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SUMMARY:Quantifying global aircraft black carbon emissions - Dr Marc Stett
 ler\, Hopkinson Lab
DTSTART:20131115T110000Z
DTEND:20131115T120000Z
UID:TALK47764@talks.cam.ac.uk
CONTACT:Simone Hochgreb
DESCRIPTION:Aircraft black carbon (BC) emissions contribute to climate for
 cing\, but few estimates of BC emitted by aircraft at cruise exist. For th
 e majority of aircraft engines the only BC related measurement available i
 s smoke number (SN)\, a filter based optical method designed to measure ne
 ar-ground plume visibility. It is shown that existing methods that estimat
 e BC mass emissions normalized by fuel burn [EI(BC)] from SN significantly
  underestimate EI(BC) near airports and at cruise. As there are no plans t
 o measure BC emissions from all existing certified engines\, which will be
  in service for several decades\, it is necessary to estimate EI(BC) for e
 xisting aircraft. An alternative method that is based on a semi-empirical 
 representation of soot formation and oxidation\, called FOX\, is developed
  to estimate aircraft BC mass and number emissions. Estimates of EI(BC) at
  ground level are significantly improved\, whereas estimates at cruise are
  within 30% of measurements. Implementing this approach for global civil a
 viation estimated aircraft BC emissions are revised upward by a factor of 
 ∼3. Direct radiative forcing (RF) due to aviation BC emissions is estima
 ted to be ∼9.5 mW/m2\, equivalent to ∼1/3 of the current RF due to avi
 ation CO2 emissions.
LOCATION:Hopkinson Meeting Room\, Engineering Department
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