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

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

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3806601m&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 6, CiteID L06601

Physics

2

Oceanography: General: Arctic And Antarctic Oceanography (9310, 9315), Cryosphere: Ice Shelves, Oceanography: Physical: Surface Waves And Tides (1222), Cryosphere: Mass Balance (1218, 1223), Oceanography: General: Continental Shelf And Slope Processes (3002)

Scientific paper

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°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.

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