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Titolo:
Measurement and analysis of atmospheric concentrations of isoprene and itsreaction products in central Texas
Autore:
Wiedinmyer, C; Friedfeld, S; Baugh, W; Greenberg, J; Guenther, A; Fraser, M; Allen, D;
Indirizzi:
Rice Univ, Dept Environm Sci & Engn, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 Environm Sci & Engn, Houston, TX 77005 USA Univ Texas, Dept Chem Engn, Austin, TX 78712 USA Univ Texas Austin TX USA78712 exas, Dept Chem Engn, Austin, TX 78712 USA Natl Ctr Atmospher Res, Div Atmospher Chem, Boulder, CO 80307 USA Natl CtrAtmospher Res Boulder CO USA 80307 r Chem, Boulder, CO 80307 USA
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 6, volume: 35, anno: 2001,
pagine: 1001 - 1013
SICI:
1352-2310(2001)35:6<1001:MAAOAC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOLATILE ORGANIC-COMPOUNDS; RELAXED EDDY ACCUMULATION; NATURAL HYDROCARBONS; UNITED-STATES; INCREMENTAL REACTIVITIES; CARBONYL-COMPOUNDS; OZONE FORMATION; RURAL OZONE; NOX; MECHANISM;
Keywords:
biogenic emissions; isoprene; isoprene reactions; ozone formation; Texas;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Fraser, M Rice Univ, Dept Environm Sci & Engn, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 ci & Engn, Houston, TX 77005 USA
Citazione:
C. Wiedinmyer et al., "Measurement and analysis of atmospheric concentrations of isoprene and itsreaction products in central Texas", ATMOS ENVIR, 35(6), 2001, pp. 1001-1013

Abstract

A field experiment was conducted in August 1998 to investigate the concentrations of isoprene and isoprene reaction products in the surface and mixedlayers of the atmosphere in Central Texas. Measured near ground-level concentrations of isoprene ranged from 0.3 (lower limit of detection - LLD) to 10.2 ppbv in rural regions and from 0.3 to 6.0 ppbv in the Austin urban area. Rural ambient formaldehyde levels ranged from 0.4 ppbv (LLD) to 20.0 ppbv for 160 rural samples collected, while the observed range was smaller at Austin (0.4-3.4ppbv) for a smaller set of samples (37 urban samples collected). Methacrolein levels did not vary as widely, with rural measurements from 0.1ppbv (LLD) to 3.7 ppbv and urban concentrations varying between 0.2 and 5.7 ppbv, Isoprene flux measurements, calculated using a simple box model and measured mixed-layer isoprene concentrations, were in reasonable agreement with emission estimates based on local ground cover data. Ozone formation attributable to biogenic hydrocarbon oxidation was also calculated Thecalculations indicated that if the ozone formation occurred at low VOC/NOxratios, up to 20 ppbv of ozone formed could be attributable to biogenic photooxidation. In contrast, if the biogenic hydrocarbon reaction products were formed under low NOx conditions, ozone production attributable to biogenics oxidation would be as low as 1 ppbv, This variability in ozone formation potentials implies that biogenic emissions in rural areas will not lead to peak ozone levels in the absence of transport of NOx from urban centers or large rural NOx sources. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 29/02/20 alle ore 15:00:49