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SUMMARY:A regime-based perspective on variability of the Southern Hemisphe
 re mid-latitude jet - Nicholas Byrne\, University of Reading
DTSTART:20171031T140000Z
DTEND:20171031T150000Z
UID:TALK93439@talks.cam.ac.uk
CONTACT:Dr Gillian Young
DESCRIPTION:Variability of the large-scale mid-latitude Southern Hemispher
 e circulation is dominated by apparently random wanderings of the mid-lati
 tude jet. These wanderings of the jet have an important influence on a var
 iety of components of the Southern Hemisphere climate system\, including t
 he location of synoptic storms and Antarctic sea-ice extent. For example\,
  the unprecedented retreat of Antarctic sea-ice that occurred during the s
 pring of 2016 has been linked to unusual behaviour of the jet and increase
 d synoptic storm activity. \n\nIn this talk several lines of evidence will
  be presented to argue that variations of the Southern Hemisphere mid-lati
 tude jet are more systematic than previously thought. In particular\, it w
 ill be argued that jet variability during austral spring and summer is clo
 sely coupled to the seasonal cycle of the polar vortex in the stratosphere
 . Based on this connection with the seasonal cycle of the stratospheric ci
 rculation\, an alternative perspective of tropospheric jet variability wil
 l be proposed. This alternative perspective will subsequently be used to r
 e-interpret several previous results in the literature\, and also to motiv
 ate a partial explanation for the unprecedented Antarctic sea-ice behaviou
 r during spring 2016.
LOCATION:British Antarctic Survey\, Room 187
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