Direct observations of N2O5 reactivity on ambient aerosol particles

被引：113

作者：

Bertram, Timothy H. ^{[1
]}

Thornton, Joel A. ^{[1
]}

Riedel, Theran P. ^{[2
]}

Middlebrook, Ann M. ^{[3
]}

Bahreini, Roya ^{[3
,5
]}

Bates, Timothy S. ^{[4
]}

Quinn, Patricia K. ^{[4
]}

Coffman, Derek J. ^{[4
]}

机构：

[1] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA

[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[3] NOAA, Earth Syst Res Lab, Boulder, CO 80305 USA

[4] NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA

[5] Univ Colorado, CIRES, Boulder, CO 80309 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

关键词：

HETEROGENEOUS HYDROLYSIS; MASS-SPECTROMETER; GASEOUS N2O5; AMMONIUM; IMPACT; CLNO2; PHASE;

D O I：

10.1029/2009GL040248

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

N2O5 reactivity has been measured directly for the first time on ambient aerosol particles using an entrained aerosol flow reactor coupled to a custom-built chemical ionization mass spectrometer at two urban locations during summer. The observed N2O5 reactivity is a strong function of both relative humidity ( RH) and particle chemical composition. We show that particulate organic mass loadings, together with ambient relative humidity, play a leading role in determining the reaction rate of N2O5 with particles. Our observed reactivity values are both more variable and, at times, as much as a factor of ten lower than currently implemented large-scale model parameterizations would predict. Such discrepancies have likely consequences for predictions of NOx availability and ozone production, and the sensitivity of these quantities to aerosol particle loadings. Citation: Bertram, T. H., J. A. Thornton, T. P. Riedel, A. M. Middlebrook, R. Bahreini, T. S. Bates, P. K. Quinn, and D. J. Coffman ( 2009), Direct observations of N2O5 reactivity on ambient aerosol particles, Geophys. Res. Lett., 36, L19803, doi:10.1029/2009GL040248.

引用

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