NOx Emission Reduction and its Effects on Ozone during the 2008 Olympic Games

作者：Yang Qing^*; Wang Yuhang; Zhao Chun; Liu Zhen; Gustafson William I Jr; Shao Min

来源：Environmental Science & Technology, 2011, 45(15): 6404-6410.

DOI：10.1021/es200675v

We applied a daily assimilated inversion method to estimate NOx (NO + NO2) emissions for June-September 2007 and 2008 cm the basis of the Aura Ozone Monitoring Instrument (OMI) observations of nitrogen dioxide (NO2) and model simulations using the Regional chemistry and transport Model (REAM). This method allows for estimating emission changes with a finer temporal resolution than previous studies and shows that the progression of the emission reduction corresponds roughly to the scheduled implementation of emission controls over Beijing. OMI column NO2 reductions are approximately 45%, 33%, and 14% over urban Beijing, rural Beijing, and the Huabei Plain, respectively, while the corresponding anthropogenic NO, emission reductions are only 28%, 24%, and 6%, during the full emission control period (July 20-Sep 20, 2008). Meteorological changes from summer 2007 to 2008 are the main factor contributing to the column NO2 decreases not accounted for by the emission reduction. The surface ozone changes due to NOx emission reduction are negligible using a standard VOC emission inventory. When using enhanced VOC (particularly aromatics) emissions derived from in situ observations, urban Beijing shifted O-3 production from the VOC-limited regime toward the NOx-limited regime resulting in a more substantial ozone decrease (up to 10 ppbv).

• 出版日期2011-8-1
• 单位北京大学