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National Academy of Sciences, Proceedings of the National Academy of Sciences, 34(109), p. 13503-13508, 2012

DOI: 10.1073/pnas.1115186109

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Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions

Journal article published in 2012 by Neil M. Donahue ORCID, Kaytlin M. Henry, Thomas F. Mentel, Astrid Kiendler-Scharr, Christian Spindler, Birger Bohn, Theo Brauers ORCID, Hans P. Dorn, Hendrik Fuchs ORCID, Ralf Tillmann ORCID, Andreas Wahner, Harald Saathoff, Karl-Heinz Naumann, Ottmar Möhler, Thomas Leisner and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described by a mechanism suitable for implementation in those models.