Atmos. Chem. Phys. Discuss., 7, 11091-11121, 2007
www.atmos-chem-phys-discuss.net/7/11091/2007/
doi:10.5194/acpd-7-11091-2007
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Observations of the effects of temperature on atmospheric HNO3, ∑ANs, ∑PNs, and NOx: evidence for a temperature dependent HOx source
D. A. Day1, P. J. Wooldridge1, and R. C. Cohen1,2,3
1Department of Chemistry, UC Berkeley, USA
2Department of Earth and Planetary Science, UC Berkeley, USA
3Energy and Environment Technologies Division, Lawrence Berkeley National Laboratory, USA

Abstract. We describe observations of atmospheric reactive nitrogen compounds including NO, NO2, total peroxy nitrates, total alkyl nitrates, and HNO3 and their correlation with temperature. The measurements were made at a rural location 1315 m a.s.l. on the western slope of the Sierra Nevada Mountains in California during summer of 2001. The ratio of HNO3 to its source molecule, NO2, and the ratio of HNO3 to all other higher oxides of nitrogen (NOz) all increase with increasing temperature. Analysis of these increases suggests they are due to a steep increase in OH of between a factor of 2 and 3 over the range 18–32°C. Total peroxy nitrates decrease and total alkyl nitrates increase over the same temperature range. The decrease in the total peroxy nitrates is shown to be much less than expected if the rate of thermal decomposition were the sole important factor and to be consistent with the increase in OH inferred from the temperature trends in the HNO3/NO2 ratio.

Citation: Day, D. A., Wooldridge, P. J., and Cohen, R. C.: Observations of the effects of temperature on atmospheric HNO3, ∑ANs, ∑PNs, and NOx: evidence for a temperature dependent HOx source, Atmos. Chem. Phys. Discuss., 7, 11091-11121, doi:10.5194/acpd-7-11091-2007, 2007.
 
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