Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical ra
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 ra. Atmospheric Chemistry and Physics, 10. 8391-8412. 10.5194/acp-10-8391-2010
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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. There was no evidence for nocturnal monoterpene emissions 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 0.46mg m−2 h−1 respectively, which was 4 and 1.8 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.net/10/8391/2010/acp-10-8391-2010.html ]
|Programmes:||CEH Topics & Objectives 2009 onwards > 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 onwards > 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 ...
|Additional Information:||Atmospheric Chemistry and Physics is an Open Access journal. Follow OFFICIAL URL link to access the full text.|
|NORA Subject Terms:||Atmospheric Sciences|
|Date made live:||01 Mar 2011 16:17|
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Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest. (deposited 01 Jul 2010 10:59)
- Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical ra. (deposited 01 Mar 2011 16:17) [Currently Displayed]
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