Monoterpene fluxes measured above a Japanese red pine forest at Oshiba plateau, Japan

Tani, Atsushi; Nozoe, Susumu; Aoki, Marcelo Saldanha; Hewitt, C. Nicholas

doi:10.1016/s1352-2310(02)00313-8

Cited by 46 publications

(27 citation statements)

References 24 publications

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“…To investigate the impact of BVOCs on air quality and pollution, atmospheric BVOCs have been one of the most discussed topics in atmospheric chemistry in recent decades. Contributions of BVOCs to photochemical oxidants (Papiez et al, 2009) and SOAs (Henze and Seinfeld, 2006), observations and estimation of emission factors of BVOCs such as isoprene and monoterpenes (Guenther et al, 1995(Guenther et al, , 1996Tani et al, 2002;Guenther et al, 2006), and laboratory experiments to establish the mechanisms of SOA formation from BVOCs (Claeys et al, 2004;Perraud et al, 2010;Surratt et al, 2010) have all been investigated.…”

Section: Introductionmentioning

confidence: 99%

Measuring Biogenic Volatile Organic Compounds (BVOCs) from Vegetation in Terms of Ozone Reactivity

Matsumoto

2014

Aerosol Air Qual. Res.

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A new system that uses the total reactivity with ozone (R O3 ) was developed for measuring biogenic volatile organic compounds (BVOCs) emitted from vegetation into the atmosphere. The decrease in ozone caused by the reaction with VOCs was monitored at the ppbv level by dual chemiluminescence detectors (CLDs) based on the NO-O 3 reaction. Ozone was monitored by the dual CLDs before and after the reactor to correct for fluctuations in the ozone concentration. Such dual detectors can remove the interference caused by water vapor. A glass double-tube was adopted as the reactor. The loss rate of ozone to the wall was typically (6 ± 3) × 10 -4 s -1 . Gaseous cyclohexane was also added to the sample before it was introduced into the reactor to scavenge secondary OH radicals. From the characterization of the R O3 analyzer using the standard VOC sample, the dependence of ozone reduction on the reaction time and reactivity were shown to agree with theoretical predictions. A calibration procedure for determining the reaction time was also established. Consequently, the detection limit for R O3 in a 57-s reaction was determined to be 1.4 × 10 -4 s -1 (S/N = 3), which corresponded to 27 ppbv of limonene. It was confirmed that the R O3 analyzer was capable of measuring BVOC levels. Finally, a practical trial was conducted in which BVOCs emitted from a real needle-leaf tree were monitored. BVOC emissions from the tree were detected and a significant increase in R O3 was observed when the tree was irradiated with light.

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Section: Introductionmentioning

confidence: 99%

Measuring Biogenic Volatile Organic Compounds (BVOCs) from Vegetation in Terms of Ozone Reactivity

Matsumoto

2014

Aerosol Air Qual. Res.

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“…There are several types of accumulation-based flux measurements where samples are often accumulated and then analyzed. These include using the flux gradient method (e.g., Guenther et al, 1996;Pattey et al, 1999), relaxed eddy accumulation (REA) (e.g., Tani et al, 2002;Christensen et al, 2002;Lee et al, 2005;Kuhn et al, 2007) and, more recently, disjunct eddy accumulation (DEA) (e.g., Rinne et al, 2000Rinne et al, , 2002Turnipseed et al, 2009). The premise of DEA is similar to REA in that two segregated samples are taken based on the direction of the vertical wind.…”

Section: Introductionmentioning

confidence: 99%

A disjunct eddy accumulation system for the measurement of BVOC fluxes: instrument characterizations and field deployment

et al. 2012

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Abstract. Biological volatile organic compounds (BVOCs), such as isoprene and monoterpenes, are emitted in large amounts from forests. Quantification of the flux of BVOCs is critical in the evaluation of the impact of these compounds on the concentrations of atmospheric oxidants and on the production of secondary organic aerosol. A disjunct eddy accumulation (DEA) sampler system was constructed for the measurement of speciated BVOC fluxes. Unlike traditional eddy covariance (EC), the relatively new technique of disjunct sampling differs by taking short, discrete samples that allow for slower sampling frequencies. Disjunct sample airflow is directed into cartridges containing sorbent materials at sampling rates proportional to the magnitude of the vertical wind. Compounds accumulated on the cartridges are then quantified by thermal desorption and gas chromatography. Herein, we describe our initial tests to evaluate the disjunct sampler including the application of vertical wind measurements to create optimized sampling thresholds. Measurements of BVOC fluxes obtained from DEA during its deployment above a mixed hardwood forest at the University of Michigan Biological Station (Pellston, MI) during the 2009 CABINEX field campaign are reported. Daytime (09:00 a.m. to 05:00 p.m. LT) isoprene fluxes, when averaged over the footprint of the tower, were 1.31 mg m −2 h −1 which are comparable to previous flux measurements at this location. Speciated monoterpene fluxes are some of the first to be reported from this site. Daytime averages were 26.7 µg m −2 h −1 for α-pinene and 10.6 µg m −2 h −1 for β-pinene. These measured concentrations and fluxes were compared to the output of an atmospheric chemistry model, and were found to be consistent with our knowledge of the variables that control BVOCs fluxes at this site.

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“…Furthermore, there is no scope for retrospective corrections to the coordinate frame (Bowling et al, 1998). Despite these drawbacks, the REA method has been successfully applied to a range of vegetation types including grass land (Olofsson et al, 2003), forests (Schween et al, 1997;Gallagher et al, 2000;Tani et al, 2002;Greenberg et al, 2003;Ciccioli et al, 2003;Friedrichs et al, 1999) and lately in an urban study (Park et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Mixing ratios and eddy covariance flux measurements of volatile organic compounds from an urban canopy (Manchester, UK)

et al. 2009

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Abstract. Mixing ratios and fluxes of six selected volatile organic compounds (VOCs) were measured above the city of Manchester (UK) during the summer of 2006. A proton transfer reaction-mass spectrometer was used for the measurement of mixing ratios, and fluxes were calculated from these using both the disjunct and the virtual disjunct eddy covariance techniques. The two flux systems, which operated in alternate half hours, showed good agreement, with R 2 values ranging between 0.74 and 0.9 for the individual analytes. On average, fluxes measured in the disjunct mode were approximately 20% lower than those measured in the virtual mode. This difference is due to both the dampening of the VOC signal by the disjunct flux sampler and carry over from one sample to the next. Correcting for these effects reduced the difference to less than 7%. Observed fluxes are thought to be largely controlled by anthropogenic sources, with vehicle emissions the major contributor. However, both evaporative and biogenic emissions may account for some of the VOCs present. Concentrations and fluxes of the oxygenated compounds were highest on average, ranging between 0.15 to 1 mg m −2 h −1 ; the fluxes of aromatic compounds were lower, between 0.12 to 0.28 mg m −2 h −1 . The observed fluxes were up-scaled to give city wide emission estimates for each compound and the results compared to estimates made by the National Atmospheric Emission Inventory (NAEI) for the same flux footprint. Fluxes of toluene and benzene compared most closely differing by approximately 50%, while in contrast the oxygenated fluxes were found to be between 3.6-6.3 times larger than the annual average predicted by the NAEI.

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Monoterpene fluxes measured above a Japanese red pine forest at Oshiba plateau, Japan

Cited by 46 publications

References 24 publications

Measuring Biogenic Volatile Organic Compounds (BVOCs) from Vegetation in Terms of Ozone Reactivity

Measuring Biogenic Volatile Organic Compounds (BVOCs) from Vegetation in Terms of Ozone Reactivity

A disjunct eddy accumulation system for the measurement of BVOC fluxes: instrument characterizations and field deployment

Mixing ratios and eddy covariance flux measurements of volatile organic compounds from an urban canopy (Manchester, UK)

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