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SUMMARY:Quantification of Kelvin wave-induced subsurface warming along the
  West Antarctic Peninsula - David Webb\, Climate Change Research Centre (C
 CRC)\, UNSW\, Australia
DTSTART:20170717T130000Z
DTEND:20170717T140000Z
UID:TALK73258@talks.cam.ac.uk
CONTACT:Dr Christian Buckingham
DESCRIPTION:The melting of Antarctic ice sheets is a major potential drivi
 ng force for global sea-level rise. One process responsible for Antarctic 
 ice sheet melt is the intrusion of warm circumpolar deep water (CDW) onto 
 the continental shelf\, triggering basal melt at the ice sheet grounding l
 ine. However\, the mechanisms responsible for driving on-shelf CDW intrusi
 ons are not well understood. Here we examine how sea surface height (SSH) 
 anomalies propagating around the Antarctic coastline as coastal-trapped wa
 ves can drive warm water intrusions through changes in bottom Ekman transp
 ort. A wind perturbation motivated by the recent intensification and polew
 ard shift of the Southern Annular Mode (SAM) during its positive phase is 
 applied over Eastern Antarctica between 20◦ E-120◦ E in two global oce
 an sea-ice models (1/4◦ and 1/10◦) and a single-layer shallow-water mo
 del. The changes in winds generate a drop in coastal SSH that propagates a
 round Antarctica as a barotropic Kelvin wave. The SSH drop is accompanied 
 by a barotropic flow which alters the bottom stress\, generating an onshor
 e transport of warm water wherever thermal gradients are favourable. We es
 timate the resulting anomalous bottom Ekman flow and use temperature gradi
 ents calculated from the Southern Ocean State Estimate (SOSE)\, along with
  the 1/4◦ and 1/10◦ models\, to estimate the resultant anomalous tempe
 rature advection. We find an average anomalous subsurface warming of 0.1-0
 .7◦C in 1 year along the West Antarctic Peninsula.
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 2
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