The seasonal cycles and photochemistry of C-2-C-5 alkanes at Mace Head

Continuous in-situ measurements of NMHCs at Mace Head, Ireland during two full annual cycles from January 2005 to January 2007 were used to investigate NMHC emission sources and transport including dilution and photochemical oxidation. The Mace Head research station is ideally located to sample a wi...

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Bibliographic Details
Published in:Atmospheric Environment
Main Authors: Yates, Emma L., Derwent, Richard G., Simmonds, Peter G., Greally, Brian R., O'Doherty, Simon, Shallcross, Dudley E.
Format: Article in Journal/Newspaper
Language:English
Published: 2010
Subjects:
Arctic
North Atlantic
Online Access:https://hdl.handle.net/1983/3648c0b0-a67f-4956-b091-63c44202cc52
https://research-information.bris.ac.uk/en/publications/3648c0b0-a67f-4956-b091-63c44202cc52
https://doi.org/10.1016/j.atmosenv.2010.04.043
Description
Summary:Continuous in-situ measurements of NMHCs at Mace Head, Ireland during two full annual cycles from January 2005 to January 2007 were used to investigate NMHC emission sources and transport including dilution and photochemical oxidation. The Mace Head research station is ideally located to sample a wide range of air masses including polluted European transport, clean North Atlantic and Arctic air masses and the ultra-clean, Southern Atlantic air masses. The variety in air mass sampling is used to investigate interaction of emissions, transport, dilution and photochemistry. Variability of long-lived hydrocarbon ratios is used to assess and estimate typical transport times from emission source to the Mace Head receptor. Seasonality in the ratios of isomeric alkane pairs (for butane and pentanes) are used to assess the effects of atmospheric transport and photochemical ageing. Finally, the natural logarithms of NMHC ratios are used to assess photochemical oxidation. (C) 2010 Elsevier Ltd. All rights reserved.

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