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

Misztal, P. K. and Nemitz, E. and Langford, B. and Di Marco, C. F. and Phillips, G. J. and Hewitt, C. N. and Mackenzie, Rob and Owen, S. M. and Fowler, D. and Heal, M. R. and Cape, J. N. (2011) Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia. Atmospheric Chemistry and Physics, 11 (17). pp. 8995-9017. ISSN 1680-7316

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Abstract

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: Article
Journal or Publication Title: Atmospheric Chemistry and Physics
Uncontrolled Keywords: TROPICAL RAIN-FOREST ; REACTION-MASS-SPECTROMETRY ; MIMETIC ATTRACTANTS EXCITANTS ; EDDY COVARIANCE MEASUREMENTS ; PTR-MS ; ISOPRENE EMISSIONS ; DETECTION LIMIT ; ATMOSPHERIC CHEMISTRY ; BIOGENIC EMISSIONS ; OXIDATION-PRODUCTS
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 51524
Deposited By: ep_importer_pure
Deposited On: 24 Nov 2011 14:52
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2013 23:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51524

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