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Oxidant and particle photochemical processes above a south-east Asian tropical rain forest (the OP3 project): introduction, rationale, location characteristics and tools

Hewitt, C. N.; Lee, J.; Barkley, M. P.; Carslaw, N.; Chappell, N. A.; Coe, H.; Collier, C.; Commane, R.; Davies, F.; Di Carlo, P.; Di Marco, C.; Edwards, P. M.; Evans, M. J.; Fowler, D.; Furneaux, K. L.; Gallagher, M.; Guenther, A.; Heard, D. E.; Helfter, C.; Hopkins, J.; Ingham, T.; Irwin, M.; Jones, C.; Karunaharan, A.; Langford, B.; Lewis, A.; Lim, S. F.; MacDonald, S. M.; MacKenzie, A. R.; Mahajan, A. S.; Malpass, S.; McFiggans, G.; Mills, G.; Misztal, P.; Moller, S.; Monks, P. S.; Nemitz, E.; Nicolas-Perea, V.; Oetjen, H.; Oram, D.; Palmer, P.I.; Phillips, G.; Plane, J. M. C.; Pugh, T.; Pyle, J. A.; Reeves, C. E.; Robinson, N. H.; Stewart, D.; Stone, D.; Whalley, L. K.. 2009 Oxidant and particle photochemical processes above a south-east Asian tropical rain forest (the OP3 project): introduction, rationale, location characteristics and tools. Atmospheric Chemistry and Physics Discussions, 9. 18899-18963.

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Abstract/Summary

In April–July 2008, intensive measurements were made of atmospheric composition and chemistry in Sabah, Malaysia, as part of the "Oxidant and particle photochemical processes above a South-East Asian tropical rain forest" (OP3) project. Fluxes and concentrations of trace gases and particles were made from and above the rain forest canopy at the Bukit Atur Global Atmosphere Watch station and at the nearby Sabahmas oil palm plantation, using both ground-based and airborne measurements. Here, the measurement and modelling strategies used, the characteristics of the sites and an overview of data obtained are described. Composition measurements show that the rainforest site was not impacted by significant sources of anthropogenic pollution, and this is confirmed by satellite retrievals of NO2 and HCHO. The dominant modulators of atmospheric chemistry at the rain forest site were therefore emissions of BVOCs and soil emissions of reactive nitrogen oxides. At the observed BVOC:NOx volume mixing ratio (~104 pptv/pptv), current chemical models suggest that daytime maximum OH concentrations should be ca. 105 radicals cm−3, but observed OH concentrations were an order of magnitude greater than this. We confirm, therefore, previous measurements which suggest that an unexplained source of OH must exist above tropical forests and continue to interrogate the data to find explanations for this.

Item Type: Publication - Article
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
CEH Sections: Billett
ISSN: 1680-7367
Additional Information. Not used in RCUK Gateway to Research.: Full text available from Official URL: http://www.atmos-chem-phys-discuss.net/9/18899/2009/acpd-9-18899-2009.pdf
NORA Subject Terms: Atmospheric Sciences
Date made live: 24 Feb 2010 15:33
URI: http://nora.nerc.ac.uk/id/eprint/8439

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