Formation of reactive nitrogen oxides from urban grime photochemistry
Item
Title (Dublin Core)
Formation of reactive nitrogen oxides from urban grime photochemistry
Description (Dublin Core)
Impervious surfaces are ubiquitous in urban environments and constitute a substrate onto which atmospheric constituents can deposit and undergo photochemical and oxidative processing, giving rise to “urban grime” films. HNO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> are important sinks for NO<sub><i>x</i></sub> in the lower atmosphere and may be deposited onto these films, forming nitrate through surface hydrolysis. Although such deposition has been considered as a net loss of NO<sub><i>x</i></sub> from the atmosphere, there is increasing evidence that surface-associated nitrate undergoes further reaction. Here, we examine the gas phase products of the photochemistry of real, field-collected urban grime using incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS). Gas phase nitrogen oxides are emitted upon illumination of grime samples and their production increases with ambient relative humidity (RH) up to 35 % after which the production becomes independent of RH. These results are discussed in the context of water uptake onto and evaporation from grime films.
Creator (Dublin Core)
Baergen, Alyson M.
Donaldson, D. James
Date (Dublin Core)
2018-09-09
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-16-6355-2016
https://acp.copernicus.org/articles/16/6355/2016/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
