Evidence for an Oceanic Source of Methyl Ethyl Ketone to the Atmosphere

Autor: J. F. Brewer, E. V. Fischer, R. Commane, S. C. Wofsy, B.C. Daube, E. C. Apel, A. J. Hills, R. S. Hornbrook, B. Barletta, S. Meinardi, D. R. Blake, E. A. Ray, A. R. Ravishankara
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Geophysical Research Letters, Vol 47, Iss 4, Pp n/a-n/a (2020)
Druh dokumentu: article
ISSN: 1944-8007
0094-8276
DOI: 10.1029/2019GL086045
Popis: Abstract Methyl ethyl ketone (MEK) is a relatively abundant but understudied oxygenated volatile organic compound that can serve as a source of both HOx and PAN when photooxidized. We use aircraft observations of MEK from the remote marine troposphere to show that the ocean serves as a source of MEK to the atmosphere during both meteorological winter and summer. There is pronounced seasonality in the MEK profiles in the extratropical troposphere, with higher MEK mixing ratios observed in summer than in winter. MEK in clean air over the remote oceans correlates with both acetone and acetaldehyde, whose primary sources in the ocean water are the photooxidation of organic material. We show that even a small (>1 nM) concentration of MEK in surface waters is sufficient to allow the ocean to be a net source of MEK to the atmosphere over ocean basins across multiple seasons.
Databáze: Directory of Open Access Journals
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