References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-7215-2010

The production and persistence of ΣRONO2 in the Mexico City plume

Perring

A. E.

¹ ⁸ ⁹ Bertram

T. H.

¹ ¹⁰ Farmer

D. K.

¹ ⁹ Wooldridge

P. J.

¹ Dibb

² Blake

N. J.

³ Blake

D. R.

³ Singh

H. B.

⁴ Fuelberg

⁵ Diskin

⁶ Sachse

⁶ Cohen

R. C.

¹ ⁷

Department of Chemistry, University of California Berkeley, Berkeley, CA, USA

Climate Change Research Institute, University of New Hampshire, Durham, NH, USA

Department of Chemistry, University of California Irvine, Irvine, CA, USA

NASA Ames Research Center, Moffett Field, CA, USA

Department of Meteorology, Florida State University, Tallahassee, FL, USA

NASA Langley Research Center, Hampton, VA, USA

Department of Earth and Planetary Sciences, University of California Berkeley, Berkeley, CA, USA

now at: Chemical Sciences Division, Earth Systems Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA

now at: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA

now at: Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA

06 08 2010

10 15 7215 7229

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/10/7215/2010/acp-10-7215-2010.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/7215/2010/acp-10-7215-2010.pdf

Alkyl and multifunctional nitrates (RONO2, ΣANs) have been observed to be a significant fraction of NOy in a number of different chemical regimes. Their formation is an important free radical chain termination step ending production of ozone and possibly affecting formation of secondary organic aerosol. ΣANs also represent a potentially large, unmeasured contribution to OH reactivity and are a major pathway for the removal of nitrogen oxides from the atmosphere. Numerous studies have investigated the role of nitrate formation from biogenic compounds and in the remote atmosphere. Less attention has been paid to the role ΣANs may play in the complex mixtures of hydrocarbons typical of urban settings. Measurements of total alkyl and multifunctional nitrates, NO2, total peroxy nitrates (ΣPNs), HNO3 and a representative suite of hydrocarbons were obtained from the NASA DC-8 aircraft during spring of 2006 in and around Mexico City and the Gulf of Mexico. ΣANs were observed to be 10–20% of NOy in the Mexico City plume and to increase in importance with increased photochemical age. We describe three conclusions: (1) Correlations of ΣANs with odd-oxygen (Ox) indicate a stronger role for ΣANs in the photochemistry of Mexico City than is expected based on currently accepted photochemical mechanisms, (2) ΣAN formation suppresses peak ozone production rates by as much as 40% in the near-field of Mexico City and (3) ΣANs play a significant role in the export of NOy from Mexico City to the Gulf Region.

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