Ozone source apportionment (OSAT) to differentiate local regional and super-regional source contributions in the Pearl River Delta region, China
Ozone source apportionment (OSAT) to differentiate local regional and super-regional source contributions in the Pearl River Delta region, China
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DOI：
10.1029/2011jd017340
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发表时间：
2012-08-04
影响因子：
4.4
通讯作者：
Louie, P. K. K.
中科院分区：
文献类型：
--
作者：
Li, Y.;Lau, A. K. -H.;Louie, P. K. K.
众所周知，地面臭氧不仅是一个地区性或地区性的空气质量问题；超区域(珠三角地区以外的源)的排放源对当地的臭氧浓度有很大影响。然而，区分本地、区域和超区域臭氧前体的相对贡献的来源解析研究仍然有限。本文以珠江三角洲为例，利用光化学模式源解析工具，对地表臭氧进行了详细的源分类和源区解析研究。我们的结果表明，虽然在平均臭氧条件下，超区域贡献占主导地位，但局地和区域源的增加是形成高臭氧事件的原因。特别值得一提的是，本地和珠江三角洲地区的贡献率在秋季(2006年11月)非臭氧时段约为30%，在臭氧高峰期(2006年11月)增至约50%，在夏季(2006年7月)臭氧高峰期更高达约70%。这些结果表明，对臭氧前体的地方和区域控制对于减少臭氧仍然非常重要，特别是对于偶发事件。此外，我们的结果显示，流动排放是迄今为止对珠江三角洲臭氧水平贡献最大的臭氧事件。此外，我们发现邻近地区的臭氧前体对任何一个城市的臭氧水平的影响方式存在很大的季节性差异，这表明区域合作对于制定有效的长期策略以减少珠江三角洲地区的臭氧水平非常重要。
It is well-known that ground-level ozone is not just a local or regional air quality problem; emission sources from super-regional (sources outside the PRD region) scales are known to contribute significantly to local ozone concentrations. However, source apportionment studies differentiating the relative contributions of local, regional, and super-regional ozone precursors are still limited. In this paper, using the Pearl River Delta (PRD) as an example, we have conducted a detailed apportionment (by source categories and by source regions) study of surface ozone using photochemical model source apportionment tools. Our results show that, while the super-regional contribution is dominant under mean ozone conditions, elevated local and regional sources are the causative factor for the formation of high ozone episodes. In particular, the local and PRD regional contributions increase from about 30% during non-episode days to about 50% during high ozone episode days in the autumn (November 2006) and even up to about 70% during high ozone episodes in the summer (July 2006). These results suggest that local and regional controls of ozone precursors are still very important for ozone reduction, particularly for episodic events. Furthermore, our results show that mobile emission is by far the highest contributing source category to ozone levels in the PRD for episodic ozone events. Moreover, we find substantial seasonal variations in the way ozone precursors from neighboring areas affect ozone levels in any particular city, suggesting that regional collaborations are important for developing effective long-term strategies to reduce ozone over the PRD region.