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Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia

Misztal, P.K.; Nemitz, E.; Langford, B.; Di Marco, C.F.; Phillips, G.J.; Hewitt, C.N.; MacKenzie, A.R.; Owen, S.M.; Fowler, D.; Heal, M.R.; Cape, J.N.. 2011 Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia. Atmospheric Chemistry and Physics, 11 (17). 8995-9017. 10.5194/acp-11-8995-2011

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Abstract/Summary

This paper reports the first direct eddy covariance fluxes of reactive biogenic volatile organic compounds (BVOCs) from oil palms to the atmosphere using proton-transfer-reaction mass spectrometry (PTR-MS), measured at a plantation in Malaysian Borneo. At midday, net isoprene flux constituted the largest fraction (84 %) of all emitted BVOCs measured, at up to 30 mg m−2 h−1 over 12 days. By contrast, the sum of its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) exhibited clear deposition of 1 mg m−2 h−1, with a small average canopy resistance of 230 s m−1. Approximately 15 % of the resolved BVOC flux from oil palm trees could be attributed to floral emissions, which are thought to be the largest reported biogenic source of estragole and possibly also toluene. Although on average the midday volume mixing ratio of estragole exceeded that of toluene by almost a factor of two, the corresponding fluxes of these two compounds were nearly the same, amounting to 0.81 and 0.76 mg m−2 h−1, respectively. By fitting the canopy temperature and PAR response of the MEGAN emissions algorithm for isoprene and other emitted BVOCs a basal emission rate of isoprene of 7.8 mg m−2 h−1 was derived. We parameterise fluxes of depositing compounds using a resistance approach using direct canopy measurements of deposition. Consistent with Karl et al. (2010), we also propose that it is important to include deposition in flux models, especially for secondary oxidation products, in order to improve flux predictions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acp-11-8995-2011
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.4 - Develop innovative, effective methods for monitoring fluxes, exposure and effects
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 30 Nov 2013)
ISSN: 1680-7316
Additional Information. Not used in RCUK Gateway to Research.: Open Access article - click on the Official URL link for full text
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 02 Sep 2011 15:58
URI: http://nora.nerc.ac.uk/id/eprint/15034

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