南京冬季一次重霾污染事件PM_(2.5)区域传输收支分析
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摘要
利用WRF-Chem模式对2015年12月21—23日南京一次重霾污染过程进行模拟.基于合理的模拟评估,采用大气传输通量计算法,着重分析了此次霾污染过程中模拟的南京地区PM_(2.5)的传输收支特征,以及周边地区大气污染物传输对南京市PM_(2.5)变化的贡献.结果表明,此次霾污染过程中,本地源与外来源区域传输共同影响着南京市的空气质量.PM_(2.5)的跨区域传输是此次重霾污染发生和消亡的重要因素.在霾污染事件的形成维持阶段,南京地区是作为周边地区PM_(2.5)的接收区,大气污染物主要由南京的西边界输入,大气污染物的外源输入是南京PM_(2.5)污染的主要贡献来源,占南京PM_(2.5)污染的84%.在霾污染事件的消亡阶段,南京地区则是作为周边地区PM_(2.5)的源,大气污染物主要由南京的东边界持续向外输出.
The WRF-Chem model was used to simulate a process of heavy haze pollution in Nanjing from December 21 to 23, 2015.Based on a reasonable simulation assessment, the transport and budget of PM_(2.5) simulated in Nanjing during this process were analyzed by calculating air pollutant transport fluxes to estimate the contribution of air pollutant transport from surrounding regions to the changes of PM_(2.5) in Nanjing. The results showed that both local air pollutant emissions and regional transport of external pollution sources jointly affected the air quality of Nanjing in this process of haze. The regional transport of PM_(2.5) is an important factor controlling the process of this heavy haze pollution. During the formation and maintenance stages of the haze event, Nanjing is as the receptor area of PM_(2.5) from the surrounding regions, and the air pollutants are mainly imported from the west border of Nanjing with the import of air pollutants accounting for 84% of the PM_(2.5) pollution in Nanjing. During the disappearance stage of haze event, Nanjing is the source of PM_(2.5) emission for the surrounding areas, and air pollutants are mainly exported continuously from the east border of Nanjing.
The WRF-Chem model was used to simulate a process of heavy haze pollution in Nanjing from December 21 to 23, 2015.Based on a reasonable simulation assessment, the transport and budget of PM_(2.5) simulated in Nanjing during this process were analyzed by calculating air pollutant transport fluxes to estimate the contribution of air pollutant transport from surrounding regions to the changes of PM_(2.5) in Nanjing. The results showed that both local air pollutant emissions and regional transport of external pollution sources jointly affected the air quality of Nanjing in this process of haze. The regional transport of PM_(2.5) is an important factor controlling the process of this heavy haze pollution. During the formation and maintenance stages of the haze event, Nanjing is as the receptor area of PM_(2.5) from the surrounding regions, and the air pollutants are mainly imported from the west border of Nanjing with the import of air pollutants accounting for 84% of the PM_(2.5) pollution in Nanjing. During the disappearance stage of haze event, Nanjing is the source of PM_(2.5) emission for the surrounding areas, and air pollutants are mainly exported continuously from the east border of Nanjing.
引文
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胡燕,周家斌,熊鹰,等.2017.武汉市典型地区PM2.5化学组成及来源解析[J].环境污染与防治,39(9):992-998
Jiang C.2015.Modeling study of PM2.5 pollutant transport across cities in China′s Jing-Jin-Ji region during a severe haze episode in December 2013[J].Atmospheric Chemistry & Physics Discussions,15(3):3745-3776
蒋永成.2015.海峡西岸地区大气复合污染变化和区域传输特征研究[D].南京:南京信息工程大学
Lang J.2013.A Monitoring and modeling study to investigate regional transport and characteristics of PM2.5 pollution[J].Aerosol & Air Quality Research,13(3):943-956
Lin J,An J,Qu Y,et al.2016.Local and distant source contributions to secondary organic aerosol in the Beijing urban area in summer[J].Atmospheric Environment,124:176-185
Li P.2015.Reinstate regional transport of PM2.5 as a major cause of severe haze in Beijing[J].Proceedings of the National Academy of Sciences of the United States of America,112(21):E2739
李恬,王宏,赵天良,等. 2016.山东一次PM2.5污染过程的模拟特征[J].气候与环境研究, 21(3):313-322
王杨君,李莉,冯加良,等.2014.基于OSAT方法对上海2010年夏季臭氧源解析的数值模拟研究[J].环境科学学报,34(3):567-573
魏建苏,孙燕,严文莲,等.2010.南京霾天气的特征分析和影响因子初探[J].气象科学,30(6):868-873
徐祥德,周丽,周秀骥,等.2004.城市环境大气重污染过程周边源影响域[J].中国科学:D辑,34(10):958-966
Wang Y J.2014.Source apportionment of fine particulate matter during autumn haze episodes in Shanghai,China[J].Journal of Geophysical Research Atmospheres,119(4):1903 -1914
Wu D W.2013.A study of control policy in the Pearl River Delta region by using the particulate matter source apportionment method[J].Atmospheric Environment, 76(76):147-161
于兴娜.2013.南京北郊2011年春季气溶胶粒子的散射特征[J].大气科学学报,36(3):354-360
Žabkar R.2015.Evaluation of the high resolution WRF-Chem (v3.4.1) air quality forecast and its comparison with statistical ozone predictions[J].Geoscientific Model Development,8(2):1029-1075
张蓬勃,金琼,陆晓波,等. 2016. 2013年1月持续性霾天气中影响污染程度的气象条件分析[J].气象科学, 36(1):112-120
张英杰,赵天良,韩永翔, 等.2015.大气污染物周边源对2014南京青奥会空气质量影响的预估分析[J].中国粉体技术,21(1):16-21
郑秋萍,刘红年,唐丽娟,等.2013.苏州灰霾特征分析[J].气象科学,33(1):83-88
庄欣,黄晓锋,陈多宏,等.2017.珠江三角洲PM2.5高污染天气的区域污染特征分析[J].环境污染与防治, 39(10):1088-1091
朱彬,苏继锋,韩志伟,等.2010.秸秆焚烧导致南京及周边地区一次严重空气污染过程的分析[J].中国环境科学,30(5):585-592
朱莉莉,晏平仲,王自发, 等.2015.江苏省级区域空气质量数值预报模式效果评估[J].中国环境监测,31(2):17-23