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CATEGORIES:British Antarctic Survey
SUMMARY:The Last Interglacial period: the key to understan
 ding future ice-sheet stability and sea-level chan
 ges under a warm climate - Emma Stone\, University
  of Bristol
DTSTART;TZID=Europe/London:20150521T100000
DTEND;TZID=Europe/London:20150521T110000
UID:TALK59501AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/59501
DESCRIPTION:The Last Interglacial period (LIG\, 129-116 thousa
 nd years ago\, ka) represents a time when sea-leve
 l was at least 6 m higher than today and high lati
 tude summer temperatures were several degrees warm
 er.  For these reasons\, along with reasonable pal
 aeo-data coverage and temporal resolution\, this t
 ime period provides an ideal opportunity with whic
 h to understand and test the climate and ice sheet
  mechanisms that operate under warm climates in or
 der to more robustly inform on future warm climate
 s and their impact on sea-level change.\n\nThe IPC
 C AR5 reported in its Summary for Policy Makers th
 at during the LIG “…the Greenland ice sheet very l
 ikely contributed between 1.4 and 4.3 m to the hig
 her global mean sea level\, implying with medium c
 onfidence an additional contribution from the Anta
 rctic ice sheet”. Here I review this potential red
 uction in ice-volume of the Greenland ice sheet 13
 0-120ka\, derived from modelling and data approach
 es. \n \nModelling the Antarctic component to sea-
 level change is more complex\, however. Up until r
 ecently\, climate model simulations of the LIG wer
 e compared with temperature reconstructions repres
 enting the warmest temperature for the whole time 
 period\, neglecting any temporal variation between
  regions (e.g. Turney & Jones\, 2010).  A new comp
 ilation (Capron et al\, 2014) of high-latitude tem
 perature changes across the LIG shows at 130ka non
 -synchronous maximum summer temperature changes be
 tween the two hemispheres with the Southern Ocean 
 and Antarctica records showing early warming compa
 red with North Atlantic records.  Comparison with 
 model simulations selected as part of an ‘ensemble
  of opportunity’ at the PMIP3 2012 General Meeting
   (Lunt et al. 2013) shows that the models predict
  warmer than present conditions earlier than docum
 ented in the North Atlantic records\, while the re
 constructed early Southern Ocean and Antarctic war
 ming is not captured by any model. Not only does t
 his comparison highlight the importance of produci
 ng defined time slices rather than one representat
 ive climate for the LIG but implies that important
   missing processes in the models are likely requi
 red to account for this temporal mismatch between 
 data and model.\n \nHere I show that by not neglec
 ting the melt of ice sheets from the previous glac
 iation this mismatch between data and model can pa
 rtially be resolved.  This will have implications 
 for modelling the stability of the West Antarctic 
 Ice Sheet as it provides a mechanism by which to w
 arm the Southern Ocean when other forcings were si
 milar to today.\n
LOCATION:British Antarctic Survey\, Room 307
CONTACT:Jonathan Kingslake
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