion of MacIS are shown to be consistent with observed filling rates if the dynamics of all upstream lakes are considered. However, the variable filling rate of the northernmost lake suggests the presence of an undetected lake of similar size upstream. Overall, we show that, for this fast-flowing ice stream, most subglacial lakes receive >90% of their water from distant distributed sources throughout the catchment, and we confirm that water is transported from regions of net basal melt to regions of net basal freezing. Our study provides a geophysically based means of validating subglacial water models in Antarctica and is a potential way to parameterize subglacial lake discharge events in large-scale ice-sheet models where adequate data are available.

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Section: Ice Thicknessmentioning

confidence: 99%

Modeling 5 years of subglacial lake activity in the MacAyeal Ice Stream (Antarctica) catchment through assimilation of ICESat laser altimetry

et al. 2011

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“…Prior to 1998, geophysical coverage of MBL consisted of data from only two International Geophysical Year traverses (Bentley and Chang, 1971) constraining the bed topography over ∼150,000 km 2 ( Fig. 2A).…”

Section: Introductionmentioning

confidence: 99%