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SUMMARY:The Influence of Anthropogenic Aerosol on Multi-Decadal Variations
  of Climate - Dr Laura Wilcox (Reading)
DTSTART:20140609T131500Z
DTEND:20140609T143000Z
UID:TALK51723@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:Aerosol presents a large source of uncertainty in climate simu
 lations. It is important to gauge which aspects of aerosol-climate interac
 tion contribute to uncertainty to enable effort to be prioritized\, and to
  constrain uncertainty to facilitate sound decisions on future policy.\n\n
 We show that climate models with a representation of the indirect effect o
 f aerosol better reproduce inter-decadal variability in historical global-
 mean near-surface temperatures compared to models representing the direct 
 effect only. Analysis of single forcing runs from CMIP5 shows that the mid
 -20th century temperature hiatus is likely to have been influenced strongl
 y by anthropogenic aerosol forcing.\n\nAs well as global impacts\, aerosol
  can have a pronounced influence on local climate. Using case studies of r
 egions that have large responses to aerosol forcing\, we investigate the s
 ensitivity of atmospheric metrics to aerosol changes. We find a large rang
 e of sensitivities to aerosol perturbations\, as well as considerable diff
 erences in the mass loading of some species. This inter-model diversity ca
 n produce substantial variation in simulations of climate variability on m
 ulti-decadal timescales.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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