Atmos. Chem. Phys. Discuss., 5, 10197-10216, 2005
www.atmos-chem-phys-discuss.net/5/10197/2005/
doi:10.5194/acpd-5-10197-2005
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
The influence of nitric acid on the cloud processing of aerosol particles
S. Romakkaniemi1, H. Kokkola1, K. E. J. Lehtinen2, and A. Laaksonen1
1Department of Applied Physics, University of Kuopio, P.O. BOX 1627, FIN-70211 Kuopio, Finland
2University of Kuopio and Finnish Meteorological Institute, Department of Applied Physics, P.O. BOX 1627, FIN-70211 Kuopio, Finland

Abstract. In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by condensed nitric acid as nitric acid increases the number of cloud droplets, which will lead to smaller mean size and higher total surface area of droplets. Increased acidity due to HNO3 affects the H2SO4 production. As a result of increased cloud droplet number concentration (CDNC), the incloud coagulation rate is enhanced, so that the number of interstitial particles reduces faster. In addition, sulfuric acid production occurs in smaller particles and this will lead to higher number of particles in the accumulation mode.

Citation: Romakkaniemi, S., Kokkola, H., Lehtinen, K. E. J., and Laaksonen, A.: The influence of nitric acid on the cloud processing of aerosol particles, Atmos. Chem. Phys. Discuss., 5, 10197-10216, doi:10.5194/acpd-5-10197-2005, 2005.
 
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