Projects per year
Abstract
The observed seasonal cycles of a selection of reactive hydrocarbons in baseline air masses at Mace Head, Ireland are consistent with a simple picture of largely man-made sources and oxidation by hydroxyl (OH) radicals. M a result, the observed seasonal cycles become more pronounced the more reactive the species are with OH. For the pentanes, the assumption of little wintertime removal breaks down, leading to an apparent dampening of the seasonal cycles relative to ethane, propane and the butanes. A global chemistry-transport model is used to describe the seasonal cycles of the hydrocarbons at Mace Head and provided an accurate description of their observed amplitudes and phases. The model derived local OH concentrations in baseline air masses required to support the observed seasonal cycles of the hydrocarbons averaged 1.38 +/- 1.1 x 10(6) molecule cm(-3). Peak daytime levels during summertime reached 12 x 10(7) molecule cm(-3). (C) 2012 Elsevier Ltd. All rights reserved.
Original language | English |
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Pages (from-to) | 89-96 |
Number of pages | 8 |
Journal | Atmospheric Environment |
Volume | 62 |
DOIs | |
Publication status | Published - Dec 2012 |
Keywords
- C-2-C-5 hydrocarbons
- Seasonal cycles
- OH
- IN-SITU MEASUREMENTS
- NONMETHANE HYDROCARBONS
- GLOBAL DISTRIBUTION
- BOUNDARY-LAYER
- HO2 RADICALS
- TROPOSPHERE
- EMISSION
- ATLANTIC
- HALOCARBONS
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Dive into the research topics of 'Seasonal cycles in short-lived hydrocarbons in baseline air masses arriving at Mace Head, Ireland'. Together they form a unique fingerprint.Projects
- 5 Finished
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Isoprene oxidation and OH recycling
Shallcross, D. E. (Principal Investigator)
1/10/12 → 1/10/15
Project: Research
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Laboratory studies of Criegee radical reactions
Shallcross, D. E. (Principal Investigator)
14/03/11 → 14/03/14
Project: Research
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The gas phase atmospheric photolysis and reactions of key alkyl nitrates and their role in NOy partitioning.
Shallcross, D. E. (Principal Investigator) & Orr-Ewing, A. J. (Co-Principal Investigator)
1/10/09 → 1/04/13
Project: Research