Analysis of trace oxygenated hydrocarbons in the environment

Pierotti, David

doi:10.1007/bf00115780

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Although gas chromatographic analysis of cryogenically concentrated samples is not a new technique, three specialized features differentiated the analysis approach used here from those that were used in many of the studies cited above: (1) an all-Teflon sample acquisition system (with one exception noted below) integrated with immediate gas chromatographic analysis, (2) an in-line trap to remove most of the ozone in the incoming sample stream and (3) an in-line trap to remove most of the water from ambient air samples prior to cryo-collection. The all-Teflon sample acquisition system, as Pierotti [1990b] also recognized, prevented the loss of reactive and/or hydrophilic compounds on system plumbing. The removal of most of the water prior to cryo-collection allowed the use of a capillary sample loop and the rapid quantitative release of even highly water soluble species from the cryo-collected sample.…”

Section: Analytical Systemmentioning

confidence: 98%

Hydrocarbon measurements in the southeastern United States: The Rural Oxidants in the Southern Environment (ROSE) Program 1990

Goldan¹,

Kuster²,

Fehsenfeld³

et al. 1995

J. Geophys. Res.

208

114

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An automated gas Chromatographic system was employed at a rural site in western central Alabama to measure atmospheric hydrocarbons and oxygenated hydrocarbons (oxy‐hydrocarbons) on an hourly basis from June 8 to July 19, 1990. The location, which was a designated site for the Southern Oxidant Study (SOS), was instrumented for a wide variety of measurements allowing the hydrocarbon and oxy‐hydrocarbon measurements to be interpreted both in terms of meteorological data and as part of a large suite of gas phase measurements. Although the site is situated in a Loblolly pine plantation, isoprene was observed to be the dominant hydrocarbon during the daytime with afternoon maxima of about 7 parts per billion by volume (ppbv). Decrease of isoprene after sunset was too rapid to be accounted for solely on the basis of gas phase chemistry. During the nighttime, α‐pinene and β‐pinene were the dominant hydrocarbons of natural origin. The ratio of α‐pinene to β‐pinene showed a well‐defined diurnal pattern, decreasing by more than 30% during the night; a decrease that could be understood on the basis of local gas phase chemistry. Oxy‐hydrocarbons, dominated by methanol and acetone, were the most abundant compounds observed. On a carbon atom basis, the oxy‐hydrocarbons contributed about 46% of the measured atmospheric burden during the daytime and about 40% at night. The similarity of the observed diurnal methanol variation to that of isoprene and subsequent measurements [McDonald and Fall, 1993] indicate that much of the observed methanol was of local biogenic origin. Correlation of acetone with methanol suggests that it, also, has a significant biogenic source. In spite of the site's rural location, anthropogenic hydrocarbons constituted, on a carbon atom basis, about 21% of the hydrocarbon burden measured during the daytime and about 55% at night. Significant diurnal variations of the anthropogenic hydrocarbons, with increases at night, appeared to be driven by the frequent formation of a shallow nocturnal boundary layer.

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Section: Analytical Systemmentioning

confidence: 98%

Hydrocarbon measurements in the southeastern United States: The Rural Oxidants in the Southern Environment (ROSE) Program 1990

Goldan¹,

Kuster²,

Fehsenfeld³

et al. 1995

J. Geophys. Res.

208

114

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“…We also assume in the model a small biogenic source of acetaldehyde (2% of isoprene emission; Pierotti, 1988), which provides an additional precursor for PAN. The isoprene emission rate within a canopy grid cell is computed from the leaf area density, the temperature, and the solar irradiance attenuated by the optical depth of the canopy overhead, using functional relations from the literature (Tingey et al, 1979;Lamb et al, 1987;Verstraete, 1987).…”

Section: Modeling the Effects Of Deforestation On Tropospheric Chemistrymentioning

confidence: 99%

Effects of tropical deforestation on global and regional atmospheric chemistry

et al. 1991

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A major portion of tropospheric photochemistry occurs in the tropics. Deforestation, colonization, and development of tropical rain forest areas could provoke significant changes in emissions of radiatively and photochemically active trace gases. A brief review of studies on trace-gas emissions in pristine and disturbed tropical habitats is followed by an effort to model regional tropospheric chemistry under undisturbed and polluted conditions. Model results suggest that changing emissions could stimulate photochemistry leading to enhanced ozone production and greater mineral acidity in rainfall in colonized agricultural regions. Model results agree with measurements made during the NASA ABLE missions. Under agricultural/pastoral development scenarios, tropical rain forest regions could export greater levels of N20 , CH4, CO, and photochemical precursors of NOy and 03 to the global atmosphere with implications for climatic warming.

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“…An intercomparison of trapping system for gaseous and condensed formic and acetic acids has been published [Keene et al, 1989] as has a comparison between long‐path FTIR and an alkaline trap/liquid chromatography technique in urban air [Grosjean et al, 1990]. A novel two‐dimensional trapping gas chromatography technique for carbonyls, using both FlD and photoionization detection, has been described by Pierotti [1990].…”

Section: Reductant Speciesmentioning

confidence: 99%

Instrumentation for Chemical Species Measurements in the Troposphere and Stratosphere

Kolb

1991

Reviews of Geophysics

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Analysis of trace oxygenated hydrocarbons in the environment

Cited by 15 publications

References 8 publications

Hydrocarbon measurements in the southeastern United States: The Rural Oxidants in the Southern Environment (ROSE) Program 1990

Hydrocarbon measurements in the southeastern United States: The Rural Oxidants in the Southern Environment (ROSE) Program 1990

Effects of tropical deforestation on global and regional atmospheric chemistry

Instrumentation for Chemical Species Measurements in the Troposphere and Stratosphere

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