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SUMMARY:Characteristics\, mechanisms and implications of abrupt glacial cl
 imate changes - Xu Zhang\, Institute of Tibetan Plateau Research\, Chinese
  Academy of Sciences
DTSTART:20220909T093000Z
DTEND:20220909T103000Z
UID:TALK178637@talks.cam.ac.uk
CONTACT:Dr Alex Bradley
DESCRIPTION:During glacial periods of the Late Pleistocene\, an abundance 
 of proxy data demonstrates the existence of large and repeated millennial-
 scale abrupt climate changes\, known as Dansgaard–Oeschger (DO) variabil
 ity as first identified in Greenland ice core records. These events are ch
 aracterized by rapid warming from stadial to interstadial conditions with 
 surface temperature changes of up to 16°\, sometimes occurring within dec
 ades and hence has drawn broad attention within the science and policy-mak
 ing communities alike. In this seminar\, I will update you of the current 
 understanding of the governing dynamics of DO variability\, as well as its
  climatic characteristics. In particular\, I will show that gradual change
 s in Northern hemisphere ice sheets\, atmosphere CO2 and Earth’s orbit c
 an directly simulate DO-like abrupt climate changes\, providing a dynamic 
 framework to understanding the origin of DO variability across time. These
  results further suggest that climate background is of great importance on
  the occurrences of abrupt climate change\,  of which changes however are 
 not well considered in our future projections by climate models. In this c
 ontext\, some suggestions are provided to help improve reliability of our 
 future projections\, avoiding underestimation of potential climate crisis 
 that might occur in near future.
LOCATION:BAS Cambridge Conference Room (and online)
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