广东省臭氧污染特征及其来源解析研究

使用广东省近年大范围长期连续臭氧观测数据分析了珠三角与广东省的臭氧污染特征,并使用NAQPMS模型研究了广东省与典型城市不同季节的臭氧来源情况.结果表明:2014—2016年广东省的臭氧污染局部在改善.珠三角的臭氧浓度水平总体高于粤东西北地区,广东省臭氧总体上呈现出珠三角中南部和粤东东部部分地区较高、粤西污染相对较轻的分布态势.广东省的臭氧夏秋季浓度较高,冬春季浓度较低.广东省臭氧主要来源于本地排放,夏季占比为57%,其余季节约占40%,臭氧的跨省输送特征明显.珠三角西南部春夏季臭氧本地贡献约为50%,但秋冬季仅占19%~28%.若要减轻广东的臭氧污染,建议实施臭氧消峰行动,即在夏秋季节严控珠三角地区的臭氧前体物排放,特别是珠三角中部广州、佛山与东莞等城市的排放要重点控制.同时,强化粤东西北地区与周边省份的协同减排.

Study on ozone pollution characteristics and source apportionment in Guangdong Province

The spatio-temporal characteristics of ozone pollution in both PRD region and Guangdong Province are analyzed by using long-term monitoring data from air quality monitoring network of Guangdong Province from 2006 to 2016. Ozone source apportionment in four seasons at Guangdong Province and its typical cities was also conducted via the NAQPMS numerical model. Results showed that the ozone mitigation in some of the Guangdong Province has been observed since 2013. In Guangdong Province, the PRD region has the highest ozone levels than other areas. The most severe ozone pollution was observed in the southern part of central PRD and the eastern area, while a relatively better situation was observed in western area. Ozone concentrations were higher in both summer and autumn while lower in winter and spring. On average, ozone pollution in Guangdong Province was mainly contributed by local emissions with a contribution of 57% in summer and 40% in other seasons, which mainly constitute of the transport contribution from adjacent provinces. For the PRD region, local emission contribution to ozone in south-west area in spring and summer was about 50%, while the contributions in autumn and winter were only about 19%~28%. To mitigate the ozone pollution in Guangdong province, especially the ozone peaks, controlling the emission amount of its precursor in Central Guangzhou, Foshan, and Dongguan is strongly recommended to carry out with a joint emission control in other Guangdong and the adjacent provinces.