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- Title
ROOOH: the Missing Piece of the Puzzle for OH measurements in low NO Environments.
- Authors
Fittschen, Christa; Ajami, Mohamad Al; Batut, Sebastien; Ferracci, Valerio; Archer-Nicholls, Scott; Archibald, Alexander T.; Schoemaecker, Coralie
- Abstract
Field campaigns have been carried out with the FAGE technique in remote biogenic environments in the last decade to quantify the in situ" concentrations of OH, the main oxidant in the atmosphere. These data have revealed concentrations of OH radicals up to a factor of 10 higher than predicted by models, whereby the disagreement increases with decreasing NO concentration. This was interpreted as a major lack in our understanding of the chemistry of biogenic VOCs, particularly isoprene, which are dominant in remote pristine conditions. But interferences in these measurements of unknown origin have also been discovered for some FAGE instruments. We present in this paper convincing experimental and modeling evidence that the disagreement between model and measurement is due to interference by the unexpected decomposition of a new class of molecule, ROOOH, in the FAGE instruments. Including ROOOH reflects the missing piece of the puzzle in our understanding of OH in the atmosphere.
- Subjects
NITROGEN oxides &; the environment; HYDROXYL group; ATMOSPHERIC models; REMOTE sensing; VOLATILE organic compounds &; the environment
- Publication
Atmospheric Chemistry & Physics Discussions, 2018, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2018-441