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New oceanographic data from beneath Ronne Ice Shelf, Antarctica
Author(s) -
Nicholls K. W.,
Makinson K.,
Johnson M. R.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl03922
Subject(s) - ice shelf , geology , oceanography , iceberg , sea ice , hydrography , mooring , current (fluid) , cryosphere
Oceanographic data have been obtained via an access hole made through Ronne Ice Shelf. The site, which is the third in a series of similar studies, lies 17 km west of Korff Ice Rise where 825 m of ice overlies a 485‐m deep water column. Measurements included conductivity and temperature profiles, and an instrument mooring was deployed for long‐term measurements of currents, temperature and conductivity. At the sea floor there was a 150‐m layer of well‐mixed water with a potential temperature and salinity of −1.97°C and 34.72. The water cooled and freshened towards the ice‐shelf base, ultimately reaching −2.41°C and 34.51. The hydrographic and water current data imply a flow into the deepest part of the sub‐ice shelf cavity of about 200,000 m³ s −1 of the deeper, relatively warm water, which would be able to power an average basal melt rate of 0.2 m a −1 for the western portion of Ronne Ice Shelf.