IMPLEMENTATION OF NOx AND O3 KEY SOURCE TRACING METHOD
IN A REGIONAL CHEMICAL TRANSPORT MODEL
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Abstract
NOx and O3 key source tracing method was implemented in a regional chemical transport model with meteorological fields provided by the mesoscale model MM5. In t his paper we introduce this tracing method as well as the model to which it is a pplied in detail. The concentration equations for the traced species are describ ed in combination with an analysis of the ozone photochemical mechanism. This source tracing method was applied to a chemical transport model to investigate th e impacts of near by key pollution sources on the photochemical pollution in Be i jing. As a case study, the temporal and spatial distributions and variations of NOx and O3 due to the surface emission from Taiyuan and Shijiazhuang were si mula ted for a summertime period. It turns out that the distribution patterns of traced NOx, NOz and O3 are in agreement with the analyses of their atmospheric lifetime scales, indicating that this tracing method is a powerful method for studyin g the source and transform of nitrogen oxides and ozone on the regional scale. It is found from the case study that NOx originated from Taiyuan and Shijiazhuang itself cannot be transported into Beijing, however, its derivatives ozone and HNO3 can be transported into Beijing, polluting the urban atmosphere of the city.
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