References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-8-10955-2008

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

Makkonen

¹ Asmi

¹ Korhonen

² Kokkola

³ Järvenoja

⁴ ⁷ Räisänen

⁴ Lehtinen

K. E. J.

² ⁵ Laaksonen

² ⁵ Kerminen

V.-M.

⁴ Järvinen

⁴ Lohmann

⁶ Feichter

³ Kulmala

Department of Physics, University of Helsinki, FI-00014, Helsinki, Finland

Department of Physics, University of Kuopio, FI-70211, Kuopio, Finland

Max Planck Institute for Meteorology, D-20146, Hamburg, Germany

Finnish Meteorological Institute, FI-00101, Helsinki, Finland

Finnish Meteorological Institute, FI-70211, Kuopio, Finland

Institute of Atmospheric and Climate Science, ETH Zurich, CH-8092, Zurich, Switzerland

deceased, October 2007

06 06 2008

8 3 10955 10998

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The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce observed nucleation rates in lower troposphere. A simple and computationally efficient model for biogenic secondary organic aerosol (BSOA) formation was implemented. We studied the sensitivity of aerosol and cloud droplet number concentrations (CDNC) to these additions. Activation-type nucleation significantly increases aerosol number concentrations in the boundary layer. Increased particle number concentrations have a significant effect also on cloud droplet number concentrations and therefore on cloud properties. We performed calculations with activation nucleation coefficient values of 2×10-7 s−1, 2×10-6 s-1 and 2×10-5 s−1 to evaluate the sensitivity to this parameter. For BSOA we have used yields of 0.025, 0.07 and 0.15 to estimate the amount of monoterpene oxidation products available for condensation. The dynamic SOA scheme induces large regional changes to size distribution of organic carbon, and therefore affects particle optical properties and cloud droplet number concentrations locally. Comparison with satellite observation shows that activation-type nucleation significantly decreases the differences between observed and modeled values of cloud top CDNC.

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