Ocean circulation beneath Larsen C Ice Shelf, Antarctica from in situ observations

Hot-water drilled access holes were used to obtain oceanographic data from beneath two sites on Larsen C Ice Shelf, one in the north and one in the south. At both sites the entire water column was colder than the surface freezing point, and the temperature-salinity characteristics are consistent with a High Salinity Shelf Water source of maximum salinity 34.65 psu. At the southern site the 0.08°C thermal driving at the ice base and the 0.2-m s−1 rms water speed resulted in a melt rate of 1.3 ± 0.2 m a−1, as measured over an eight-day period. When combined with the available ship-based data, the evidence suggests that the sub-ice cavity is flushed only by water at the surface freezing point. This implies that the reported decrease in surface elevation of Larsen C Ice Shelf is unlikely to be a result of thinning due to an increasing rate of basal melting.

Details

Publication status:
Published
Author(s):
Authors: Nicholls, Keith W., Makinson, Keith, Venables, Emily

On this site: Emily Venables, Mark Barham, Keith Makinson, Keith Nicholls
Date:
1 January, 2012
Journal/Source:
Geophysical Research Letters / 39
Page(s):
6pp
Digital Object Identifier (DOI):
https://doi.org/10.1029/2012GL053187