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This paper investigates the formation and growth of aerosol sulfate particles in the atmosphere. The evolution of the aerosol size distribution with time was modelled using the aerosol general dynamic equation. This equation was solved numerically using a discrete-nodal point method to describe the particle size distribution. The initial size distribution uses an average urban accumulation mode. The first step evaluates the oxidation of SO(2) by OH radicals, producing H(2)SO(4)(g). The next step considers the binary nucleation and condensation of the H(2)SO(4)-H(2)O system and its evolution due to coagulation and deposition mechanisms. The mass size distribution at different distances during the transport of the initial aerosol size distribution is presented. The importance of different mechanisms on the evolution of the aerosol size distribution is discussed. Sensitivity analysis was performed for many model parameters and simulations were done at varying temperature, relative humidity and photo-oxidation rate conditions. Model calculations suggest that condensation growth is the dominant mechanism for the evolution of the size distribution of sulfate particles during moderate relative humidity conditions.

Additional information

Authors: LAZARIDIS M, JRC Ispra (IT);KOUTRAKIS P, Harvard University, Boston (US)
Bibliographic Reference: Paper presented: Particulate Matter : Health and Regulatory Issues, Pittsburgh (US), April 4-6, 1995
Availability: Available from (1) as Paper EN 38943 ORA
Record Number: 199510677 / Last updated on: 1995-07-07
Original language: en
Available languages: en