The fate of NOx emissions due to nocturnal oxidation at high latitudes: 1-D simulations and sensitivity experiments
Item
Title (Dublin Core)
The fate of NOx emissions due to nocturnal oxidation at high latitudes: 1-D simulations and sensitivity experiments
Description (Dublin Core)
The fate of nitrogen oxide pollution during high-latitude winter is controlled by reactions of dinitrogen pentoxide (N<sub>2</sub>O<sub>5</sub>) and is highly affected by the competition between heterogeneous atmospheric reactions and deposition to the snowpack. MISTRA (MIcrophysical STRAtus), a 1-D photochemical model, simulated an urban pollution plume from Fairbanks, Alaska to investigate this competition of N<sub>2</sub>O<sub>5</sub> reactions and explore sensitivity to model parameters. It was found that dry deposition of N<sub>2</sub>O<sub>5</sub> made up a significant fraction of N<sub>2</sub>O<sub>5</sub> loss near the snowpack, but reactions on aerosol particles dominated loss of N<sub>2</sub>O<sub>5</sub> over the integrated atmospheric column. Sensitivity experiments found the fate of NO<sub>x</sub> emissions were most sensitive to NO emission flux, photolysis rates, and ambient temperature. The results indicate a strong sensitivity to urban area density, season and clouds, and temperature, implying a strong sensitivity of the results to urban planning and climate change. Results suggest that secondary formation of particulate (PM<sub>2.5</sub>) nitrate in the Fairbanks downtown area does not contribute significant mass to the total PM<sub>2.5</sub> concentration, but appreciable amounts are formed downwind of downtown due to nocturnal NO<sub>x</sub> oxidation and subsequent reaction with ammonia on aerosol particles.
Creator (Dublin Core)
Joyce, P. L.
von Glasow, R.
Simpson, W. R.
Date (Dublin Core)
2018-09-14
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-14-7601-2014
https://acp.copernicus.org/articles/14/7601/2014/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
