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SUMMARY:Extreme temperatures in the Antarctic - Professor John Turner\, Br
 itish Antarctic Survey
DTSTART:20201112T140000Z
DTEND:20201112T150000Z
UID:TALK153856@talks.cam.ac.uk
CONTACT:Dr Hua Lu
DESCRIPTION:Antarctica is the coldest continent on Earth\, with temperatur
 es above freezing rarely occurring beyond the Antarctic Peninsula and some
  limited regions along the coast of East Antarctica. However\, extreme hig
 h temperatures in these areas can have a significant impact on the ice she
 lves\, 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 th
 eir variability and change over recent decades. We have examined temperatu
 res from 17 stations on the Antarctic continent and nearby sub-Antarctic i
 slands\, investigating the variability and trends in the number of extreme
  temperatures\, which we took as daily mean temperatures beyond the 5th an
 d 95th percentiles. The majority of record high temperatures were recorded
  after the passage of airmasses over high orography\, with the air being w
 armed by the Föhn effect. Counterintuitively\, at some stations in coasta
 l East Antarctica the highest temperatures were recorded after air with a 
 high potential temperature descended from the Antarctic plateau\, resultin
 g in an airmass 5-7°C warmer than the maritime air. The five Antarctic Pe
 ninsula 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.
LOCATION:https://ukri.zoom.us/j/92298256917?pwd=RnFsQmhvNnNjZkpKeXY1V0hYZl
 Jidz09 
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