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

journal contribution
posted on 24.10.2012, 09:06 by C.N. Hewitt, J.D. Lee, A.R. MacKenzie, M.P. Barkley, N. Carslaw, G.D. Carver, N.A. Chappell, H. Coe, C. Collier, R. Commane, F. Davies, B. Davison, DiCarlo P., Di Marco C.F., J.R. Dorsey, P.M. Edwards, M.J. Evans, D. Fowler, K.L. Furneaux, M. Gallagher, A. Guenther, D.E. Heard, C. Helfter, J. Hopkins, T. Ingham, M. Irwin, C. Jones, A. Karunaharan, B. Langford, A.C. Lewis, S.F. Lim, S.M. MacDonald, A.S. Mahajan, S. Malpass, G. McFiggans, G. Mills, P. Misztal, S. Moller, P.S. Monks, E. Nemitz, V. Nicolas-Perea, H. Oetjen, D.E. Oram, P.I. Palmer, G.J. Phillips, R. Pike, J.M.C. Plane, T. Pugh, J.A. Pyle, C.E. Reeves, N.H. Robinson, D. Stewart, D. Stone, L.K. Whalley, X. Yang
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 NO[subscript 2] 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:NO[subscript x] volume mixing ratio (~100 pptv/pptv), current chemical models suggest that daytime maximum OH concentrations should be ca. 10[superscript 5] radicals cm[superscript −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.

History

Citation

Atmospheric Chemistry and Physics, 2010, 10 (1), pp. 169-199

Version

VoR (Version of Record)

Published in

Atmospheric Chemistry and Physics

Publisher

Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU).

issn

1680-7316

eissn

1680-7324

Copyright date

2010

Available date

24/10/2012

Publisher version

http://www.atmos-chem-phys.net/10/169/2010/acp-10-169-2010.html

Notes

Corrigendum to “Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools” published in Atmos. Chem. Phys., 10, 169–199, 2010. doi:10.5194/acp-10-563-2010 http://www.atmos-chem-phys.net/10/563/2010/acp-10-563-2010.html

Language

English