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SUMMARY: Could stratospheric aerosol injection produce meaningful global c
 ooling without novel aircraft? -  Alistair Duffey  PhD Student at Universi
 ty College London\, Earth Sciences
DTSTART:20250318T110000Z
DTEND:20250318T120000Z
UID:TALK229210@talks.cam.ac.uk
CONTACT:Dr Megan Brown
DESCRIPTION:Stratospheric aerosol injection (SAI) is a proposed method of 
 cooling the planet and reducing the impacts of climate change by adding a 
 layer of small particles to the high atmosphere where they would reflect a
  fraction of incoming sunlight. While it is likely\n that SAI could reduce
  global temperature\, it has many serious risks and would not perfectly of
 fset climate change. For SAI to be effective\, injection would need to tak
 e place in the stratosphere. The height of the transition to the stratosph
 ere decreases with\n latitude\, from around 17km near the equator to 8km n
 ear the poles. The required injection height would therefore also decrease
  for higher latitude injection. In this talk\, I will present simulations 
 of SAI in an earth system model\, UKESM\, which quantify how\n impacts wou
 ld vary with the injection location and timing\, focusing on low-altitude 
 high-latitude injection strategies. Our results suggest that SAI could mea
 ningfully cool the planet even if limited to using existing large jets and
  injecting at around 13km\n altitude\, if this injection is in the high la
 titudes during spring and summer. However\, relative to a more optimal dep
 loyment with novel aircraft at 20km\, this strategy requires three times m
 ore sulphur dioxide injection and so would strongly increase some\n side-e
 ffects.
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Zoom
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