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SUMMARY:EESS talk on "The physics and chemistry of aerosols for potential 
 injection  into the stratosphere to cool the planet"
DTSTART:20250527T121500
DTEND:20250527T131500
DTSTAMP:20260502T120042Z
UID:4d607ab1f687bcd9ad3dc969528ee622ceea7b6c549fac2ec551f487
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Thomas Peter\, Institute for Atmospheric and Climate Sci
 ence\, ETHZ\nAbstract:\nHow well do we understand the physicochemical prop
 erties of aerosols that are considered for injection into the stratosphere
  to cool the climate? Almost two decades after Paul Crutzen’s propositio
 n for research on increasing the planet’s albedo by injecting sulfur int
 o the stratosphere\, detailed knowledge is still limited about the convers
 ion of sulfur-containing gases (SO2\, H2S) into aqueous sulfuric acid drop
 lets\, let alone about mechanisms of other potential species such as calci
 te\, alumina or diamond under stratospheric conditions.\nWhile the scienti
 fic community’s reaction to Crutzen’s 2006 proposal to research such e
 nvironmental engineering measures ranged from skepticism to outright rejec
 tion\, even in the mid-2020s there is little hope that global greenhouse g
 as emissions can be reduced fast enough to meet the goals set by the 2015 
 Paris Agreement. Aside from global governance\, legal and ethical issues t
 hat need to be adequately addressed before any deployment of stratospheric
  aerosol injections can be considered\, we must be prepared to compare the
  risks and uncertainties of an injection scheme with those of not using it
  as long as greenhouse gas emissions continue unabated and efficient techn
 iques for negative emissions are not yet within reach. To this end\, this 
 presentation examines the physical and chemical aspects of injected partic
 les under the harsh conditions in the stratosphere. Particular emphasis is
  placed on the impact of aerosol injection on the global ozone layer\, com
 paring injections of sulfuric acid droplets and of solid materials\, and a
 ssessing the relative risks and uncertainties associated with each.\n\nBio
 graphy:\nTom Peter is Professor Emeritus of Atmospheric Chemistry at the I
 nstitute for Atmosphere and Climate at ETH Zurich.  With his research gro
 up\, he investigated the fundamentals of aerosols and clouds\, their physi
 cal processes and chemical reactions\, their influence on the composition 
 of the air\, on the global atmosphere and on Earth’s climate.\n\n 
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/69011077410
STATUS:CONFIRMED
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