BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:EAPS DLS - Special Lecture - Tapio Schneider (CalTech)
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260716T112721Z
UID:tag:localist.com\,2008:EventInstance_31468772085777
DTSTART:20191002T130000Z
DTEND:20191002T140000Z
DESCRIPTION:About this Series\n\nThe EAPS Department Lecture Series sponsor
 s talks given by leading thinkers in the areas of geology\, geophysics\, g
 eobiology\, geochemistry\, atmospheric science\, oceanography\, climatolog
 y\, and planetary science. Lectures take place on Wednesdays from 3:45pm i
 n MIT Building 54 room 915\, unless otherwise noted. This Lecture is part 
 of a Special DLS Series in tandem with the Climate Symposium. \nTitle:\n\n
 Possible stratocumulus surprises in warm climates and geoengineering impli
 cations\n\nAbstract:\n\nStratocumulus cloud decks over subtropical oceans 
 are vulnerable to changes in longwave cooling: They are sustained by longw
 ave  cooling at their cloud tops\, which drives turbulent air motions from
  the cloud tops downward and thereby couples stratocumulus decks to their 
 moisture supply at the surface. This longwave cooling weakens as greenhous
 e gases (GHG) accumulate in the atmosphere\, raising questions about how s
 tratocumulus clouds will respond to increased GHG levels. Yet stratocumulu
 s clouds are notoriously poorly captured in current climate models\, makin
 g it difficult to study their response to increasing GHG levels in global 
 models. \n\nWe invert the standard approach in climate modeling: Instead o
 f simulating the large-scale dynamics of the atmosphere explicitly while r
 epresenting the important smaller-scale dynamics of clouds semi-empiricall
 y\, as is common\, we simulate the dynamics of clouds explicitly and repre
 sented large-scale dynamics semi-empirically. In idealized global-warming 
 simulations\, we show that subtropical marine stratocumulus decks can beco
 me unstable and break up at CO2 concentrations above around 1\,200~ppm\, t
 riggering global warming of up to about 8 K in addition to the warming tha
 t arose from the elevated CO2 concentrations before the clouds broke up. W
 e also show that the same instability and breakup of stratocumulus clouds 
 can still occur in a solar geoengineering scenario\, in which GHG concentr
 ations rise while their top-of-atmosphere effect is offset by manipulating
  the amount of sunlight Earth absorbs. This highlights a previously unreco
 gnized risk of solar geoengineering\, stemming from the direct effect of G
 HG on clouds.
GEO:42.360158;-71.089183
LOCATION:Building 54\, 915/923
SUMMARY:EAPS DLS - Special Lecture - Tapio Schneider (CalTech)
URL;VALUE=URI:https://calendar.mit.edu/event/eaps_dls_-_special_lecture_-_r
 ay_pierrehumbert_oxford
CATEGORIES:Conferences/Seminars/Lectures
END:VEVENT
END:VCALENDAR