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Titolo:
ON THE BUDGET OF OH RADICALS AND OZONE IN AN URBAN PLUME FROM THE DECAY OF C-5-C-8 HYDROCARBONS AND NOX
Autore:
KRAMP F; VOLZTHOMAS A;
Indirizzi:
KFA JULICH GMBH,FORSCHUNGSZENTRUM,INST CHEM & DYNAM GEOSPHARE 2,POSTFACH 1913 D-52425 JULICH GERMANY
Titolo Testata:
Journal of atmospheric chemistry
fascicolo: 1-3, volume: 28, anno: 1997,
pagine: 263 - 282
SICI:
0167-7764(1997)28:1-3<263:OTBOOR>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOS-ANGELES ATMOSPHERE; GAS-PHASE REACTIONS; PACIFIC AIR MASSES; PHOTOCHEMICAL HISTORIES; RURAL TROPOSPHERE; POINT-ARENA; CHEMISTRY; HYDROXYL; RATIOS; MECHANISMS;
Keywords:
OZONE; HYDROCARBONS; NOX; PHOTOCHEMISTRY; OH-RADICALS; BUDGET;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
F. Kramp e A. Volzthomas, "ON THE BUDGET OF OH RADICALS AND OZONE IN AN URBAN PLUME FROM THE DECAY OF C-5-C-8 HYDROCARBONS AND NOX", Journal of atmospheric chemistry, 28(1-3), 1997, pp. 263-282

Abstract

Simultaneous measurements of ozone and ozone precursors were made during a field campaign at Schauinsland in the Black Forest and in the valley north of Schauinsland that channels the flow of polluted air fromthe city of Freiburg to the site. From the decay of hydrocarbons and NOx between the two measuring sites and the known rate coefficients, the concentration of OH radicals was calculated. From a budget analysisof OH and HOx it is concluded that the relatively high OH concentrations (5-8 x 10(6) cm(-3)) in the presence of high NO2 concentrations cannot be explained by the known primary sources. The budget can be closed if efficient recycling of OH via HO2 is assumed to occur and that, based on the measured hydrocarbons, 2 HO2 molecules are formed for each OH radical that reacts with a hydrocarbon molecule. This assumption is in accordance with the budget of O-x obtained from our measurementsand with results from earlier measurements of alkylnitrates and peroxy radicals at Schauinsland. A possible conclusion is that the decay ofprecursors and production of photooxidants in urban plumes proceeds at a faster rate than is currently assumed. The potential role of biogenic hydrocarbons for the radical budget is also discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 23:41:34