Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS
Item
Title (Dublin Core)
Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS
Description (Dublin Core)
Using measurements from the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) experiment, we show that methyl peroxy nitrate (CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub>) is present in concentrations of ~5–15 pptv in the springtime arctic upper troposphere. We investigate the regional and global effects of CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub> by including its chemistry in the GEOS-Chem 3-D global chemical transport model. We find that at temperatures below 240 K inclusion of CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub> chemistry results in decreases of up to ~20 % in NO<sub>x</sub>, ~20 % in N<sub>2</sub>O<sub>5</sub>, ~5 % in HNO<sub>3</sub>, ~2 % in ozone, and increases in methyl hydrogen peroxide of up to ~14 %. Larger changes are observed in biomass burning plumes lofted to high altitude. Additionally, by sequestering NO<sub>x</sub> at low temperatures, CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub> decreases the cycling of HO<sub>2</sub> to OH, resulting in a larger upper tropospheric HO<sub>2</sub> to OH ratio. These results may impact some estimates of lightning NO<sub>x</sub> sources as well as help explain differences between models and measurements of upper tropospheric composition.
Creator (Dublin Core)
Browne, E. C.
Perring, A. E.
Wooldridge, P. J.
Apel, E.
Hall, S. R.
Huey, L. G.
Mao, J.
Spencer, K. M.
Clair, J. M. St.
Weinheimer, A. J.
Wisthaler, A.
Cohen, R. C.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-11-4209-2011
https://acp.copernicus.org/articles/11/4209/2011/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
