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DOI	10.5194/acp-20-7179-2020
	PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest
	Sarkar C.; Guenther A.B.; Park J.-H.; Seco R.; Seco R.; Alves E.; Alves E.; Batalha S.; Santana R.; Kim S.; Smith J.; Tóta J.; Vega O.
发表日期	2020
ISSN	16807316
起始页码	7179
结束页码	7191
卷号	20 期号:12
英文摘要	Biogenic volatile organic compounds (BVOCs) are important components of the atmosphere due to their contribution to atmospheric chemistry and biogeochemical cycles. Tropical forests are the largest source of the dominant BVOC emissions (e.g. isoprene and monoterpenes). In this study, we report isoprene and total monoterpene flux measurements with a proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) using the eddy covariance (EC) method at the Tapajos National Forest (2.857 S, 54.959 W), a primary rainforest in eastern Amazonia. Measurements were carried out from 1 to 16 June 2014, during the wet-to-dry transition season. During the measurement period, the measured daytime (06:00- 18:00 LT) average isoprene mixing ratios and fluxes were 1:15-0:60 ppb and 0:55-0:71 mgCm-2 h-1, respectively, whereas the measured daytime average total monoterpene mixing ratios and fluxes were 0:14-0:10 ppb and 0:20- 0:25 mgCm-2 h-1, respectively. Midday (10:00-14:00 LT) average isoprene and total monoterpene mixing ratios were 1:70-0:49 and 0:24-0:05 ppb, respectively, whereas midday average isoprene and monoterpene fluxes were 1:24- 0:68 and 0:46-0:22 mgCm-2 h-1, respectively. Isoprene and total monoterpene emissions in Tapajos were correlated with ambient temperature and solar radiation. Significant correlation with sensible heat flux, SHF (r2 D 0:77), was also observed. Measured isoprene and monoterpene fluxes were strongly correlated with each other (r2 D 0:93). The MEGAN2.1 (Model of Emissions of Gases and Aerosols from Nature version 2.1) model could simulate most of the observed diurnal variations (r2 D 0:7 to 0.8) but declined a little later in the evening for both isoprene and total monoterpene fluxes. The results also demonstrate the importance of site-specific vegetation emission factors (EFs) for accurately simulating BVOC fluxes in regional and global BVOC emission models. © 2020 BMJ Publishing Group. All rights reserved.
关键词	atmospheric chemistry biogenic emission biogeochemical cycle isoprene mixing ratio monoterpene rainforest tropical forest volatile organic compound Amazonia Brazil Para [Brazil]Tapajos National Forest
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131968
推荐引用方式 GB/T 7714	Sarkar C.,Guenther A.B.,Park J.-H.,et al. PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest[J]. Atmospheric Chemistry and Physics,2020,20(12).
APA	Sarkar C..,Guenther A.B..,Park J.-H..,Seco R..,Seco R..,...&Vega O..(2020).PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest.,20(12).
MLA	Sarkar C.,et al."PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest".20.12(2020).