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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. LU ; MacKenzie, A. R. ; Lim, S. F. and Hewitt, C. N. (2010) In Atmospheric Chemistry and Physics 10(17). p.8391-8412
Abstract

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... (More)

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-1and 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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
10
issue
17
pages
22 pages
publisher
Copernicus GmbH
external identifiers
  • scopus:77956431824
ISSN
1680-7316
DOI
10.5194/acp-10-8391-2010
language
English
LU publication?
no
id
3a876e55-e716-4d2c-a8d7-38103141dea0
date added to LUP
2020-11-19 23:32:05
date last changed
2022-04-19 02:19:22
@article{3a876e55-e716-4d2c-a8d7-38103141dea0,
  abstract     = {{<p>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 &amp;deg;C and 1000 μmol m<sup>-2</sup> s<sup>-1</sup> PAR, were 1.6 mg m<sup>-2</sup> h<sup>-1</sup>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.</p>}},
  author       = {{Langford, B. and Misztal, P. K. and Nemitz, E. and Davison, B. and Helfter, C. and Pugh, T. A.M. and MacKenzie, A. R. and Lim, S. F. and Hewitt, C. N.}},
  issn         = {{1680-7316}},
  language     = {{eng}},
  number       = {{17}},
  pages        = {{8391--8412}},
  publisher    = {{Copernicus GmbH}},
  series       = {{Atmospheric Chemistry and Physics}},
  title        = {{Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest}},
  url          = {{http://dx.doi.org/10.5194/acp-10-8391-2010}},
  doi          = {{10.5194/acp-10-8391-2010}},
  volume       = {{10}},
  year         = {{2010}},
}