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

作者：Donahue Neil M^*; Henry Kaytlin M; Mentel Thomas F; Kiendler Scharr Astrid; Spindler Christian; Bohn Birger; Brauers Theo; Dorn Hans P; Fuchs Hendrik; Tillmann Ralf; Wahner Andreas; Saathoff Harald; Naumann Karl Heinz; Moehler Ottmar; Leisner Thomas; Mueller Lars; Reinnig Marc Christopher; Hoffmann Thorsten; Salo Kent; Hallquist Mattias; Frosch Mia; Bilde Merete; Tritscher Torsten; Barmet Peter; Praplan Arnaud P; DeCarlo Peter F; Dommen Josef; Prevot Andre S H

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

DOI：10.1073/pnas.1115186109

• atmospheric chemistry
• biosphere-atmosphere interactions

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.

• 出版日期2012-8-21