Topographic and hydrological controls on Subglacial Lake Ellsworth, West Antarctica
Vaughan, David G.; Rivera, Andrés; Woodward, John; Corr, Hugh F.J.; Wendt, Jens; Zamora, Rodrigo. 2007 Topographic and hydrological controls on Subglacial Lake Ellsworth, West Antarctica. Geophysical Research Letters, 34 (18), L18501. 5, pp. 10.1029/2007GL030769Full text not available from this repository.
Subglacial Lake Ellsworth (SLE) was identified using reconnaissance data collected in the 1970s, here we present more detailed surveys. SLE lies beneath 3.2 km of ice in a subglacial valley in West Antarctica. It has an area of only similar to 18 km(2), is dissimilar to the large tectonically-controlled lakes beneath East Antarctica and is a strong candidate for in situ exploration. Our analysis indicates that the ice above SLE is floating on a fluid whose density is 950-1013 kg m(-3). This could indicate freshwater, but certainly precludes seawater, or high salt, acid, or clathrate content. The water in the lake is unlikely to be produced solely by local melt; it is more likely delivered via subglacial drainage. Our surveys show no identifiable hydrological barrier to outflow, meaning SLE is effectively full; new water entering the lake is likely balanced by outflow, which would drain into another lake that we have also identified.
|Programmes:||BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Glacial Retreat in Antarctica and Deglaciation of the Earth System|
|NORA Subject Terms:||Glaciology
|Date made live:||26 Oct 2011 10:05|
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