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Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest

Langford, B.; Misztal, P.K.; Nemitz, E.; Davison, B.; Helfter, C.; Pugh, T.A.M.; MacKenzie, A.R.; Lim, S.F.; Hewitt, C.N.. 2010 Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest. Atmospheric Chemistry and Physics Discussions, 10 (5). 11975-12021. 10.5194/acpd-10-11975-2010

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Abstract/Summary

As part of the OP3 field study of rainforest atmospheric chemistry, above-canopy fluxes of isoprene, monoterpenes and oxygenated volatile organic compounds were made by virtual disjunct eddy covariance from a South-East Asian tropical rainforest in Malaysia. Approximately 500 hours of flux data were collected over 48 days in April–May and June–July 2008. Isoprene was the dominant non-methane hydrocarbon emitted from the forest, accounting for 80% (as carbon) of the measured emission of reactive carbon fluxes. Total monoterpene emissions accounted for 18% of the measured reactive carbon flux. Monoterpenes were not emitted at night, and during the day their flux rate was dependent on both light and temperature. The oxygenated compounds, including methanol, acetone and acetaldehyde, contributed less than 2% of the total measured reactive carbon flux. The sum of the VOC fluxes measured represents a 0.4% loss of daytime assimilated carbon by the canopy, but atmospheric chemistry box modelling suggests that most (90%) of this reactive carbon is returned back to the canopy by wet and dry deposition following chemical transformation. The emission rates of isoprene and monoterpenes, normalised to 30 °C and 1000 μmol m−2 s−1 PAR, were 1.6 mg m−2 h−1 and 0.46 mg m−2 h−1 respectively, which was 4 and 1.7 times lower respectively than the default value for tropical forests in the widely-used MEGAN model of biogenic VOC emissions. This highlights the need for more direct canopy-scale flux measurements of VOCs from the world's tropical forests. [Abstract from: http://www.atmos-chem-phys-discuss.net/10/11975/2010/acpd-10-11975-2010.html ]

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acpd-10-11975-2010
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 1680-7367
Additional Information. Not used in RCUK Gateway to Research.: Atmospheric Chemistry and Physics Discussions is an Open Access journal. Follow OFFICIAL URL link to access the full text.
NORA Subject Terms: Atmospheric Sciences
Date made live: 01 Jul 2010 10:59
URI: http://nora.nerc.ac.uk/id/eprint/10045

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