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

التفاصيل البيبلوغرافية
العنوان: Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia
المؤلفون: P. K. Misztal, E. Nemitz, B. Langford, C. F. Di Marco, G. J. Phillips, C. N. Hewitt, A. R. MacKenzie, S. M. Owen, D. Fowler, M. R. Heal, J. N. Cape
المصدر: Atmospheric Chemistry and Physics, Vol 11, Iss 17, Pp 8995-9017 (2011)
بيانات النشر: Copernicus Publications, 2011.
سنة النشر: 2011
المجموعة: LCC:Physics
LCC:Chemistry
مصطلحات موضوعية: Physics, QC1-999, Chemistry, QD1-999
الوصف: 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.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1680-7316
1680-7324
Relation: http://www.atmos-chem-phys.net/11/8995/2011/acp-11-8995-2011.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324
DOI: 10.5194/acp-11-8995-2011
URL الوصول: https://doaj.org/article/e0f002189d9245048ff0c47244c7470d
رقم الأكسشن: edsdoj.0f002189d9245048ff0c47244c7470d
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:16807316
16807324
DOI:10.5194/acp-11-8995-2011