References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-1747-2009

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 ⁸ Räisänen

⁴ Lehtinen

K. E. J.

² ⁵ Laaksonen

² ⁵ Kerminen

V.-M.

⁴ Järvinen

⁴ Lohmann

⁶ Bennartz

⁷ Feichter

³ Kulmala

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

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

Max Planck Institute for Meteorology, 20146, Hamburg, Germany

Finnish Meteorological Institute, 00101, Helsinki, Finland

Finnish Meteorological Institute, 70211, Kuopio, Finland

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

Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, Wisconsin, USA

deceased, October 2007

09 03 2009

9 5 1747 1766

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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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 the lower troposphere. A simple and computationally efficient model for biogenic secondary organic aerosol (BSOA) formation was implemented. Here we study the sensitivity of the 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 2×10−7s−1, 2×10−6s−1 and 2×10−5s−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 hybrid BSOA formation scheme induces large regional changes to size distribution of organic carbon, and therefore affects particle optical properties and cloud droplet number concentrations locally. Although activation-type nucleation improves modeled aerosol number concentrations in the boundary layer, the use of a global activation coefficient generally leads to overestimation of aerosol number. Overestimation can also arise from underestimation of primary emissions.

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