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SUMMARY:West Antarctic Ice Sheet readvance in the Holocene - Dr. Jonathan 
 Kingslake\, Lamont-Doherty Earth Observatory (LDEO)\, Columbia Climate Sch
 ool
DTSTART:20250306T170000Z
DTEND:20250306T180000Z
UID:TALK227947@talks.cam.ac.uk
CONTACT:86998
DESCRIPTION:Sea-level rise is accelerating\, predominantly due to the ice 
 sheets shrinking. There is significant uncertainty as to how this will con
 tinue. Understanding how ice sheets have changed in the past can improve o
 ur predictions of future change by highlighting important processes and he
 lping to test and tune ice-sheet models. This talk is about how West Antar
 ctica changed during the Holocene. Until recently\, it was assumed that th
 e West Antarctic Ice Sheet shrank monotonically from an expanded state at 
 the Last Glacial Maximum (LGM)\, to its current state\, which it then main
 tained through most of the Holocene. In this talk I will describe a decade
  of work by myself and many others suggesting that after the LGM the ice s
 heet instead shrank to a size significantly smaller than today\, then regr
 ew to its current size in the Weddell and Ross sea sectors. In places\, th
 e grounding line may have reached more than 200 km inland of its current p
 osition.\n \nThe cause of the retreat and readvance is debated. Potential 
 causes include glacial isostatic adjustment (GIA) and climate fluctuations
 . Which proves the best explanation has implications for our understanding
  of these sectors’ sensitivity to future climate-driven changes.\n \nI w
 ill discuss a wide range of evidence for retreat and readvance. This inclu
 des englacial structure mapped with ice-penetrating radar\, englacial temp
 eratures measured in boreholes\, radiocarbon in subglacial water and sedim
 ents\, and indicators of relative sea-level change. I will also discuss wh
 at these observations tell us about the timing of retreat and readvance an
 d several modelling studies aimed at determining the cause of these change
 s. Finally\, I will discuss future work that could improve our understandi
 ng of these sectors of the ice sheet and their climate sensitivity.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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