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Titolo:
Particle formation and growth from ozonolysis of alpha-pinene
Autore:
Hoppel, W; Fitzgerald, J; Frick, G; Caffrey, P; Pasternack, L; Hegg, D; Gao, S; Leaitch, R; Shantz, N; Cantrell, C; Albrechcinski, T; Ambrusko, J; Sullivan, W;
Indirizzi:
USN, Res Lab, Washington, DC 20375 USA USN Washington DC USA 20375USN, Res Lab, Washington, DC 20375 USA Calspan Univ Buffalo, Res Ctr, Buffalo, NY 14225 USA Calspan Univ BuffaloBuffalo NY USA 14225 Res Ctr, Buffalo, NY 14225 USA Natl Ctr Atmospher Res, Boulder, CO 80303 USA Natl Ctr Atmospher Res Boulder CO USA 80303 er Res, Boulder, CO 80303 USA Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 Atmospher Sci, Seattle, WA 98195 USA Meteorol Serv Canada, Air Qual Monitoring Div, Toronto, ON M3H 5T4, CanadaMeteorol Serv Canada Toronto ON Canada M3H 5T4 oronto, ON M3H 5T4, Canada
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D21, volume: 106, anno: 2001,
pagine: 27603 - 27618
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTICOMPONENT AEROSOL DYNAMICS; DIMENSIONAL SECTIONAL MODEL; MARINE BOUNDARY-LAYER; PARTICULATE PRODUCTS; ORGANIC AEROSOLS; BETA-PINENE; OXIDATION; OZONE; YIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Hoppel, W Computat Phys Inc, Springfield, VA USA Computat Phys Inc Springfield VA USA Inc, Springfield, VA USA
Citazione:
W. Hoppel et al., "Particle formation and growth from ozonolysis of alpha-pinene", J GEO RES-A, 106(D21), 2001, pp. 27603-27618

Abstract

Observations of particle nucleation and growth during ozonolysis of cc-pinene were carried out in Calspan's 600 m(3) environmental chamber utilizing relatively low concentrations of cc-pinene (15 ppb) and ozone (100 ppb). Model simulations with a comprehensive sectional aerosol model which incorporated the relevant gas-phase chemistry show that the observed evolution of the size distribution could be simulated within the accuracy of the experiment by assuming only one condensable product produced with a molar yield of 5% to 6% and a saturation vapor pressure (SVP) of about 0.01 ppb or less. While only one component was required to simulate the data, more than one product may have been involved, in which case the one component must be viewed as a surrogate having an effective SVP of 0.01 ppb or less. Adding trace amounts Of SO2 greatly increased the nucleation rate while having negligible effect on the overall aerosol yield. We are unable to explain the observed nucleation in the alpha -pinene/ozone system in terms of classical nucleation theory. The nucleation rate and, more importantly, the slope of the nucleation rate versus the vapor pressure of the nucleating species would suggest that the nucleation rate in the a-pinene/ozone system may be limited by the initial nucleation steps (i.e., dimer, trimer, or adduct formation).

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Documento generato il 19/06/18 alle ore 00:47:21