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An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado

An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado. Ezra Levin A.J. Prenni, S.M. Kreidenweis, M.D. Petters, R.C. Sullivan, S.A. Atwood, J. Ortega, P.J. DeMott and J.N. Smith Funded by: NSF (ATM-0919042) AMS Annual Meeting 1/24/12. BEACHON.

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An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado

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  1. An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado Ezra Levin A.J. Prenni, S.M. Kreidenweis, M.D. Petters, R.C. Sullivan, S.A. Atwood, J. Ortega, P.J. DeMott and J.N. Smith Funded by: NSF (ATM-0919042) AMS Annual Meeting 1/24/12

  2. BEACHON (Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics & Nitrogen) What are the impacts of biogenic emissions on aerosol hygroscopicity and CCN concentrations?

  3. Regional aerosol We expect biogenic organics to be important, especially in the summer Modern C 45% 21% Fossil C [Levin et al, 2009; Schichtelet al, 2008]

  4. Size resolved cloud condensation nuclei Total N CCN Dc

  5. Hygroscopicity parameter: kappa κ = 0.1 SOA κ = 0.6 Ammonium Sulfate [Petters and Kreidenweis, 2007]

  6. Kappa timeline Activation Diameter Kappa 48 ± 3 0.13 ± 0.04 0.14 ± 0.05 54 ± 5 Low kappa indicates large organic component 0.15 ± 0.05 66 ± 2 85 ± 3 0.17 ± 0.06 147 ± 14 0.22 ± 0.12

  7. Kappa and CCN have a seasonal cycle Largest particles are more variable. Smallest particles consistently low. Why do kappa and CCN change with season and size?

  8. New particle formation

  9. New particle formation At larger diameters, New particles have lower hygroscopicity.

  10. New particle formation SOA NPF affects aerosol hygroscopicity and CCN concentration.

  11. Conclusions The aerosol in Manitou Forest is highly organic dominated. New particle formation appears to depress kappa but increase CCN. It is likely that the new CCN have a large biogenic organic component, thus linking the biosphere, hydrosphere and atmosphere.

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