Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools

Hewitt, CN, Lee, JD, MacKenzie, AR, Barkley, MP, Carslaw, N, Carver, GD, Chappell, NA, Coe, H, Collier, C, Commane, R, Davies, F, Davison, B, DiCarlo, P, Di Marco, CF, Dorsey, JR, Edwards, PM, Evans, MJ, Fowler, D, Furneaux, KL, Gallagher, M, Guenther, A, Heard, DE, Helfter, C, Hopkins, J, Ingham, T, Irwin, M, Jones, C, Karunaharan, A, Langford, B, Lewis, AC, Lim, SF, MacDonald, SM, Mahajan, AS, Malpass, S, McFiggans, G, Mills, G, Misztal, P, Moller, S, Monks, PS, Nemitz, E, Nicolas-Perea, V, Oetjen, H, Oram, DE, Palmer, PI, Phillips, GJ, Pike, R, Plane, JMC, Pugh, T, Pyle, JA, Reeves, CE ORCID: https://orcid.org/0000-0003-4071-1926, Robinson, NH, Stewart, D, Stone, D, Whalley, LK and Yin, X (2010) Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools. Atmospheric Chemistry and Physics, 10 (1). pp. 169-199. ISSN 1680-7324

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Abstract

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 rainforest" (OP3) project. Fluxes and concentrations of trace gases and particles were made from and above the rainforest 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 significantly impacted by anthropogenic pollution, and this is confirmed by satellite retrievals of NO2 and HCHO. The dominant modulators of atmospheric chemistry at the rainforest site were therefore emissions of BVOCs and soil emissions of reactive nitrogen oxides. At the observed BVOC:NOx volume mixing ratio (~100 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 that suggest that an unexplained source of OH must exist above tropical rainforest and we continue to interrogate the data to find explanations for this.

Item Type: Article
Additional Information: A corrigendum is available for this article.
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Users 2731 not found.
Date Deposited: 28 Feb 2012 12:30
Last Modified: 18 Sep 2022 01:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/37554
DOI: 10.5194/acp-10-169-2010

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