Atmospheric concentrations of nonmethane hydrocarbons at a North European coastal site |
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Authors: | Øystein Hov Norbert Schmidbauer |
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Institution: | (1) Department of Geophysics, University of Bergen, Allégaten 70, N-5007 Bergen;(2) Norwegian Institute for Air Research, P.O.Box 64, N-2001 Lillestrøm |
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Abstract: | Two years of individual nonmethane hydrocarbon (NMHC) measurements at a rural site close to the south coast of Norway show that there was a distinct annual cycle with a late winter maximum and late summer minimum in the slowly reacting NMHCs acetylene, ethane, propane and i- and n-butane. The average January—March concentrations were a factor 2–4 higher than the July-September concentrations. Also ethene, propene and the pentanes show a similar annual cycle, but the individual scatter in the measurements in particular of propene, is large. The highest concentrations of NMHC were found in winter for easterly transport on a regional scale (out to 1500 km from the site), and for southeasterly transport in the summer. |
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Keywords: | Nonmethane hydrocarbons seasonal variation photochemical oxidants Europe |
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