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Po-Fat Yuen
,
Dean A. Hegg
, and
Timothy V. Larson

Abstract

Model calculations am presented for continental scenarios that demonstrate that the heterogeneity in the chemistry of different size cloud drops can have a significant impact on the amount of sulfate produced in cloud, its size distribution, and the consequent integral light-scattering efficiency of sulfate. The results are contrasted with previous calculations for a marine scenario.

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Po-Fat Yuen
,
Dean A. Hegg
,
Timothy V. Larson
, and
Mary C. Barth

Abstract

Comparison of in-cloud sulfate production by a bulk-parameterized cloud model, a modified bulk parameterized model, and an explicit microphysical model for a wide variety of scenarios has been used as the basis for deriving a parameterization of the effects of heterogeneous cloud chemistry on in-cloud sulfate production. The parameterization, essentially a transfer function relating bulk and explicit model predictions, can be easily employed in large-scale Eulerian cloud models and has been demonstrated to have significant impact on predictions of sulfate deposition.

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