Chemical characterization of rosewood (<i>Aniba rosaeodora Ducke</i>) leaf essential oil by comprehensive two-dimensional gas chromatography coupled with quadrupole mass spectrometry

Fidelis, Carlos H.V.; Augusto, Fábio; Sampaio, Paulo de Tarso Barbosa; Krainovic, Pedro Medrado; Barata, Lauro Euclides Soares

doi:10.1080/10412905.2012.676770

Cited by 23 publications

(15 citation statements)

References 18 publications

(21 reference statements)

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“…In contrast, the monoterpenes, while also present in the essential oil of Amazonian trees (e.g. Fidelis et al, 2012;Lima et al, 2005), appear to be dominated by emissions that occur with no storage (e.g. Loreto et al, 1996;Jardine et al, 2015), similar to isoprene emission processes.…”

Section: Diurnal Variation Of Isoprenoid Mixing Ratiosmentioning

confidence: 98%

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Alves¹,

Jardine²,

Tóta³

et al. 2016

Atmos. Chem. Phys.

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Abstract. Tropical rainforests are an important source of isoprenoid and other volatile organic compound (VOC) emissions to the atmosphere. The seasonal variation of these compounds is however still poorly understood. In this study, vertical profiles of mixing ratios of isoprene, total monoterpenes and total sesquiterpenes, were measured within and above the canopy, in a primary rainforest in central Amazonia, using a proton transfer reaction -mass spectrometer (PTR-MS). Fluxes of these compounds from the canopy into the atmosphere were estimated from PTR-MS measurements by using an inverse Lagrangian transport model. Measurements were carried out continuously from September 2010 to January 2011, encompassing the dry and wet seasons. Mixing ratios were higher during the dry (isoprene -2.68 ± 0.9 ppbv, total monoterpenes -0.67 ± 0.3 ppbv; total sesquiterpenes -0.09 ± 0.07 ppbv) than the wet season (isoprene -1.66 ± 0.9 ppbv, total monoterpenes -0.47 ± 0.2 ppbv; total sesquiterpenes -0.03±0.02 ppbv) for all compounds. Ambient air temperature and photosynthetically active radiation (PAR) behaved similarly. Daytime isoprene and total monoterpene mixing ratios were highest within the canopy, rather than near the ground or above the canopy. By comparison, daytime total sesquiterpene mixing ratios were highest near the ground. Daytime fluxes varied significantly between seasons for all compounds. The maximums for isoprene (2.53 ± 0.5 µmol m −2 h −1 ) and total monoterpenes (1.77 ± 0.05 µmol m −2 h −1 ) were observed in the late dry season, whereas the maximum for total sesquiterpenes Published by Copernicus Publications on behalf of the European Geosciences Union. E. G. Alves et al.: Seasonality of isoprenoid emissions from a primary rainforest, Amazoniawas found during the dry-to-wet transition season (0.77 ± 0.1 µmol m −2 h −1 ). These flux estimates suggest that the canopy is the main source of isoprenoids emitted into the atmosphere for all seasons. However, uncertainties in turbulence parameterization near the ground could affect estimates of fluxes that come from the ground. Leaf phenology seemed to be an important driver of seasonal variation of isoprenoid emissions. Although remote sensing observations of changes in leaf area index were used to estimate leaf phenology, MEGAN 2.1 did not fully capture the behavior of seasonal emissions observed in this study. This could be a result of very local effects on the observed emissions, but also suggest that other parameters need to be better determined in biogenic volatile organic compound (BVOC) models. Our results support established findings that seasonality of isoprenoids are driven by seasonal changes in light, temperature and leaf phenology. However, they suggest that leaf phenology and its role on isoprenoid production and emission from tropical plant species needs to be better understood in order to develop mechanistic explanations for seasonal variation in emissions. This also may reduce the uncertainties of model estimates associated with the responses to en...

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Section: Diurnal Variation Of Isoprenoid Mixing Ratiosmentioning

confidence: 98%

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Alves¹,

Jardine²,

Tóta³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…In contrast, the monoterpenes, while also present in Amazonian tree essential oil (e.g. Fidelis et al, 2012;Lima et al, 2005), appear to be dominated by emissions that occur with no storage (e.g. Loreto et al, 1996;Jardine et al, 2015), similar to isoprene emission processes.…”

Section: Diurnal Variation Of Isoprenoid Mixing Ratiosmentioning

confidence: 99%

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Alves¹,

Jardine²,

Tóta³

et al. 2015

Preprint

View full text Add to dashboard Cite

Tropical rainforests are an important source of isoprenoid and other volatile organic compound (VOC) emissions to the atmosphere. The seasonal variation of these compounds is however still poorly understood. In this study, vertical profiles of mixing ratios of isoprene, total monoterpenes and total sesquiterpenes, were measured within and above the canopy, in a primary rainforest in central Amazonia, using a proton transfer reaction – mass spectrometer (PTR-MS). Fluxes of these compounds from the canopy into the atmosphere were estimated from PTR-MS measurements by using an inverse Lagrangian transport model. Measurements were carried out continuously from September 2010 to January 2011, encompassing the dry and wet seasons. Mixing ratios were higher during the dry (isoprene – 2.68 ± 0.9 ppbv, total monoterpenes – 0.67 ± 0.3 ppbv; total sesquiterpenes – 0.09 ± 0.07 ppbv) than the wet season (isoprene – 1.66 ± 0.9 ppbv, total monoterpenes – 0.47 ± 0.2 ppbv; total sesquiterpenes – 0.03 ± 0.02 ppbv) for all compounds. Ambient air temperature and photosynthetically active radiation (PAR) behaved similarly. Daytime isoprene and total monoterpene mixing ratios were highest within the canopy, rather than near the ground or above the canopy. By comparison, daytime total sesquiterpene mixing ratios were highest near the ground. Daytime fluxes varied significantly between seasons for all compounds. The maximums for isoprene (2.53 ± 0.5 µmol m−2 h−1) and total monoterpenes (1.77 ± 0.05 µmol m−2 h−1) were observed in the late dry season, whereas the maximum for total sesquiterpenes was found during the dry-to-wet transition season (0.77 ± 0.1 µmol m−2 h−1). These flux estimates suggest that the canopy is the main source of isoprenoids emitted into the atmosphere for all seasons. However, uncertainties in turbulence parameterization near the ground could affect estimates of fluxes that come from the ground. Leaf phenology seemed to be an important driver of seasonal variation of isoprenoid emissions. Although remote sensing observations of changes in leaf area index were used to estimate leaf phenology, MEGAN 2.1 did not fully capture the behavior of seasonal emissions observed in this study. This could be a result of very local effects on the observed emissions, but also suggest that other parameters need to be better determined in biogenic volatile organic compound (BVOC) models. Our results support established findings that seasonality of isoprenoids are driven by seasonal changes in light, temperature and leaf phenology. However, they suggest that leaf phenology and its role on isoprenoid production and emission from tropical plant species needs to be better understood in order to develop mechanistic explanations for seasonal variation in emissions. This also may reduce the uncertainties of model estimates associated with the responses to environmental factors. Therefore, this study strongly encourages long-term measurements of isoprenoid emissions, environmental factors and leaf phenology from leaf to ecosystem scale, wi...

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“…Further, vapor-phase wall losses of the more semi-volatile and lower-volatility oxidation products such as these in environmental chambers may result in non-atmospherically relevant phase partitioning and underestimated product and SOA yields La et al, 2016;Loza et al, 2010;Matsunaga and Ziemann, 2010;McMurry and Grosjean, 1985;Ye et al, 2016;Yeh and Ziemann, 2014;Zhang et al, , 2015. (2) This estimate derives from the available analysis of three essential oil types derived from Amazonian tree species: copaiba essential oil (this study; F. Soares et al, 2013), rosewood essential oil (Fidelis et al, 2012), and andiroba essential oil (this study). While these essential oils typically comprise ∼ 30 sesquiterpenes, Courtois et al (2009) report 169 sesquiterpenes emitted by 55 species of tropical trees.…”

Section: Observation Of β-Caryophyllene Oxidation Productsmentioning

confidence: 99%

Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons

et al. 2018

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Abstract. Biogenic volatile organic compounds (BVOCs) from the Amazon forest region represent the largest source of organic carbon emissions to the atmosphere globally. These BVOC emissions dominantly consist of volatile and intermediate-volatility terpenoid compounds that undergo chemical transformations in the atmosphere to form oxygenated condensable gases and secondary organic aerosol (SOA). We collected quartz filter samples with 12 h time resolution and performed hourly in situ measurements with a semi-volatile thermal desorption aerosol gas chromatograph (SV-TAG) at a rural site ("T3") located to the west of the urban center of Manaus, Brazil as part of the Green Ocean Amazon (GoAmazon2014/5) field campaign to measure intermediate-volatility and semi-volatile BVOCs and their oxidation products during the wet and dry seasons. We speciated and quantified 30 sesquiterpenes and 4 diterpenes with mean concentrations in the range 0.01-6.04 ng m −3 (1-670 ppq v ). We estimate that sesquiterpenes contribute approximately 14 and 12 % to the total reactive loss of O 3 via reaction with isoprene or terpenes during the wet and dry seasons, respectively. This is reduced from ∼ 50-70 % for within-canopy reactive O 3 loss attributed to the ozonolysis of highly reactive sesquiterpenes (e.g., β-caryophyllene) that are reacted away before reaching our measurement site. We further identify a suite of their oxidation products in the gas and particle phases and explore their role in biogenic SOA formation in the central Amazon region. Synthesized authentic standards were also used to quantify gas-and particle-phase oxidation products derived from β-caryophyllene. Using tracer-based scaling methods for these products, we roughly estimate that sesquiterpene oxidation contributes at least 0.4-5 % (median 1 %) of total submicron OA mass. However, this is likely a low-end estimate, as evidence for additional unaccounted sesquiterpenes and their oxidation products clearly exists. By comparing our field data to laboratory-based sesquiterpene oxidation experiments we confirm that more than 40 additional observed compounds produced through sesquiterpene oxidation are present in Amazonian SOA, warranting further efforts towards more complete quantification.

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Chemical characterization of rosewood (Aniba rosaeodora Ducke) leaf essential oil by comprehensive two-dimensional gas chromatography coupled with quadrupole mass spectrometry

Cited by 23 publications

References 18 publications

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia

Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons

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