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SUMMARY:Reconstructing levels of volcanism in the late Pleistocene - Jack 
 Longman (Northumbria University)
DTSTART:20250219T173000Z
DTEND:20250219T190000Z
UID:TALK227356@talks.cam.ac.uk
CONTACT:123217
DESCRIPTION:Volcanism is known to act as a driver of change to the Earth s
 ystem on a range of scales. Degassing of greenhouse gases may act to drive
  global warming\, whilst the weathering of fresh volcanic material may enh
 ance the silicate weathering feedback and aid cooling of Earth’s climate
 . At the same time\, the intensity of volcanism responds to other aspects 
 of the Earth system. For example\, low sea levels and low ice volumes may 
 both act to increase levels of volcanic activity through the release of pr
 essure on magma chambers. These interactions in turn may control the level
  of impact volcanism has as a driver of change. To fully understand the in
 teraction between volcanic activity and climate\, however\, reliable recor
 ds of changing volcanic intensity through time are required. Such records 
 have been\, to date\, either regional or of low resolution.\nHere\, I will
  discuss two approaches to this problem\, firstly through the compilation 
 of volcanic material occurrence in deep sea sediment cores. Secondly\, I w
 ill present the application of inversion of atmospheric carbon dioxide rec
 ords as an approach to reconstructing periods of imbalance and likely volc
 anic activity in the carbon cycle. Both approaches highlight a shift in th
 e late Pleistocene at around 400 ka\, whereby more volcanic activity is re
 constructed\, and the activity becomes cyclical in nature. This may be lin
 ked to Mid Brunhes Transition\, a period of strengthening in amplitude of 
 glacial-interglacial cycles\, and indicates how Earth system changes may i
 mpact volcanic intensity.
LOCATION:Latimer Room\, Clare College
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