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SUMMARY:Why has the Antarctic Peninsula stopped warming? - John Turner (Br
 itish Antarctic Survey)
DTSTART:20160112T140000Z
DTEND:20160112T150000Z
UID:TALK63273@talks.cam.ac.uk
CONTACT:James Pope
DESCRIPTION:Over the second half of the Twentieth Century the stations on 
 the Antarctic Peninsula experienced some of the largest increases in surfa
 ce air temperature seen in the Southern Hemisphere. However\, the observat
 ions from six stations with long records show that since the late 1990s th
 e warming has ceased or switched to a significant cooling. I will discuss 
 the factors that influence surface temperatures across the Peninsula\, and
  then focus on the differences in atmospheric and oceanic conditions betwe
 en the warming and cooling periods. From 1979 to the late 1990s the Southe
 rn Annular Mode (SAM) became more positive\, with strengthening westerly w
 inds over the Southern Ocean\, a deepening Amundsen Sea Low and decreasing
  sea ice around the Peninsula. However\, over the last 16 the SAM had expe
 rienced no overall trend\, while the higher frequency of La Nina-like lowe
 r sea surface temperatures across the tropical Pacific has contributed to 
 a strengthening of the Polar Front Jet\, giving more cyclonic activity in 
 the Drake Passage and a higher frequency of easterly winds over the northe
 rn Weddell Sea that has increased the amount of sea ice around the norther
 n part of the Peninsula. I will discuss how the recent temperature trends 
 relate to the palaeoclimate records from the Peninsula and consider the de
 gree to which we can predict the climate of the Peninsula over the coming 
 decades. 
LOCATION:room 307\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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