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HO x observations over West Africa during AMMA : impact of isoprene and NO x
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stone, Daniel T. Evans, Mathew J. Commane, Róisín Ingham, Trevor Floquet, Cedric F. A. McQuaid, J. B. Brookes, David Michael Monks, Paul S. Purvis, R. M. Hamilton, Jacqueline F. Hopkins, Jim Lee, James D. Lewis, Alistair C. Stewart, Dave Murphy, Jennifer G. Mills, Graham Oram, David Reeves, C. E. Heard, Dwayne E. |
| Copyright Year | 2010 |
| Abstract | Aircraft OH and HO2 measurements made over West Africa during the AMMA field campaign in summer 2006 have been investigated using a box model constrained to observations of long-lived species and physical parameters. “Good” agreement was found for HO 2 (modelled to observed gradient of 1 .23± 0.11). However, the model significantly overpredicts OH concentrations. The reasons for this are not clear, but may reflect instrumental instabilities affecting the OH measurements. Within the model, HOx concentrations in West Africa are controlled by relatively simple photochemistry, with production dominated by ozone photolysis and reaction of O( 1D) with water vapour, and loss processes dominated by HO 2 + HO2 and HO2+RO2. Isoprene chemistry was found to influence forested regions. In contrast to several recent field studies in very low NOx and high isoprene environments, we do not observe any dependence of model success for HO 2 on isoprene and attribute this to efficient recycling of HO x through Correspondence to: M. J. Evans (m.j.evans@leeds.ac.uk) RO2+NO reactions under the moderate NO x concentrations (5–300 ppt NO in the boundary layer, median 76 ppt) encountered during AMMA. This suggests that some of the problems with understanding the impact of isoprene on atmospheric composition may be limited to the extreme low range of NOx concentrations. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www2.le.ac.uk/departments/chemistry/research/atmospheric-chemistry-1/pfd-publications-may2010/10-ACPStoneAMMAHOx.pdf |
| Alternate Webpage(s) | https://www.atmos-chem-phys.net/10/9415/2010/acp-10-9415-2010.pdf |
| Alternate Webpage(s) | http://centaur.reading.ac.uk/7934/1/acp-10-9415-2010.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Amma Atmosphere, unit of pressure Chem mart Moclobemide Consortium EMC Atmos Ephrin Type-B Receptor 1, human European Union FD&C yellow no. 6 Gradient Halobacteriaceae archaeon HO2-1 Heme Oxygenase (Decyclizing) Hydroxyl Radical Ozone Photochemistry Q-Chem Recycling Trichechus manatus isoprene photolysis |
| Content Type | Text |
| Resource Type | Article |
