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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2672
DTSTART:20130503T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T041542Z
LAST-MODIFIED:20131001T133237Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Pursuing Climate Science:  From Small Particles to Large Airpl
 anes\, Physics Department Colloquium\, David Fahey\, Earth System Rese
 arch Laboratory\, National Oceanic & Atmospheric Administration
DESCRIPTION:I will present two topics to highlight how my NOAA researc
 h contributes to climate change science.  First\, black carbon particl
 es play a complex role in our climate system.  Refractory black carbon
  is the primary cause of aerosol optical absorption in the atmosphere 
 and also changes cloud properties and snow and ice albedo.  Large gaps
  exist in our ability to measure and model black carbon abundances and
  climate effects.  I helped lead a recently published assessment* whic
 h is the first evaluation of black-carbon climate forcing that is comp
 rehensive in its inclusion of all known and relevant processes and tha
 t is quantitative in providing best estimates and uncertainties of the
  main forcing terms.  Second\, the Global Hawk unmanned aircraft syste
 m (UAS)**\, the worldaEuroTMs largest\, can travel 10000 nm on 30-hr f
 lights at altitudes up to 20 km.  In an ongoing flight campaign\, our 
 principal objective is to advance understanding of processes occurring
  in the tropical tropopause layer related to water vapor and ice cloud
 s.  These processes control stratospheric humidity\, which plays an im
 portant role in EarthaEuroTMs radiation budget and stratospheric photo
 chemistry.  The data from recent tropical flights demonstrate the grea
 t potential of Global Hawk for Earth science research. * http://online
 library.wiley.com/doi/10.1002/jgrd.50171/abstract ** http://espo.nasa.
 gov/missions/attrex/
URL:https://www.physics.wisc.edu/events/?id=2672
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