科研之友
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摘要
In the past decade, ozone (O-3) pollution has been continuously worsening in most developing countries. The accurate identification of the nonlinear relationship between O-3 and its precursors is a prerequisite for formulating effective O-3 control measures. At present, precursor-based O-3 isopleth diagrams are widely used to infer O-3 control strategy at a particular location. However, there is frequently a large gap between the O-3 -precursor nonlinearity delineated by the O-3 isopleths and the emission source control measures to reduce O-3 levels. Consequently, we developed an emission source-based O(3 )isopleth diagram that directly illustrates the O-3 level changes in response to synergistic control on two types of emission sources using a validated numerical modeling system and the latest regional emission inventory. Isopleths can be further upgraded to isosurfaces when co-control on three types of emission sources is investigated. Using Guangzhou and Foshan as examples, we demonstrate that similar precursor-based O-3 isopleths can be associated with significantly different emission source co-control strategies. In Guangzhou, controlling solvent use emissions was the most effective approach to reduce peak O-3 levels. In Foshan, co-control of on-road mobile, solvent use, and fixed combustion sources with a ratio of 3:1:2 or 3:1:3 was best to effectively reduce the peak O-3 levels below 145 ppbv. This study underscores the importance of using emission source-based O-3 isopleths and isosurface diagrams to guide a precursor emission control strategy that can effectively reduce the peak O-3 levels in a particular area.
