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Science. 2002 Oct 25;298(5594):814-7.

Heterogeneous atmospheric aerosol production by acid-catalyzed particle-phase reactions.

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1
Department of Environmental Sciences and Engineering, CB 7431, Rosenau Hall, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. mjang@email.unc.edu

Abstract

According to evidence from our laboratory, acidic surfaces on atmospheric aerosols lead to potentially multifold increases in secondary organic aerosol (SOA) mass. Experimental observations using a multichannel flow reactor, Teflon (polytetrafluoroethylene) film bag batch reactors, and outdoor Teflon-film smog chambers strongly confirm that inorganic acids, such as sulfuric acid, catalyze particle-phase heterogeneous reactions of atmospheric organic carbonyl species. The net result is a large increase in SOA mass and stabilized organic layers as particles age. If acid-catalyzed heterogeneous reactions of SOA products are included in current models, the predicted SOA formation will be much greater and could have a much larger impact on climate forcing effects than we now predict.

PMID:
12399587
DOI:
10.1126/science.1075798
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