In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 105, No. D1 ( 2000-01-20), p. 1459-1469
Abstract:
We have investigated the potential of upper tropospheric cloud condensation nuclei (CCN) formation from sulfur dioxide. This process involves three steps including SO 2 conversion to gaseous sulfuric acid (GSA), homogeneous bimolecular nucleation of GSA and water vapor 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 preexisting 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 F CCN , defined as a ratio of the source and sink terms of gaseous sulfuric acid. In particular, a threshold F CCN value for efficient CCN formation is calculated with the model.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/1999JD900933
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2000
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