TITLE

From aerosol microphysics to geophysics using the method of moments

AUTHOR(S)
McGraw, R.; Wright, D. L.; Benkovitz, C. M.; Schwartz, S. E.
PUB. DATE
August 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p785
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe new developments in the application of the Quadrature Method of Moments (QMOM). These include the first application of the QMOM in a 3-D chemical transformation and transport model on the sub-hemispheric scale. The QMOM simultaneously tracks an arbitrary (even) number of moments of a particle size distribution directly in space and time without the need for explicitly representing the distribution itself. The present implementation evolves the six lowest-order radial moments for each of several externally-mixed aerosol populations. From these moments we report modeled geographic distributions of several aerosol properties, including a shortwave radiative forcing obtained using the Multiple Isomomental Distribution Aerosol Surrogate (MIDAS) technique. These results demonstrate the capabilities of these moment-based techniques to simultaneously represent aerosol nucleation, condensation, coagulation, dry deposition, wet removal, cloud activation, and transport processes in a large-scale model, and to yield aerosol optical properties and radiative influence from the modeled aerosol moments. We report on recent extensions of the method for simulation of internal mixtures and generally-mixed aerosols, and on a bivariate extension of the QMOM for modeling simultaneous coagulation and sintering of particle populations.
ACCESSION #
5669648

 

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