Evaluation of semi-static enclosure technique for rapid surveys of biogenic volatile organic compounds (BVOCs) emission measurements

Li, Lingyu; Xie, Shaodong; Gu, Dasa; Seco, Roger; Nagalingam, Sanjeevi; Yan, Dongyun

doi:10.1016/j.atmosenv.2019.05.029

Cited by 19 publications

(8 citation statements)

References 17 publications

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“…Other factors, such as genetic and geographic differences, leaf age, plant age, growth stage, physiological status of plants, seasonality, soil moisture and nutrient status, shading and microclimate, can also result in variations in emission rates (Harley et al, 1997;Loreto et al, 2009;Singh et al, 2011;Welter et al, 2012;Llusià et al, 2013). Moreover, the inconsistent measurement enclosure systems used in different studies may be an important factor that introduces substantial uncertainty for E s Niinemets et al, 2011;Li et al, 2019). Overall, the E s of isoprene from all the measured tree species measured by dynamic chambers are higher than those from static chambers except for A. auriculaeformis and F. macrocarpa (Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…The reported emission rates for isoprene and total MTs varied by up to several orders of magnitude. The reliability of static enclosure measurements is questionable in comparison with dynamic enclosure measurements (Niinemets et al, 2011;Li et al, 2019;Zeng et al, 2022). The laboratory control measurements for seedlings (Tsui et al, 2009;Leung et al, 2010), however, may not well-represent real-world emissions from mature trees under natural growing environments (Niinemets et al, 2011;Emmerson et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Emissions of isoprenoids from dominant tree species in subtropical China

Zeng¹,

Song²,

Mu³

et al. 2022

Front. For. Glob. Change

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Emission factors (Es) are among the major sources of uncertainty in regional or global emission estimates of biogenic volatile organic compounds (BVOCs). Tropical vegetation contributes approximately 70% of global BVOC emissions, yet in situ measurements of BVOC emissions from tropical tree species, especially naturally grown mature trees, are quite limited. In this study, BVOC emissions from twenty mature trees (15 evergreen broad-leaved and 5 evergreen needle-leaved) were measured using dynamic chambers, and the emitted BVOCs were collected using sorbent tubes and speciated with a thermal desorption-gas chromatography/mass spectrometry system (TD-GC/MS). Twenty BVOC compounds including, isoprene, 14 monoterpene (MT) species and 9 sesquiterpene (SQT) species were quantified to calculate their Es. The results showed that Eucalyptus urophylla had the largest Es of isoprene (26.47 ± 3.70 μg g–1 h–1) among all the measured trees, followed by Ficus hispida (20.74 ± 1.78 μg g–1 h–1), Syzygium hainanense (20.49 ± 1.36 μg g–1 h–1), Casuarina equisetifolia (18.70 ± 2.91 μg g–1 h–1), and Mangifera indica (11.71 ± 7.04 μg g–1 h–1). α-Pinene, β-pinene, and limonene were the most abundant MTs, of which the largest Es were observed for Magnolia denudata (8.33 ± 2.05 μg g–1 h–1), Castanopsis hystrix (5.29 ± 3.24 μg g–1 h–1), and Magnolia denudata (3.11 ± 1.07 μg g–1 h–1), respectively. The Es of SQTs for the measured trees were lower than 0.50 μg g–1 h–1 except for Magnolia denudata (1.10 ± 0.41 μg g–1 h–1). β-Caryophyllene was the most common SQT, with Magnolia denudata having the highest Es of 0.09 ± 0.03 μg g–1h–1. The localized Es for dominant tree species could be used to update BVOC emission factors for typical vegetation types and help improve BVOC emission estimates in typical subtropical regions and narrow their uncertainties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emissions of isoprenoids from dominant tree species in subtropical China

Zeng¹,

Song²,

Mu³

et al. 2022

Front. For. Glob. Change

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“…These will change the physiological state of plants and cause abnormal emissions . For this reason, static or semi-static enclosures are considered to be screening tools to verify emitters and non-emitters (Niinemets et al, 2011;Li et al, 2019). Unlike static enclosure, dynamic enclosure introduces circulating air and can reduce the differences in environmental parameters between the enclosure and the ambient to a great extent.…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of a semi-open dynamic chamber for measuring biogenic volatile organic compound (BVOC) emissions from plants

Zeng

Zhang

et al. 2022

Atmos. Meas. Tech.

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Abstract. With the accumulation of data about biogenic volatile organic compound (BVOC) emissions from plants based on branch-scale enclosure measurements worldwide, it is vital to assure that measurements are conducted using well-characterized dynamic chambers with good transfer efficiencies and less disturbance on natural growing microenvironments. In this study, a self-made cylindrical semi-open dynamic chamber with a Teflon-coated inner surface was characterized both in the lab with standard BVOC mixtures and in the field with typical broadleaf and coniferous trees. The lab simulation with a constant flow of standard mixtures and online monitoring of BVOCs by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) revealed lower real-time mixing ratios and shorter equilibrium times than theoretically predicted due to wall loss in the chamber and that larger flow rates (shorter residence times) can reduce the adsorptive loss and improve the transfer efficiencies. However, even when flow rates were raised to secure residence times of less than 1 min, transfer efficiencies were still below 70 % for heavier BVOCs like α-pinene and β-caryophyllene. Relative humidity (RH) impacted the adsorptive loss of BVOCs less significantly when compared to flow rates, with compound-specific patterns related to the influence of RH on their adsorption behaviour. When the chamber was applied in the field to a branch of a Mangifera indica tree, the ambient–enclosure temperature differences decreased from 4.5±0.3 to 1.0±0.2 ∘C and the RH differences decreased from 9.8 ± 0.5 % to 1.2±0.1 % as flow rates increased from 3 L min−1 (residence time ∼4.5 min) to 15 L min−1 (residence time ∼0.9 min). At a medium flow rate of 9 L min−1 (residence time ∼1.5 min), field tests with the dynamic chamber for Mangifera indica and Pinus massoniana branches revealed enclosure temperature increase within +2 ∘C and CO2 depletion within −50 ppm when compared to their ambient counterparts. The results suggested that substantially higher air circulating rates would benefit by reducing equilibrium time, adsorptive loss, and the ambient–enclosure temperature and RH differences. However, even under higher air circulating rates and with inert Teflon-coated inner surfaces, the transfer efficiencies for monoterpene and sesquiterpene species are not so satisfactory, implying that emission factors for these species might be underestimated if they are obtained by dynamic chambers without certified transfer efficiencies and that further efforts are needed for field measurements to improve accuracies and narrow the uncertainties of the emission factors.

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“…For this reason, static or semi-static enclosures are considered to be screening tools to verify emitters and non-emitters (Niinemets et al, 2011;Li et al, 2019). Unlike static enclosure, dynamic enclosure introduces circulating air and can reduce the differences in environmental parameters between the enclosure and the ambient to a great extent.…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of a semi-open dynamic chamber for measuring biogenic volatile organic compounds (BVOCs) emissions from plants

Zeng

Zhang

et al. 2021

Preprint

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Abstract. With the accumulation of data about biogenic volatile organic compounds (BVOCs) emissions from plants based on branch-scale enclosure measurements worldwide, it is vital to assure that measurements are conducted using well-characterized dynamic chambers with good transfer efficiencies and less disturbance on natural growing microenvironments. In this study, a self-made cylindrical semi-open dynamic chamber with Teflon-coated inner surface was characterized both in the lab with standard BVOC mixtures and in the field with typical broad-leaf and coniferous trees. The lab simulation with a constant flow of standard mixtures and online monitoring of BVOCs by proton transfer-time of flight-mass spectrometry (PTR-ToF-MS) revealed that lower real-time mixing ratios and shorter equilibrium times than theoretically predicted due to wall loss in the chamber, and larger flow rates (shorter residence times) can reduce the absorptive loss and improve the transfer efficiencies. However, even flow rates were raised to secure residence times less than 1 min, transfer efficiencies were still below 70 % for heavier BVOCs like α-pinene and β-caryophyllene. Relative humidity (RH) impacted the adsorptive loss of BVOCs less significantly when compared to flow rates, with compound specific patterns related to the influence of RH on their adsorption behavior. When the chamber was applied in the field to a branch of a mangifera indica tree, the enclosure-ambient temperature differences decreased from 4.5 ± 0.3 to 1.0 ± 0.2 °C and the RH differences decreased from 9.8 ± 0.5 % to 1.2 ± 0.1 % as flow rates increased from 3 L min−1 (residence time ~4.5 min) to 15 L min−1 (residence time ~0.9 min). At a medium flow rate of 9 L min−1 (residence time ~1.5 min), field tests with the dynamic chamber for Mangifera indica and Pinus massoniana branches revealed enclosure temperature increase within +2 °C and CO2 depletion within −50 ppm when compared to their ambient counterparts. The results suggested that substantially higher air circulating rates would benefit reducing equilibrium time, adsorptive loss and the ambient-enclosure temperature/RH differences. However, even under higher air circulating rates and with inert Teflon-coated inner surfaces, the transfer efficiencies for monoterpene and sesquiterpene species are not so satisfactory, implying that emission factors for these species might be underestimated if they are obtained by dynamic chambers without certified transfer efficiencies, and that further efforts are needed for field measurements to improve accuracies and narrow the uncertainties of the emission factors.

show abstract

Evaluation of semi-static enclosure technique for rapid surveys of biogenic volatile organic compounds (BVOCs) emission measurements

Cited by 19 publications

References 17 publications

Emissions of isoprenoids from dominant tree species in subtropical China

Emissions of isoprenoids from dominant tree species in subtropical China

Design and characterization of a semi-open dynamic chamber for measuring biogenic volatile organic compound (BVOC) emissions from plants

Design and characterization of a semi-open dynamic chamber for measuring biogenic volatile organic compounds (BVOCs) emissions from plants

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