Influence of tides on melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica

An isopycnic coordinate ocean circulation model is applied to the ocean cavity beneath Filchner-Ronne Ice Shelf, investigating the role of tides on sub-ice shelf circulation and ice shelf basal mass balance. Including tidal forcing causes a significant intensification in the sub-ice shelf circulation, with an increase in melting (3-fold) and refreezing (6-fold); the net melt rate and seawater flux through the cavity approximately doubles. With tidal forcing, the spatial pattern and magnitude of basal melting and freezing generally match observations. The 0.22 m a(-1) net melt rate is close to satellite-derived estimates and at the lower end of oceanographic values. The Ice Shelf Water outflow mixes with shelf waters, forming a cold (<-1.9 degrees C), dense overflow (0.83 Sv) that spills down the continental slope. These results demonstrate that tidal forcing is fundamental to both ice shelf-ocean interactions and deep-water formation in the southern Weddell Sea. Citation: Makinson, K., P. R. Holland, A. Jenkins, K. W. Nicholls, and D. M. Holland (2011), Influence of tides on melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica, Geophys. Res. Lett., 38, L06601, doi: 10.1029/2010GL046462.

Details

Publication status:
Published
Author(s):
Authors: Makinson, Keith ORCIDORCID record for Keith Makinson, Holland, Paul R. ORCIDORCID record for Paul R. Holland, Jenkins, Adrian ORCIDORCID record for Adrian Jenkins, Nicholls, Keith W. ORCIDORCID record for Keith W. Nicholls, Holland, David M.

On this site: Adrian Jenkins, Keith Makinson, Keith Nicholls, Paul Holland
Date:
1 January, 2011
Journal/Source:
Geophysical Research Letters / 38
Page(s):
6pp
Digital Object Identifier (DOI):
https://doi.org/10.1029/2010GL046462