期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 48, 期 3, 页码 1618-1627出版社
AMER CHEMICAL SOC
DOI: 10.1021/es4042622
关键词
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资金
- Office of Science (Office of Biological and Environmental Research), U.S. Department of Energy [DE-SC0006431]
- National Science Foundation [CHE1038028]
- U.S. Department of Energy (DOE) [DE-SC0006431] Funding Source: U.S. Department of Energy (DOE)
The rates of heterogeneous reactions of trace gases with aerosol particles are complex functions of particle chemical composition, morphology, and phase state. Currently, the majority of model parametrizations of heterogeneous reaction kinetics focus on the population average of aerosol particle mass, assuming that individual particles have the same chemical composition as the average state. Here we assess the impact of particle mixing state on heterogeneous reaction kinetics using the N2O5 reactive uptake coefficient, gamma(N2O5), and dependence on the particulate chloride-to-nitrate ratio (nCl(-)/nNO(3)(-)). We describe the first simultaneous ambient observations of single particle chemical composition and in situ determinations of gamma(N2O5). When accounting for particulate (nCl(-)/nNO(3)(-)) mixing state, model parametrizations of gamma(N2O5) continue to overpredict gamma(N2O5) by more than a factor of 2 in polluted coastal regions, suggesting that chemical composition and physical phase state of particulate organics likely control gamma(N2O5) in these air masses. In contrast, direct measurement of gamma(N2O5) in air masses of marine origin are well captured by model parametrizations and reveal limited suppression of gamma(N2O5), indicating that the organic mass fraction of fresh sea spray aerosol at this location does not suppress gamma(N2O5). We provide an observation-based framework for assessing the impact of particle mixing state on gas-particle interactions.
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