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SUMMARY:Wilma Huneke (Australian National University)
DTSTART:20210324T090000Z
DTEND:20210324T100000Z
DTSTAMP:20260423T021426Z
UID:BAS-PO/13
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/BAS-PO/13/">
 Spatial and temporal variability of the Antarctic Slope Current in an eddy
 ing ocean-sea ice model</a>\nby Wilma Huneke (Australian National Universi
 ty) as part of BAS Polar Oceans Seminar\n\n\nAbstract\nThe basal melt rate
  of Antarctica's ice shelves is largely controlled by heat delivered from 
 the Southern Ocean to the Antarctic continental shelf. The Antarctic Slope
  Current (ASC) is an almost circumpolar feature that encircles Antarctica 
 along the continental shelf break in an anti-clockwise direction. Because 
 the circulation is to first order oriented along the topographic slope\, i
 t inhibits exchange of water masses between the Southern Ocean and the Ant
 arctic continental shelf and thereby impacts cross-slope heat supply. Dire
 ct observations of the ASC system are sparse\, but indicate a highly varia
 ble flow field both in time and space. Given the importance of the circula
 tion near the shelf break for cross-shelf exchange of heat\, it is timely 
 to further improve our knowledge of the ASC system. This study makes use o
 f the global ocean-sea ice model ACCESS-OM2-01 with a 1/10 degree horizont
 al resolution and describes the spatial and temporal variability of the ve
 locity field. We categorise the modelled ASC into three different regimes\
 , similar to previous works for the associated Antarctic Slope Front: (i) 
 A surface-intensified current found predominantly in East Antarctica\, (ii
 ) a bottom-intensified current found downstream of the dense shelf water f
 ormation sites in the Ross\, Weddell\, and Prydz Bay Seas\, and (iii) a re
 versed current found in West Antarctica where the eastward flowing Antarct
 ic Circumpolar Current impinges onto the continental shelf break. We show 
 that the regional distribution of the ASC regimes aligns well with that of
  the frontal structures. Looking at the temporal variability\, we find dif
 ferences in the seasonal characteristics for each regime. The surface-inte
 nsified ASC exhibits the largest seasonal variability with larger velociti
 es in the autumn and winter months as a response to the variability in the
  wind field. As a final addendum\, note that both spatial and temporal var
 iability is extensive within each ASC regime.\n
LOCATION:https://researchseminars.org/talk/BAS-PO/13/
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