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Titolo:
Analysis of O-3 formation during a stagnation episode in central Tennesseein summer 1995
Autore:
Daum, PH; Kleinman, LI; Imre, D; Nunnermacker, LJ; Lee, YN; Springston, SR; Newman, L; Weinstein-Lloyd, J; Valente, RJ; Imhoff, RE; Tanner, RL; Meagher, JF;
Indirizzi:
Brookhaven Natl Lab, Dept Appl Sci, Environm Chem Div, Upton, NY 11973 USABrookhaven Natl Lab Upton NY USA 11973 ronm Chem Div, Upton, NY 11973 USA Tennessee Valley Author, Dept Atmospher Sci, Muscle Shoals, AL 35662 USA Tennessee Valley Author Muscle Shoals AL USA 35662 e Shoals, AL 35662 USA SUNY Old Westbury, Dept Chem & Phys, Old Westbury, NY 11586 USA SUNY Old Westbury Old Westbury NY USA 11586 s, Old Westbury, NY 11586 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D7, volume: 105, anno: 2000,
pagine: 9107 - 9119
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHEASTERN UNITED-STATES; SOUTHERN OXIDANTS; OZONE PRODUCTION; REGIONAL OZONE; BIOGENIC HYDROCARBONS; NASHVILLE; TRANSPORT; CHEMISTRY; PEROXIDES; NITROGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Daum, PH Brookhaven Natl Lab, Dept Appl Sci, Environm Chem Div, Upton, NY 11973 USA Brookhaven Natl Lab Upton NY USA 11973 Div, Upton, NY 11973 USA
Citazione:
P.H. Daum et al., "Analysis of O-3 formation during a stagnation episode in central Tennesseein summer 1995", J GEO RES-A, 105(D7), 2000, pp. 9107-9119

Abstract

O-3 production in the Nashville urban plume during the O-3 episode that occurred on July 11-July 13 1995, is examined to characterize the factors that control the ozone production rate and efficiency, and to examine the relative importance of natural and anthropogenic sources of hydrocarbons to ozone production in the urban center and outlying areas. The analysis focuses on data collected during aircraft flights on July 11 when the Nashville area was sampled more or less continuously from about 1000 to 1800 LT. The instantaneous ozone production rate P(O-3) in the downtown area from late morning through midafternoon on July 11 ranged between 10 and greater than 30 pphv/h depending on location. After 1700 local time, production rates dropped to a few ppbv/h owing to the diminished solar intensity. Instantaneous production efficiencies with respect to NOx in the downtown area ranged between 2.5 and 8, linearly depending on the ratio of the hydrocarbon to NOx, OHreactivity. Integral O-3 production efficiencies corrected for NOz losses ranged between 1.5 and 4, The lowest efficiency was observed in the downtown area in the morning where NOx concentrations were high and hydrocarbon toNOx reactivity ratios were the lowest. Throughout the day, P(O-3) in the downtown area was limited by the availability of hydrocarbons. Anthropogenichydrocarbons and CO contributed about 66% of the total hydrocarbon OR reactivity in the downtown area. In the mature urban plume downwind of Nashville, P(O-3) dropped to 6-9 ppbv/h at midafternoon and was controlled by the availability of NOx. Integral O-3 production efficiencies in the mature urban plume ranged between 3.5 and 4. When present in large quantities (1-3 ppbv), isoprene significantly increased both the rate and efficiency of ozone production as long as the photochemical system was not strongly NOx-limited.

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Documento generato il 06/04/20 alle ore 08:24:26