Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools
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...
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| Format: | Article |
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Copernicus Publications
2010-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/10/169/2010/acp-10-169-2010.pdf |
| _version_ | 1819053585334272000 |
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| author | 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. 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 |
| author_facet | 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. 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 |
| author_sort | C. N. Hewitt |
| collection | DOAJ |
| description | 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<sub>2</sub> 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<sub>x</sub> volume mixing ratio (~100 pptv/pptv), current chemical models suggest that daytime maximum OH concentrations should be ca. 10<sup>5</sup> radicals cm<sup>&minus;3</sup>, 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. |
| first_indexed | 2024-12-21T12:38:04Z |
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| id | doaj.art-0575afa4ab5d43498785eaf484e56059 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-21T12:38:04Z |
| publishDate | 2010-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-0575afa4ab5d43498785eaf484e560592022-12-21T19:03:51ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242010-01-01101169199Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and toolsC. N. HewittJ. D. LeeA. R. MacKenzieM. P. BarkleyN. CarslawG. D. CarverN. A. ChappellH. CoeC. CollierR. CommaneF. DaviesB. DavisonP. DiCarloC. F. Di MarcoJ. R. DorseyP. M. EdwardsM. J. EvansD. FowlerK. L. FurneauxM. GallagherA. GuentherD. E. HeardC. HelfterJ. HopkinsT. InghamM. IrwinC. JonesA. KarunaharanB. LangfordA. C. LewisS. F. LimS. M. MacDonaldA. S. MahajanS. MalpassG. McFiggansG. MillsP. MisztalS. MollerP. S. MonksE. NemitzV. Nicolas-PereaH. OetjenD. E. OramP. I. PalmerG. J. PhillipsR. PikeJ. M. C. PlaneT. PughJ. A. PyleC. E. ReevesN. H. RobinsonD. StewartD. StoneL. K. WhalleyX. YinIn 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<sub>2</sub> 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<sub>x</sub> volume mixing ratio (~100 pptv/pptv), current chemical models suggest that daytime maximum OH concentrations should be ca. 10<sup>5</sup> radicals cm<sup>&minus;3</sup>, 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.http://www.atmos-chem-phys.net/10/169/2010/acp-10-169-2010.pdf |
| spellingShingle | 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. 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 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 |
| title | Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| title_full | Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| title_fullStr | Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| title_full_unstemmed | Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| title_short | Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools |
| title_sort | overview oxidant and particle photochemical processes above a south east asian tropical rainforest the op3 project introduction rationale location characteristics and tools |
| url | http://www.atmos-chem-phys.net/10/169/2010/acp-10-169-2010.pdf |
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