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SUMMARY:Spatial and temporal variability of the Antarctic Slope Current in
  an eddying ocean-sea ice model -  Wilma Huneke (Australian National Unive
 rsity)
DTSTART:20210324T090000Z
DTEND:20210324T100000Z
UID:TALK156283@talks.cam.ac.uk
CONTACT:Dr Irena Vankova
DESCRIPTION:The basal melt rate of Antarctica's ice shelves is largely con
 trolled by heat delivered from the Southern Ocean to the Antarctic contine
 ntal shelf. The Antarctic Slope Current (ASC) is an almost circumpolar fea
 ture that encircles Antarctica along the continental shelf break in an ant
 i-clockwise direction. Because the circulation is to first order oriented 
 along the topographic slope\, it inhibits exchange of water masses between
  the Southern Ocean and the Antarctic continental shelf and thereby impact
 s cross-slope heat supply. Direct observations of the ASC system are spars
 e\, but indicate a highly variable flow field both in time and space. Give
 n the importance of the circulation near the shelf break for cross-shelf e
 xchange of heat\, it is timely to further improve our knowledge of the ASC
  system. This study makes use of the global ocean-sea ice model ACCESS-OM2
 -01 with a 1/10 degree horizontal resolution and describes the spatial and
  temporal variability of the velocity field. We categorise the modelled AS
 C into three different regimes\, similar to previous works for the associa
 ted Antarctic Slope Front: (i) A surface-intensified current found predomi
 nantly in East Antarctica\, (ii) a bottom-intensified current found downst
 ream of the dense shelf water formation sites in the Ross\, Weddell\, and 
 Prydz Bay Seas\, and (iii) a reversed current found in West Antarctica whe
 re the eastward flowing Antarctic Circumpolar Current impinges onto the co
 ntinental shelf break. We show that the regional distribution of the ASC r
 egimes aligns well with that of the frontal structures. Looking at the tem
 poral variability\, we find differences in the seasonal characteristics fo
 r each regime. The surface-intensified ASC exhibits the largest seasonal v
 ariability with larger velocities in the autumn and winter months as a res
 ponse to the variability in the wind field. As a final addendum\, note tha
 t both spatial and temporal variability is extensive within each ASC regim
 e.
LOCATION:British Antarctic Survey\, Zoom
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