Predicting global aerosol size distributions in general circulation models

Peter J. Adams; John H. Seinfeld

doi:10.1029/2001jd001010

journal article Oct 04, 2002

Predicting global aerosol size distributions in general circulation models

Peter J. Adams John H. Seinfeld

Journal of Geophysical Research: Oceans Vol. 107 No. D19 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/2001jd001010

Abstract

To better represent the indirect effect of aerosols on climate, a size‐resolved simulation of aerosol microphysics, size distributions, number and mass concentrations has been incorporated into the GISS general circulation model (GCM). The TwO‐Moment Aerosol Sectional (TOMAS) microphysics model used here conserves aerosol number as well as mass. It has high size resolution, 30 bins between 0.01 and 10 μm diameter. As a first application, a size‐resolved simulation of sulfate has been performed. The model reproduces important features of the atmospheric aerosol such as number concentrations that increase with altitude and land‐sea contrasts in aerosol number concentrations and size distributions. Comparisons with observations show that simulated size distributions are realistic and condensation nuclei (CN) concentrations agree with observations within about 25%. Predicted cloud condensation nuclei (CCN) concentrations are also in reasonable agreement with observations, although there are locations for which agreement would be improved by including other aerosol components such as sea salt and carbonaceous aerosols. Sensitivity scenarios show that uncertainties in nucleation and primary emissions from fossil fuels can have significant effects on predictions of CN and CCN concentrations.

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Details

Published: Oct 04, 2002
Vol/Issue: 107(D19)
License: View

Authors

P

Peter J. Adams

Department of Civil and Environmental Engineering and Department of Engineering and Public Policy Carnegie Mellon University Pittsburgh Pennsylvania USA

J

John H. Seinfeld

Department of Chemical Engineering California Institute of Technology Pasadena California USA

Cite This Article

Peter J. Adams, John H. Seinfeld (2002). Predicting global aerosol size distributions in general circulation models. Journal of Geophysical Research: Oceans, 107(D19). https://doi.org/10.1029/2001jd001010

Predicting global aerosol size distributions in general circulation models

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