Diurnal variations of atmospheric isoprene and monoterpene hydrocarbons in an agricultural area in summertime

Yokouchi, Yoko; Ambe, Yoshinari

doi:10.1029/jd093id04p03751

Cited by 50 publications

(8 citation statements)

References 23 publications

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“…Typical air concentrations vary diumaUy as reported by other authors at other sites (Roberts et al, 1985;Yokouchi and Ambe, 1988;Riba et al, 1987;Steinbrecher, 1990), having high concentrations at night and low during the day. Daytime concentrations observed in Jadrahs ranged from 0.01 to 0.5 ppbv total terpenes, while nighttime values ranged from 0.2 to 8 ppbv in the forest and 0.05 to 4.5 ppbv above.…”

Section: Concentrationssupporting

confidence: 74%

Monoterpene concentrations in and above a forest of scots pine

Janson

1992

J Atmos Chem

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Diurnal and vertical ambient air measurements of the monoterpenes have been made in and above a Scots pine (Pinus sylvestris) forest of central Sweden, within the boreal northern coniferous biome. Sampling was done with Tenax TA, and analysis by GC and ion trap detection. Daytime mixing ratios were on the order of tenths of a ppbv from the forest floor to the top of the forest, and a factor of 2 or 3 lower above the forest. Mixing ratios at night were at the ppbv level, highest near the forest floor and the crown, and decreased with height above the forest. The highest total concentration observed was 8 ppbv inside the forest at 3 am (GMT). The average terpene composition was 3-carene 32%, ¢x-pinene 29%, limonene 18%, 13-pinene 10%, 13-phellandrene 7%, camphene 5%, and sabinene at less than 2%. The 3-carene/ot-pinene ratio varied with wind direction and speed, relative humidity, and wet/dry vegetation, but not with ozone or NO2 concentration, solar radiation, or temperature. Variations in the observed terpene composition at the sampling site are mainly caused by the influence of other vegetation in the vicinity of the site. It would seem that wet Scots pine emits more 3-carene relative to ct-pinene than does dry pine.

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Section: Concentrationssupporting

confidence: 74%

Monoterpene concentrations in and above a forest of scots pine

Janson

1992

J Atmos Chem

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“…There are only a limited number of measurements, which show a large variability (Lamontagne et al, 1974;Shaw et al, 1983;Greemberg et al, 1985;Ayers and Gillett, 1988;Rasmussen and Khalil, 1988;Yokouchi and Ambe, 1988;Zimmerman et al, 1988;Bonsang et al, 1990Bonsang et al, , 1991Prinn, 1990, 1993;Plass et al, 1990;Andronache et al, 1994;Bottenheim and Shepherd, 1995). In this paper, as part of a chemical characterization of the atmosphere of the Venezuelan savannah climatic region, we report the concentrations of C2 to C6 hydrocarbons measured at clean 'pristine' sites and locations affected by emissions of hydrocarbons from oil and gas producing fields.…”

Section: Introductionmentioning

confidence: 99%

Natural and anthropogenic C2 to C6 hydrocarbons in the central-eastern Venezuelan atmosphere during the rainy season

et al. 1996

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The levels of low molecular weight hydrocarbons were measured at pristine sites and rural locations affected by hydrocarbon emissions from oil and gas producing fields in Venezuela. At the clean sites, lower concentrations of C2 to C6 alkanes were observed, whereas, in comparison with remotes sites, very much higher levels were measured at the polluted sites. Alkenes present relatively high concentrations, with isoprene being the most abundant, all over the study region. The main sources of alkenes are likely to be natural, mainly from vegetation. The levels of alkanes recorded at the clean sites and the alkene levels found everywhere in the region are in agreement with the values reported for other clean sites in the tropics. The increase of ozone production capacity due to the anthropogenic emissions of alkanes from oil and gas fields was estimated. Due to the presence in the atmosphere of important amounts of naturally emitted isoprene, ethene and propene, which makes a substantial contribution to the reactivity of the hydrocarbon mixture, a small increase (< 5%) was estimated to occur in the capacity of the ozone production at a regional scale during the rainy season.

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“…Therefore, a focusing step on the capillary column is needed in order to make the best use of high resolution chromatography. System A was originally developed for the continuous monitoring of trace organic volatiles at a field station (Yokouchi et al 1986;Yokouchi and Ambe 1988). We used the latter method, since it is more convenient and monoterpenes are effectively focused at the lowest possible temperature of a cryogenic oven (-50 DC).…”

Section: Capillary Gc (Fld)mentioning

confidence: 99%

“…The most noticeable feature of monoterpene concentration in the atmosphere is that it varies greatly from day to day, and from season to season (Yokouchi et al 1983;Roberts et al 1985;Riba et al 1987;Yokouchi and Ambe 1988), reflecting the variation of their emission rate and their disappearing rate through dilution and reaction. Thus, numerous measurements should be performed to accurately assess atmospheric levels.…”

Section: Features Of Atmospheric Monoterpenesmentioning

confidence: 99%