Chemical feedback effects on the spatial patterns of the NOx weekend effect: a sensitivity analysis
Published Web Location
http://www.atmos-chem-phys.net/14/1/2014/acp-14-1-2014.htmlAbstract
We examine spatial variations in the weekday-weekend pattern of NO 2 over the Los Angeles metropolitan area using the Ozone Monitoring Instrument (OMI) and then compare the observations to calculations using the WRF-Chem model. We find that the spatial pattern of the weekday-weekend variations of the NO2 column in the model is significantly different than observed. A sensitivity study shows that the contrasting spatial pattern of NO2 on weekdays and weekends is a useful diagnostic of emissions and chemistry. These improvements suggest that constraints from space-based observations of the processes affecting urban photochemistry (e.g., spatial patterns of emissions, ratios of VOC to NOx emissions, rate constants) are possible at a level of detail not previously described. © 2014 Author(s).
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