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SUMMARY:Extreme temperatures in the Antarctic - John Turner
DTSTART:20201112T140000Z
DTEND:20201112T150000Z
UID:TALK153886@talks.cam.ac.uk
CONTACT:Alison Ming
DESCRIPTION: Antarctica is the coldest continent on Earth\, with temperatu
 res above freezing rarely occurring beyond the Antarctic Peninsula and som
 e limited regions along the coast of East Antarctica. However\, extreme hi
 gh temperatures in these areas can have a significant impact on the ice sh
 elves\, permafrost\, terrestrial biota and logistical activities. The long
  records of in-situ temperature from the research stations provide a means
  of investigating the mechanisms responsible for record temperatures and t
 heir variability and change over recent decades. We have examined temperat
 ures from 17 stations on the Antarctic continent and nearby sub-Antarctic 
 islands\, investigating the variability and trends in the number of extrem
 e temperatures\, which we took as daily mean temperatures beyond the 5th a
 nd 95th percentiles. The majority of record high temperatures were recorde
 d after the passage of airmasses over high orography\, with the air being 
 warmed by the Föhn effect. Counterintuitively\, at some stations in coast
 al East Antarctica the highest temperatures were recorded after air with a
  high potential temperature descended from the Antarctic plateau\, resulti
 ng in an airmass 5-7°C warmer than the maritime air. The five Antarctic P
 eninsula stations examined had all experienced a statistically significant
  increase (p < 0.01) in the number of extreme high temperatures during the
  late Twentieth Century\, although the number of extremes had decreased in
  subsequent years.\n 
LOCATION:Zoom
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