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

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, P Di Carlo, C F Di 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 show all authors
ATMOSPHERIC CHEMISTRY AND PHYSICS ()
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Abstract

In April-July 2008, intensive measurements were made of atmospheric\ncomposition and chemistry in Sabah, Malaysia, as part of the ``Oxidant\nand particle photochemical processes above a South-East Asian tropical\nrainforest{''} (OP3) project. Fluxes and concentrations of trace gases\nand particles were made from and above the rainforest canopy at the\nBukit Atur Global Atmosphere Watch station and at the nearby Sabahmas\noil palm plantation, using both ground-based and airborne measurements.\nHere, the measurement and modelling strategies used, the characteristics\nof the sites and an overview of data obtained are described. Composition\nmeasurements show that the rainforest site was not significantly\nimpacted by anthropogenic pollution, and this is confirmed by satellite\nretrievals of NO2 and HCHO. The dominant modulators of atmospheric\nchemistry at the rainforest site were therefore emissions of BVOCs and\nsoil emissions of reactive nitrogen oxides. At the observed BVOC:NOx\nvolume mixing ratio (similar to 100 pptv/pptv), current chemical models\nsuggest that daytime maximum OH concentrations should be ca. 10(5)\nradicals cm(-3), but observed OH concentrations were an order of\nmagnitude greater than this. We confirm, therefore, previous\nmeasurements that suggest that an unexplained source of OH must exist\nabove tropical rainforest and we continue to interrogate the data to\nfind explanations for this.

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Authors on Mendeley

  1. Glenn Carver
    Researcher (at an Academic Institution)
    European Centre for Medium-Range Weather Forecast (ECMWF)
  2. James Dorsey
    Researcher (at an Academic Institution)
    Centre for Atmospheric Science, University of Manchester

Readership Statistics

46 Readers on Mendeley
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41% Earth and Planetary Sciences
 
37% Environmental Science
 
17% Chemistry
by Academic Status
 
46% Researcher
 
22% Student > Ph. D. Student
 
13% Professor > Associate Professor
by Country
 
15% United Kingdom
 
4% Brazil
 
4% United States

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