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

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• 作者：Qing Yang ; Yuhang Wang ; Chun Zhao ; Zhen Liu ; William I. Gustafson ; Jr. ; Min Shao
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：August 1, 2011
• 年：2011
• 卷：45
• 期：15
• 页码：6404-6410
• 全文大小：875K
• 年卷期：v.45,no.15(August 1, 2011)
• ISSN：1520-5851

文摘

We applied a daily assimilated inversion method to estimate NO_x (NO + NO₂) emissions for June鈥揝eptember 2007 and 2008 on 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_x emission reductions are only 28%, 24%, and 6%, during the full emission control period (July 20鈥揝ep 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 NO_x 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 O₃ production from the VOC-limited regime toward the NO_x-limited regime resulting in a more substantial ozone decrease (up to 10 ppbv).