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| Titel |
Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| VerfasserIn |
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, P. DiCarlo, C. F. Marco, 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. Yin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-12), S.169-199 |
| Datensatznummer |
250007899
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| Publikation (Nr.) |
 copernicus.org/acp-10-169-2010.pdf |
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| Zusammenfassung |
| 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. |
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