NO2 photolysis frequencies in street canyons
Item
Title (Dublin Core)
NO2 photolysis frequencies in street canyons
Description (Dublin Core)
Photolysis frequencies for NO<sub>2</sub> are modeled for the conditions in urban streets, which are taken into account as canyons with variable height and width. The effect of a street canyon is presented with absolute values and as a ratio <i>RJ</i> of the photolysis frequency within the street compared to that with free horizon. This allows further use of the existing photolysis parameterizations. Values are presented for variable solar elevation and azimuth angles, varying atmospheric conditions and different street properties. The NO<sub>2</sub> photolysis frequency in a street depends strongly on the relative width of the street and its orientation towards the sun. Averaged over atmospheric conditions and street orientation, the NO<sub>2</sub> photolysis frequency is reduced in comparison with the values for free horizon: to less than 20% for narrow skyscraper streets, to about 40% for typical urban streets, and only to about 80% for garden streets. A parameterization with the global solar irradiance is given for the averaged <i>RJ</i> values.
Creator (Dublin Core)
Koepke, P.
Garhammer, M.
Hess, M.
Roeth, E.-P.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-10-7457-2010
https://acp.copernicus.org/articles/10/7457/2010/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
