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• W3156994828 abstract "Abstract Background: Biogenic Volatile Organic Compounds (BVOCs) such as isoprene (C 5 H 8 ) are ozone (O 3 ) precursors that can be emitted at significant concentrations from the oil palm tree ( Elaeis guineensis ). Reactions involving BVOCs can lead to increased levels of surface O 3 which can significantly impair air quality and cause crop damage. This study focuses on the link between isoprene, surface O 3 and carbon dioxide (CO 2 ) over an oil palm plantation and the effects of meteorological factors such as temperature and irradiance on the gas concentrations. The mixing ratios of isoprene, surface O 3 and CO 2 were measured using a portable gas chromatograph with a photoionization detector called ‘ iDirac ’, an EcoTech O 3 analyser, and LI-COR, respectively. Atmospheric models were used for measured selected gases estimation and validation purposes. Results: Results showed that isoprene and surface O 3 had maximum daytime mixing ratios of ~25 ppb and ~57 ppb, respectively. CO 2 mixing ratios were high during the night compared to the day, with a maximum night-time ratio of ~883 ppm. It is also showed that suppression of isoprene emissions from plants by high CO 2 concentrations during the night was due to the reduction of dimethylallyl diphosphate (DMADP) in the leaf cells. The meteorological parameters temperature and light intensity were significantly correlated with isoprene and surface O 3 , with r 2 =0.91 and p<0.01 and r 2 =0.87 and p<0.01, respectively. The Model of Emissions of Gases and Aerosol from Nature (MEGAN) estimated emission rates of isoprene from the oil palm plantation are in the range ~5000 to ~7000 μgm -2 h -1 which are higher than previous studies on pristine forest. This information together with the the in-situ measurement information on isoprene emission flux is then fed into the WRF-CMAQ atmospheric chemistry model to study the effect of oil palm plantation expansion over the years (2000 – 2016) on the local atmospheric chemistry. Conclusions: The in-situ of isoprene measurement in oil palm plantation has provided the variations of atmospheric concentration at different time scale which is important in giving information of surface O 3 production. The relationship between isoprene-surface O 3 and CO 2 -isoprene were interconnected at different time and influenced by meteorological factors. The model has discovered regions that are converted into oil palm plantation has experienced rise in isoprene concentration in region that are converted into oil palm plantation, and it even can be carried downwind up to 100 km inland of the emission source." @default.
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• W3156994828 date "2020-08-27" @default.
• W3156994828 modified "2023-10-05" @default.
• W3156994828 title "Driving Factors for Isoprene-Surface Ozone and Carbon Dioxide Chemistry Over an Oil Palm plantation in Malaysia" @default.
• W3156994828 doi "https://doi.org/10.21203/rs.3.rs-56420/v1" @default.
• W3156994828 hasPublicationYear "2020" @default.
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