In situ measurements of isoprene and monoterpenes within a south-east Asian tropical rainforest

Jones, C. E.; Hopkins, James R.; Lewis, Alastair C.

doi:10.5194/acp-11-6971-2011

Cited by 43 publications

(40 citation statements)

References 34 publications

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“…Due to observed inter-conversion between MT isomers inside the instrument presumably during 15 the pre-concentration step in the thermal desorption unit, only MT sum is reported. Similar behavior has been observed by Jones et al (2011). However, contrary to their observations we did not find isomerization to be repeatable.…”

Section: Voc Measurementscontrasting

confidence: 56%

“…However, PTR-MS is not able to separate different MTs or SQTs. Data on concentrations of individual MTs measured by gas chromatographmass spectrometers (GC-MSs) are scarce and often only from short measurement campaigns (Yanez-Serrano et al 2017, Jardine et al 2015, Jones et al 2011, Hakola et al 2009and 2003, Kesselmeier et al 2002. Emissions of both MTs and SQTs have been studied at various vegetation zones (Guenther et al 2012), but to our knowledge there are only three studies 30 published on atmospheric concentrations of individual SQTs (Bouvier-Brown et al 2009and Yee et al 2018.…”

Section: Introductionmentioning

confidence: 99%

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Sesquiterpenes identified as key species for atmospheric chemistry in boreal forest by terpenoid and OVOC measurements

Hellén

Praplan

Tykkä

et al. 2018

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Abstract. Concentrations of terpenoids (isoprene, monoterpenes, sesquiterpenes) and oxygenated volatile organic compounds (OVOCs, i.e. aldehydes, alcohols, acetates and volatile organic acids) were investigated during two years at a boreal forest site in Hyytiälä, Finland, using in situ gas chromatograph-mass spectrometers (GC-MS). Seasonal and diurnal variations of terpenoid and OVOC concentrations as well as their relationship with meteorological factors were studied.Of the studied VOCs, C2-C7 unbranched volatile organic acids (VOAs) were found to have the highest concentrations mainly 20 due to their low reactivity. Of the terpenoids, monoterpenes (MTs) had highest concentrations at the site, but also 7 different highly reactive sesquiterpenes (SQTs) were detected. Monthly and daily mean concentrations of most terpenoids, aldehydes and VOAs were found to be highly dependent on the temperature. Highest exponential correlation with temperature was found for a SQT (β-caryophyllene) in summer. The diurnal variations of the concentrations could be explained by sources, sinks and vertical mixing. Especially the diurnal variations of MT concentrations were strongly affected by vertical mixing. Based on 25 the temperature correlations and mixing layer height simple proxies were developed for estimating MT and SQT concentrations.To estimate the importance of different compound groups and compounds for the local atmospheric chemistry, reactivity with main oxidants (OH, NO3 and O3) and production rates of oxidation products (OxPR) were calculated. MTs dominated OH and NO3 radical chemistry, but SQTs had a major impact on ozone chemistry, even though concentrations of SQT were 30 times 30 lower than MT concentrations. SQTs were the most important also for the production of oxidation products. Since SQTs have high secondary organic aerosol (SOA) yields, results clearly indicate the importance of SQTs for local SOA production.Atmos. Chem. Phys. Discuss., https://doi

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Section: Voc Measurementscontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Sesquiterpenes identified as key species for atmospheric chemistry in boreal forest by terpenoid and OVOC measurements

Hellén

Praplan

Tykkä

et al. 2018

Preprint

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“…This is situated within a region that was selectively timber harvested in 1988 (Tangki and Chappell, 2008) and is around 5 km from the protected forest area known as the Danum Valley Conservation Area (DVCA). Measurements of BVOCs taken as part of the OP3 project indicated that the dominant BVOC species observed was isoprene, with an average ground level mixing ratio of around 1 ppb and a maximum value of 2.5 ppb (Jones et al, 2011). Speciated monoterpene mixing ratios were also measured at this location for the first time and indicated a monoterpene to isoprene ratio of around 0.3 (ppb ppb −1 ) during the day and 2.0 at night.…”

Section: Introductionmentioning

confidence: 83%

Linking biogenic hydrocarbons to biogenic aerosol in the Borneo rainforest

et al. 2013

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Abstract. Emissions of biogenic volatile organic compounds are though to contribute significantly to secondary organic aerosol formation in the tropics, but understanding these transformation processes has proved difficult, due to the complexity of the chemistry involved and very low concentrations. Aerosols from above a Southeast Asian tropical rainforest in Borneo were characterised using liquid chromatography-ion trap mass spectrometry, high-resolution aerosol mass spectrometry and Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) techniques. Oxygenated compounds were identified in ambient organic aerosol that could be directly traced back to isoprene, monoterpenes and sesquiterpene emissions, by combining field data on chemical structures with mass spectral data generated from synthetically produced products created in a simulation chamber. Eighteen oxygenated species of biogenic origin were identified in the rainforest aerosol from the precursors isoprene, α-pinene, limonene, α-terpinene and β-caryophyllene. The observations provide the unambiguous field detection of monoterpene and sesquiterpene oxidation products in SOA above a pristine tropical rainforest. The presence of 2-methyl tetrol organosulfates and an associated sulfated dimer provides direct evidence that isoprene in the presence of sulfate aerosol can make a contribution to biogenic organic aerosol above tropical forests. High-resolution mass spectrometry indicates that sulfur can also be incorporated into oxidation products arising from monoterpene precursors in tropical aerosol.

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“…Established measurement techniques for in situ BVOC monitoring typically offer a trade-off between sample frequency and speciation. Detailed information regarding chemical composition may be obtained via conventional gas chromatography methods (GC-FID and GC-MS) which can quantify individual terpene isomers, but with a limited sample frequency (typically one 10-30 min averaged sample, every ∼ 50-60 min -e.g Bouvier-Brown et al, 2009;Jones et al, 2011;Hopkins et al, 2011). In contrast, near real-time terpene observations may be obtained by proton transfer reaction (PTR) mass spectrometry techniques (e.g.…”

Section: E Jones Et Al: a Novel Fast Gas Chromatography Methods Fmentioning

confidence: 99%

A novel fast gas chromatography method for higher time resolution measurements of speciated monoterpenes in air

et al. 2014

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Abstract. Biogenic emissions supply the largest fraction of non-methane volatile organic compounds (VOC) from the biosphere to the atmospheric boundary layer, and typically comprise a complex mixture of reactive terpenes. Due to this chemical complexity, achieving comprehensive measurements of biogenic VOC (BVOC) in air within a satisfactory time resolution is analytically challenging. To address this, we have developed a novel, fully automated Fast Gas Chromatography (Fast-GC) based technique to provide higher time resolution monitoring of monoterpenes (and selected other C 9 -C 15 terpenes) during plant emission studies and in ambient air. To our knowledge, this is the first study to apply a Fast-GC based separation technique to achieve quantification of terpenes in ambient air. Three chromatography methods have been developed for atmospheric terpene analysis under different sampling scenarios. Each method facilitates chromatographic separation of selected BVOC within a significantly reduced analysis time compared to conventional GC methods, whilst maintaining the ability to quantify individual monoterpene structural isomers. Using this approach, the C 9 -C 15 BVOC composition of single plant emissions may be characterised within a 14.5 min analysis time. Moreover, in-situ quantification of 12 monoterpenes in unpolluted ambient air may be achieved within an 11.7 min chromatographic separation time (increasing to 19.7 min when simultaneous quantification of multiple oxygenated C 9 -C 10 terpenoids is required, and/or when concentrations of anthropogenic VOC are significant). These analysis times potentially allow for a twofold to fivefold increase in measurement frequency compared to conventional GC methods. Here we outline the technical details and analytical capability of this chromatographic approach, and present the first in-situ Fast-GC observations of 6 monoterpenes and the oxygenated BVOC (OBVOC) linalool in ambient air. During this field deployment within a suburban forest ∼ 30 km west of central Tokyo, Japan, the Fast-GC limit of detection with respect to monoterpenes was 4-5 ppt, and the agreement between Fast-GC and PTR-MS derived total monoterpene mixing ratios was consistent with previous GC/PTR-MS comparisons. The measurement uncertainties associated with the Fast-GC quantification of monoterpenes are ≤ 12 %, while larger uncertainties (up to ∼ 25 %) are associated with the OBVOC and sesquiterpene measurements.

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In situ measurements of isoprene and monoterpenes within a south-east Asian tropical rainforest

Cited by 43 publications

References 34 publications

Sesquiterpenes identified as key species for atmospheric chemistry in boreal forest by terpenoid and OVOC measurements

Sesquiterpenes identified as key species for atmospheric chemistry in boreal forest by terpenoid and OVOC measurements

Linking biogenic hydrocarbons to biogenic aerosol in the Borneo rainforest

A novel fast gas chromatography method for higher time resolution measurements of speciated monoterpenes in air

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