Reactive uptake coefficients for N2O5 determined from aircraft measuremnts during the Second Texas Air Quality Study: Comparison to current model parameterizations

Brown, S.S.; Trainer, M.; Middlebrook, A.M.; Fuchs, H.; Roberts, J.M.; Ravishankara, A.R.; Bahreini, R.; Neuman, J.A.; Wollny, A.G.; Osthoff, H.D.; Ryerson, T.B.; Dubé, W. P.; Brock, C.A.; Fehsenfeld, F.C.; Atlas, E.

doi:10.1029/2008JD011679

Journal Article

Reactive uptake coefficients for N2O5 determined from aircraft measuremnts during the Second Texas Air Quality Study: Comparison to current model parameterizations

Brown, S. S. ; Dubé, W. P. ; Fuchs, H.FZJ* ; Ryerson, T. B. ; Wollny, A. G. ; Brock, C. A. ; Bahreini, R. ; Middlebrook, A. M. ; Neuman, J. A. ; Atlas, E. ; Roberts, J. M. ; Osthoff, H. D. ; Trainer, M. ; Fehsenfeld, F. C. ; Ravishankara, A. R.

2009
Union Washington, DC

Journal of Geophysical Research 114, 1 - 16 (2009) [10.1029/2008JD011679]

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Please use a persistent id in citations: http://hdl.handle.net/2128/20433 doi:10.1029/2008JD011679

Abstract: This paper presents determinations of reactive uptake coefficients for N2O5, gamma( N2O5), on aerosols from nighttime aircraft measurements of ozone, nitrogen oxides, and aerosol surface area on the NOAA P-3 during Second Texas Air Quality Study (TexAQS II). Determinations based on both the steady state approximation for NO3 and N2O5 and a plume modeling approach yielded gamma(N2O5) substantially smaller than current parameterizations used for atmospheric modeling and generally in the range 0.5-6 x 10(-3). Dependence of gamma(N2O5) on variables such as relative humidity and aerosol composition was not apparent in the determinations, although there was considerable scatter in the data. Determinations were also inconsistent with current parameterizations of the rate coefficient for homogenous hydrolysis of N2O5 by water vapor, which may be as much as a factor of 10 too large. Nocturnal halogen activation via conversion of N2O5 to ClNO2 on chloride aerosol was not determinable from these data, although limits based on laboratory parameterizations and maximum nonrefractory aerosol chloride content showed that this chemistry could have been comparable to direct production of HNO3 in some cases.

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Meteorology & Atmospheric Sciences

Note: This work was supported by the NOAA Atmospheric Chemistry and Climate Program and the Texas Air Quality Study. The authors thank Prakash Bhave for useful discussions regarding uptake coefficient parameterizations. The authors also thank the crew of the NOAA P-3 for their dedication and professionalism.

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