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Abstract

We have investigated the potential of upper tropospheric cloud condensation nuclei (CCN) formation from sulphur dioxide. This process involves three steps including SO(2) conversion to gaseous sulphuric acid (GSA), homogeneous bimolecular nucleation of GSA and water vapour leading to new aerosol particles, and new aerosol particle growth via mutual coagulation and GSA-H(2)O condensation.

Our investigation includes both measurements of SO(2) and GSA as well as model calculations of SO(2) conversion to new aerosol particles in the presence of pre-existing aerosols which act as a competing sink for GSA. The model reproduces the measured abundance ratio GSA-SO(2) reasonably well. Furthermore, the model predicts that efficient upper tropospheric CCN formation from SO(2) may, in fact, occur under certain plausible conditions. These conditions are explored utilizing the factor Fccn, defined as a ratio of the source and sink terms of gaseous sulphuric acid. In particular, a threshold Fccn value for efficient CCN formation is calculated with the model. .

Additional information

Authors: LAAKSONEN A, Department of Applied Physics, University of Kuopio, (FI);PIRJOLA L, Department of Physics, University of Helsinki (FI);KULMALA M, Department of Physics, University of Helsinki (FI);WOHLFROM K-H, Atmospheric Physics Division, Max-Planck-Institute for Nuclear Physics, Heidelberg (DE);ARNOLD F, Atmospheric Physics Division, Max-Planck-Institute for Nuclear Physics, Heidelberg (DE);RAES F, Environment Institute, Comission of the European Communities Ispra (IT)
Bibliographic Reference: An article published in: Journal of Geophysical Research. Vol.105, No.D1. Pp.1459-1469
Availability: An article published in: Journal of Geophysical Research. Vol.105, No.D1. Pp.1459-1469
Record Number: 200013371 / Last updated on: 2001-06-27
Category: PUBLICATION
Original language: en
Available languages: en