NOx lifetimes and emissions of cities and power plants in polluted background estimated by satellite observations
Item
Title (Dublin Core)
NOx lifetimes and emissions of cities and power plants in polluted background estimated by satellite observations
Description (Dublin Core)
We present a new method to quantify NO<sub><i>x</i></sub> emissions and corresponding atmospheric lifetimes from OMI NO<sub>2</sub> observations together with ECMWF wind fields without further model input for sources located in a polluted background. NO<sub>2</sub> patterns under calm wind conditions are used as proxy for the spatial patterns of NO<sub><i>x</i></sub> emissions, and the effective atmospheric NO<sub><i>x</i></sub> lifetime is determined from the change of spatial patterns measured at larger wind speeds. Emissions are subsequently derived from the NO<sub>2</sub> mass above the background, integrated around the source of interest. <br><br> Lifetimes and emissions are estimated for 17 power plants and 53 cities located in non-mountainous regions across China and the USA. The derived lifetimes for the ozone season (May–September) are 3.8 ± 1.0 h (mean ± standard deviation) with a range of 1.8 to 7.5 h. The derived NO<sub><i>x</i></sub> emissions show generally good agreement with bottom-up inventories for power plants and cities. Regional inventory shows better agreement with top-down estimates for Chinese cities compared to global inventory, most likely due to different downscaling approaches adopted in the two inventories.
Creator (Dublin Core)
Liu, Fei
Beirle, Steffen
Zhang, Qiang
Dörner, Steffen
He, Kebin
Wagner, Thomas
Date (Dublin Core)
2018-09-17
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-16-5283-2016
https://acp.copernicus.org/articles/16/5283/2016/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
