Supplement of Formation of reactive nitrogen oxides from urban grime photochemistry

Formation of Reactive Nitrogen Oxides from Urban Grime Photochemistry

Impervious surfaces are ubiquitous in urban environments and constitute a substrate onto which atmospheric 10 constituents can deposit and undergo photochemical and oxidative processing, giving rise to “urban grime” films. HNO3 and N2O5 are important sinks for NOx in the lower atmosphere and may be deposited onto these films, forming nitrate through surface hydrolysis. Although such deposition ...

Interactive comment on “Formation of Reactive Nitrogen Oxides from Urban Grime

It is believed that the deposition of NOy (mainly HNO3, even if N2O5 is also discussed here) is a sink process for NOx, however this study challenges this point of view and demonstrates, for the time, that photochemistry of photochemistry of urban grime is as a potential source of gaseous nitrous acid (HONO). This has been suggested before but never demonstrated. This study therefore a nice pie...

Interactive comment on “Formation of Reactive Nitrogen Oxides from Urban Grime Photochemistry” by A. M. Baergen and D. J. Donaldson

Manuscript by Alyson Baergen and D. J. Donaldson focuses on formation of HONO, a key chemical species and/or reaction intermediate in atmospheric chemistry, during photolysis of urban grime. Given the fact that sources and formation of daytime HONO in urban setup are poorly understood, this study reveals potential chemical and photochemical reaction pathways and mechanisms to yield HONO. The kn...

A Reactivity Based Emission Inventory for the South Pars and Its Implication for Ozone Pollution Control

The South Pars zone in Iran encompasses the largest gas refineries and petrochemical complexes in the world. In the South Pars zone, elevated concentrations of reactive hydrocarbons co-emitted with nitrogen oxides from industrial facilities lead to substantial ozone production downwind. To understand the role of these emissions on the ozone formation and, to formulate appropriate control st...

Wavelength Dependence of Nitrate Photochemistry on Mineral Dust Introduction Mineral dust aerosol in the atmosphere provide reactive surfaces for heterogeneous reactions of nitrogen oxides