Seasonal variations of monoterpene emissions from coniferous trees of different ages in Korea

Kim, Jo-Chun; Kim, Ki Jun; Kim, Deug-Soo; Han, Jin-Seok

doi:10.1016/j.chemosphere.2004.10.048

Cited by 87 publications

(41 citation statements)

References 25 publications

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“…The seasonal variations in SQT and MT emissions are increasingly recognized. Several studies have reported strong seasonal changes of MT emission rates, with generally higher values during the late spring to early summer and lower emissions during the fall (e.g., refs [46][47][48][49][50]. The available studies on SQT (24)(25)(26)(27)51) suggest that, similar to MT, seasonal changes in SQT basal emission rates appear to be significant, with highest rates occurring during the early to mid-growing season and SQT basal emission rates possibly peaking ∼1 month after MT (26).…”

Section: Resultsmentioning

confidence: 99%

Sesquiterpene Emissions from Pine Trees − Identifications, Emission Rates and Flux Estimates for the Contiguous United States

Helmig

Ortega

Duhl

et al. 2007

Environ. Sci. Technol.

172

144

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Biogenic volatile organic compound (BVOC) emissions were studied using vegetation enclosure experiments. Particular emphasis was given to sesquiterpene compounds (SQT), although monoterpenes (MT) were also characterized. SQT were detected in emissions from seven (out of eight) pine species that were examined. Thirteen SQT compounds were identified; the most abundant ones were -caryophyllene, R-bergamotene, -farnesene, and R-farnesene, with emission rates increasing exponentially with temperature. Regression analysis yielded exponential dependencies of both MT and SQT emissions on temperature of the form E ) E 0 × exp( (T -T 0 )). This resulted in SQT basal emission rates (E 0 defined at T 0 ) 30°C) ranging between <4 and 620 ng (carbon) gdw -1 h -1 (gdw ) gram dry weight). The average value of the exponential temperature response factor for SQT emissions, taken from all experiments, was 0.17°C -1 , whereas the value for monoterpenes was 0.11°C -1 . The average, total SQT emissions from pines were estimated to be 9, 16, and 29% of the MT emissions at 20, 30, and 40°C respectively. The emission factors and -factors determined from these measurements were used to estimate pine tree MT and SQT emission distributions for the contiguous United States using MEGAN (model of emissions of gases and aerosols from nature, . SQT fluxes reaching 10-40 mg m -2 for the month of July were estimated for extensive areas of most western and southern U.S. states.

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Section: Resultsmentioning

confidence: 99%

Sesquiterpene Emissions from Pine Trees − Identifications, Emission Rates and Flux Estimates for the Contiguous United States

Helmig

Ortega

Duhl

et al. 2007

Environ. Sci. Technol.

172

144

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“…Other research has shown that MT basal emission rates from coniferous trees undergo significant seasonal changes (e.g. Pen˜uelas and Llusia, 2001;Komenda and Koppmann, 2002;Pressley et al, 2004;Kim et al, 2005), with maximum emission rates typically observed during the summer. The only seasonal SQT emission rate studies (Scots pine in Finland) reported so far Hakola et al, 2005Hakola et al, , 2006 similarly suggest higher SQT basal emission rates during the middle of the growing season; early fall (September) emission rates were significantly lower than mid-summer values.…”

Section: Resultsmentioning

confidence: 99%

Sesquiterpene emissions from loblolly pine and their potential contribution to biogenic aerosol formation in the Southeastern US

Helmig

Ortega

Herrick

et al. 2006

Atmospheric Environment

133

108

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Sesquiterpene (SQT) and montoterpene (MT) emissions from loblolly pine (Pinus taeda L.) were studied by branch enclosure experiments at Duke Forest in Chapel Hill, NC. Four SQT (b-caryophyllene, a-bergamotene, a-humulene, b-farnesene), five MT (a-pinene, b-pinene, b-myrcene, b-phellandrene, limonene), and the oxygenated MT linalool were identified. Emission rates of both compound classes increased exponentially with temperature, albeit SQT temperature coefficients (0.12-0.18 K À1 ) were higher than for MT (0.068-0.15 K À1 ), resulting in an increased contribution of SQT to the overall biogenic volatile organic compound (BVOC) flux during warm temperature conditions. The highly correlated variables of light and temperature conditions preclude a rigorous characterization of their individual roles in driving these emissions. However, the observations indicate that there may be both temperature-only and temperature/light-dependent components contributing to SQT emission variations. When normalized to 30 1C using the best-fit temperature algorithm, total SQT basal emission rate was 450 ng g À1 h À1 . The potential contribution of SQT from all pine trees (based on the loblolly pine emission factors) to secondary, biogenic organic aerosol in 12 southeastern US states was estimated to be 7 Â 10 6 kg for the month of September which constitutes an appreciable portion of the overall PM 2.5 emission budget. r

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“…Kim et al, 2010). The pine trees (P. koraiensis) surrounding the TRF chemistry tower are expected to emit monoterpenes but lack isoprene emission (Kim et al, 2005). A recent branch enclosure measurement study (Lim et al, 2011) clearly shows that the oak trees (e.g.…”

Section: Vocs Analysis Using Ptr-ms and Gcemsmentioning

confidence: 99%

Impact of biogenic volatile organic compounds on ozone production at the Taehwa Research Forest near Seoul, South Korea

Kim

Jiang

Lee

et al. 2013

Atmospheric Environment

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h i g h l i g h t s< We presented trace gas observation results in the suburban Seoul Metropolitan Area. < We found BVOCs are dominant OH chemical sinks. The importance of biogenic volatile organic compounds (BVOCs) in understanding of air-quality and climate on regional to global scales has been highlighted in a number of modeling and observational studies. At the same time, another important emerging research topic in atmospheric chemistry is the regional and global impacts of fast growing East Asian megacities. These two research topics must be integrated in order to adequately understand and address air quality challenges emerging from Eastern Asian megacities surrounded by planted or natural forest areas. We present initial measurement results for May, June and September 2011 from the Taehwa Research Forest (TRF) which has been developed to serve as a long term observatory for investigating biosphereeatmosphere interactions at the edge of the Seoul Metropolitan Area (population of w23.5 million). The comprehensive measurement datasets of ozone and its precursors such as CO, NO x , SO 2 and VOCs shows that high ozone episodes in the suburban site could not be explained by just anthropogenic pollutants alone. In addition, isoprene (C 5 H 8 ) and monoterpenes (C 10 H 16 ) were observed as two of the most important OH chemical sinks inside of the forest canopy. In order to understand the impacts of these BVOCs on ozone and related photochemistry, we conducted model sensitivity simulations using a coupled meteorology-chemistry model (WRF-Chem) for conditions including with and without BVOC emissions. The modeling results suggest that BVOC emissions could enhance regional daytime ozone production from 5 to 20 ppbv. The observed temporal variations in ozone correspond well with the variations in BVOCs, which likely reflects the influence of BVOCs on ozone formation. These findings strongly suggest that interactions between anthropogenic pollutants and BVOCs must be understood and quantified in order to assess photochemical ozone formation in the regions surrounding East Asian megacities.

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Seasonal variations of monoterpene emissions from coniferous trees of different ages in Korea

Cited by 87 publications

References 25 publications

Sesquiterpene Emissions from Pine Trees − Identifications, Emission Rates and Flux Estimates for the Contiguous United States

Sesquiterpene Emissions from Pine Trees − Identifications, Emission Rates and Flux Estimates for the Contiguous United States

Sesquiterpene emissions from loblolly pine and their potential contribution to biogenic aerosol formation in the Southeastern US

Impact of biogenic volatile organic compounds on ozone production at the Taehwa Research Forest near Seoul, South Korea

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