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Global distribution of peroxyacetyl nitrate

Nature volume 321, pages 588–591 (1986)Cite this article

Abstract

Nitrogen oxides (NOx) have a central role in the chemistry of the atmosphere, especially in key processes relating to ozone, hydroxyl-radical (OH) and acid formation1–7. High reactivity of NOx (lifetime of 0.5–2 days) precludes hemispheric-scale transport and it has been proposed that non-methane hydrocarbons present in the troposphere can transform NOx into its organic forms principally as peroxyacetyl nitrate (PAN)8,9. PAN is highly stable in the colder regions of the middle and upper troposphere and can provide a mechanism for NOx storage and transport. Once transported, PAN and its homologues can easily release free NOx in warmer atmospheric conditions. PAN is probably ubiquitous and its concentrations could exceed those of NOx in clean tropospheric conditions10–12. Here we present the first view of the global distribution of PAN based on extensive shipboard and aircraft measurements. PAN is more abundant in the Northern than in the Southern Hemisphere and in the continental than in the marine troposphere. In contrast to its behaviour in polluted atmospheres, PAN mixing ratios in winter greatly exceed those in summer. These measurements provide a basis for assessing the significance of PAN as a reservoir of NOx and for extending and validating reactive nitrogen chemistry theory in the troposphere.

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Authors and Affiliations

  1. NASA-Ames Research Center, Moffett Field, California, 94306, USA

    Hanwant B. Singh

  2. SRI International, Menlo Park, California, 94025, USA

    Louis J. Salas & William Viezee

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  1. Hanwant B. Singh
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  2. Louis J. Salas
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  3. William Viezee
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Singh, H., Salas, L. & Viezee, W. Global distribution of peroxyacetyl nitrate. Nature 321, 588–591 (1986). https://doi.org/10.1038/321588a0

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