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SUMMARY:Uncertainties in estimates of the aerosol radiative effects – Ef
 ficiency of primary and secondary aerosols. - Dr Philip Stier
DTSTART:20081020T131500Z
DTEND:20081020T141500Z
UID:TALK11879@talks.cam.ac.uk
CONTACT:Paul Young
DESCRIPTION:Atmospheric aerosols play an important role in the global clim
 ate system through modifications of the global radiation budget: directly\
 , by scattering and absorption of radiation and indirectly\, by the modifi
 cation of cloud properties and abundance. In particular the indirect aeros
 ol effects on clouds are subject to large uncertainties. \n\nGlobal aeroso
 l-cloud climate models allow quantitative estimates\, albeit uncertain\, o
 f anthropogenic aerosol radiative effects. In this study we investigate ae
 rosol effects through modelling studies with the ECHAM5-HAM aerosol-climat
 e model with microphysical representation of aerosol-cloud interactions: u
 tilizing its prognostic aerosol size-distribution\, mixing state and cloud
  droplet number concentration to explicitly couple the aerosol and cloud s
 ystems. \n\nHere\, our focus is on the different efficiencies of primary a
 nd secondary aerosols in perturbing the global radiation balance. Our resu
 lts help reduce uncertainties in estimates of the aerosol radiative effect
 s and provide valuable information for the necessary level of detail in th
 e microphysical process representation in global climate models.  \n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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