新冠肺炎疫情期间南京市PM2.5中碳质组分污染特征分析

doi:10.19741/j.issn.1673-4831.2020.0857

摘要/Abstract

摘要： 为掌握新冠肺炎疫情爆发前后南京市城区细大气细颗粒物（PM_2.5）中有机碳（OC）和元素碳（EC）的浓度变化特征，于2020年1-2月期间在南京市主城区在线监测了PM_2.5、OC、EC浓度及气象要素。与应急响应前相比，应急响应启动后PM_2.5浓度下降了41.2%，EC浓度下降了57.9%，而OC浓度不降反增，表明停工停产显著降低了PM_2.5和EC浓度，但对OC浓度变化影响较小。在应急响应前，OC和EC浓度均呈现白天浓度低、清晨及傍晚浓度高的日变化规律；在应急响应后，EC浓度日变化不大且维持在较低水平，OC浓度呈现午后浓度低、午前和傍晚浓度高的变化规律。PM_2.5浓度在应急响应后的大幅减少导致光照辐射强度提升，有利于光化学反应生成二次有机碳（SOC）。在PM_2.5和EC浓度下降的形势下SOC浓度不降反增，同时OC与EC的相关性显著降低。

关键词: 新冠肺炎疫情, PM_2.5, 碳组分, 有机碳, 元素碳

Abstract: In order to explore the variations of carbon components[including organic carbon (OC) and element carbon (EC)] in PM_2.5 at the urban area of Nanjing during the breakout of COVID-19 period, PM_2.5, OC and EC mass concentrations were measured by online monitoring from January to February 2020. Compared to the concentrations before the emergency response, the PM_2.5 concentration after the emergency response was reduced by 41.2% and EC reduced by 57.9%. These results indicate that the shutdown significantly reduced PM_2.5 and EC concentrations, but the OC concentration increased. Before the emergency response, the OC and EC concentrations were low in daytime and high at night and early morning. After the emergency response, the average concentration of EC only had a slight change within a day and maintained at low concentration level, OC showed a curve trend which was higher in the afternoon and lower in morning and evening. The significant decrease of PM_2.5 concentration after the emergency response period led to the increasing of light radiation intensity, which promoted the formation of secondary organic carbon (SOC). The SOC concentration increased when the PM_2.5 and EC concentrations decreased, and the correlation between OC and EC also decreased significantly.

Key words: COVID-19 pandemic, PM_2.5, carbon component, organic carbon, elemental carbon

中图分类号:

X823

纪源, 赵秋月, 陈凤, 陈东. 新冠肺炎疫情期间南京市PM_2.5中碳质组分污染特征分析[J]. 生态与农村环境学报, 2021, 37(8): 992-1000.

JI Yuan, ZHAO Qiu-yue, CHEN Feng, CHEN Dong. Characteristics of Carbonaceous Aerosols in Ambient PM_2.5 During the COVID-19 Period in Nanjing[J]. Journal of Ecology and Rural Environment, 2021, 37(8): 992-1000.

参考文献

[1] JIMENEZ J L, CANAGARATNA M R, DONAHUE N M, et al. Evolution of Organic Aerosols in the Atmosphere[J]. Science, 2009, 326(5959):1525-1529.
[2] 丁峰, 朱志锋, 陆晓波, 等. 2014-2018年南京PM_2.5中碳组分污染特征分析[J]. 中国环境监测, 2020, 36(2):165-172. [DING Feng, ZHU Zhi-feng, LU Xiao-bo, et al. Characteristics Analysis of Carbon Components in PM_2.5 in Nanjing from 2014 to 2018[J]. Environmental Monitoring in China, 2020, 36(2):165-172.]
[3] 段凤魁, 贺克斌, 刘咸德, 等. 含碳气溶胶研究进展:有机碳和元素碳[J]. 环境工程学报, 2007, 1(8):1-8. [DUAN Feng-kui, HE Ke-bin, LIU Xian-de, et al. Review of Carbonaceous Aerosol Studies:Organic Carbon and Elemental Carbon[J]. Chinese Journal of Environmental Engineering, 2007, 1(8):1-8.]
[4] 张蕾, 姬亚芹, 张军, 等. 盘锦市秋冬季节PM_2.5中碳组分特征及来源解析[J]. 环境科学, 2018, 39(7):3051-3056.
[5] 董海燕, 古金霞, 陈魁, 等. 天津市区PM_2.5中碳组分污染特征及来源分析[J]. 中国环境监测, 2013, 29(1):34-38. [DONG Hai-yan, GU Jin-xia, CHEN Kui, et al. Character and Source Analysis of Carbonaceous Aerosol in PM_2.5 in the Center of Tianjin City[J]. Environmental Monitoring in China, 2013, 29(1):34-38.]
[6] 黄炯丽, 陈志明, 莫招育, 等. 广西玉林市大气PM₁₀和PM_2.5中有机碳和元素碳污染特征分析[J]. 环境科学, 2018, 39(1):27-37. [HUANG Jiong-li, CHEN Zhi-ming, MO Zhao-yu, et al. Characteristics of Organic and Elemental Carbon in PM₁₀ and PM_2.5 in Yulin City, Guangxi[J]. Environmental Science, 2018, 39(1):27-37.]
[7] CAO J J, LEE S C, HO K F, et al. Spatial and Seasonal Variations of Atmospheric Organic Carbon and Elemental Carbon in Pearl River Delta Region, China[J]. Atmospheric Environment, 2004, 38(27):4447-4456.
[8] 罗达通, 张敬巧, 刘湛, 等. 郴州市大气PM_2.5碳组分污染特征及其来源分析[J]. 环境科学研究, 2018, 31(11):1858-1866. [LUO Da-tong, ZHANG Jing-qiao, LIU Zhan, et al. Characteristics and Sources of Carbonaceous Species in Atmospheric PM_2.5 in Chenzhou City[J]. Research of Environmental Sciences, 2018, 31(11):1858-1866.]
[9] CHAN Y C, SIMPSON R W, MCTAINSH G H, et al. Source Apportionment of Visibility Degradation Problems in Brisbane (Australia) Using the Multiple Linear Regression Techniques[J]. Atmospheric Environment, 1999, 33(19):3237-3250.
[10] KIRKEVÅG A, IVERSEN T, DAHLBACK A.On Radiative Effects of Black Carbon and Sulphate Aerosols[J]. Atmospheric Environment, 1999, 33(17):2621-2635.
[11] 张晓雨, 赵欣, 应蓉蓉, 等. 广州大气PM_2.5中含碳组分的污染特征及来源解析[J]. 生态与农村环境学报, 2018, 34(7):659-666. [ZHANG Xiao-yu, ZHAO Xin, YING Rong-rong, et al. Characteristics and Source Apportionments of Carbonaceous Components in Atmospheric Fine Particles in Guangzhou[J]. Journal of Ecology and Rural Environment, 2018, 34(7):659-666.]
[12] KIM K H, SEKIGUCHI K, FURUUCHI M, et al. Seasonal Variation of Carbonaceous and Ionic Components in Ultrafine and Fine Particles in an Urban Area of Japan[J]. Atmospheric Environment, 2011, 45(8):1581-1590.
[13] QIN Y J, KIM E, HOPKE P K.The Concentrations and Sources of PM_2.5 in Metropolitan New York City[J]. Atmospheric Environment, 2006, 40:312-332.
[14] CAO J J, LEE S C, CHOW J C, et al. Spatial and Seasonal Distributions of Carbonaceous Aerosols over China[J]. Journal of Geophysical Research:Atmospheres, 2007, 112(D22):D22S11.
[15] XU S G, CHOW J C, WATSON J, et al. Emissions of Air Pollutants from Household Stoves:Honeycomb Coal Versus Coal Cake[J]. Environmental Science & Technology, 2004, 38(17):4612-4618.
[16] LU Z, STREETS D G, ZHANG Q, et al. Sulfur Dioxide Emissions in China and Sulfur Trends in East Asia since 2000[J]. Atmospheric Chemistry and Physics, 2010, 10(13):6311-6331.
[17] 江琪, 桂海林, 徐冉.2020年1月大气环流和天气分析[J]. 气象, 2020, 46(4):575-580. [JIANG Qi, GUI Hai-lin, XU Ran.Analysis of January 2020 Atmospheric Circulation and Weather[J]. Meteorological Monthly, 2020, 46(4):575-580.]
[18] 曹爽, 何立富, 沈晓琳, 等. 2020年2月大气环流和天气分析[J]. 气象, 2020, 46(5):725-732. [CAO Shuang, HE Li-fu, SHEN Xiao-lin, et al. Analysis of the February 2020 Atmospheric Circulation and Weather[J]. Meteorological Monthly, 2020, 46(5):725-732.]
[19] CHEN D, CUI H F, ZHAO Y, et al. A Two-Year Study of Carbonaceous Aerosols in Ambient PM_2.5 at a Regional Background Site for Western Yangtze River Delta, China[J]. Atmospheric Research, 2017, 183:351-361.
[20] 薛国强, 朱彬, 王红磊.南京市大气颗粒物中水溶性离子的粒径分布和来源解析[J]. 环境科学, 2014, 35(5):1633-1643. [XUE Guo-qiang, ZHU Bin, WANG Hong-lei.Size Distributions and Source Apportionment of Soluble Ions in Aerosol in Nanjing[J]. Environmental Science, 2014, 35(5):1633-1643.]
[21] 康晖, 朱彬, 王红磊, 等. 长三角典型站点冬季大气PM_2.5中OC、EC污染特征[J]. 环境科学, 2018, 39(3):961-971. [KANG Hui, ZHU Bin, WANG Hong-lei, et al. Characterization and Variation of Organic Carbon(OC) and Elemental Carbon(EC) in PM_2.5 during the Winter in the Yangtze River Delta Region, China[J]. Environmental Science, 2018, 39(3):961-971.]
[22] 张雷波, 王荫荫, 李敏姣, 等. 天津市2020年1季度新冠肺炎疫情发生前后PM_2.5排放特征研究[J]. 低碳世界, 2020, 10(6):14-15.
[23] 姜文娟, 郭照冰, 刘凤玲, 等. 南京地区大气PM_1.1中OC、EC特征及来源解析[J]. 环境科学, 2015, 36(3):774-779. [JIANG Wen-juan, GUO Zhao-bing, LIU Feng-ling, et al. Characteristics and Sources Apportionment of OC and EC in PM_1.1 from Nanjing[J]. Environmental Science, 2015, 36(3):774-779.]
[24] 段卿, 安俊琳, 王红磊, 等. 南京北郊夏季大气颗粒物中有机碳和元素碳的污染特征[J]. 环境科学, 2014, 35(7):2460-2467. [DUAN Qing, AN Jun-lin, WANG Hong-lei, et al. Pollution Characteristics of Organic and Elemental Carbon in Atmospheric Particles in Nanjing Northern Suburb in Summer[J]. Environmental Science, 2014, 35(7):2460-2467.]
[25] TURPIN B J, HUNTZICKER J J.Identification of Secondary Organic Aerosol Episodes and Quantitation of Primary and Secondary Organic Aerosol Concentrations during SCAQS[J]. Atmospheric Environment, 1995, 29(23):3527-3544.
[26] 张大宇, 刘效峰, 彭林, 等. 太原市PM_2.5中含碳气溶胶特征分析[J]. 环境化学, 2019, 38(12):2719-2727. [ZHANG Da-yu, LIU Xiao-feng, PENG Lin, et al. Analysis of Characteristics of Carbonaceous Aerosols in PM_2.5 of Taiyuan[J]. Environmental Chemistry, 2019, 38(12):2719-2727.]
[27] 刘珊, 彭林, 温彦平, 等. 太原市PM_2.5中有机碳和元素碳的污染特征[J]. 环境科学, 2015, 36(2):396-401. [LIU Shan, PENG Lin, WEN Yan-ping, et al. Pollution Characteristics of Organic and Elemental Carbon in PM_2.5 in Taiyuan[J]. Environmental Science, 2015, 36(2):396-401.]
[28] 杨健, 丁祥, 刘寅, 等. 高原城市昆明PM_2.5中碳组分污染特征及来源分析[J]. 环境化学, 2017, 36(2):257-264. [YANG Jian, DING Xiang, LIU Yin, et al. Characteristics and Source Analysis of Carbonaceous Components in PM_2.5 at a Plateau City, Kunming[J]. Environmental Chemistry, 2017, 36(2):257-264.]
[29] 成海容, 王祖武, 冯家良, 等. 武汉市城区大气PM_2.5的碳组分与源解析[J]. 生态环境学报, 2012, 21(9):1574-1579. [CHENG Hai-rong, WANG Zu-wu, FENG Jia-liang, et al. Carbonaceous Species Composition and Source Apportionment of PM_2.5 in Urban Atmosphere of Wuhan[J]. Ecology and Environmental Sciences, 2012, 21(9):1574-1579.]
[30] 吴梦龙, 郭照冰, 刘凤玲, 等. 南京市PM_2.1中有机碳和元素碳污染特征及影响因素[J]. 中国环境科学, 2013, 33(7):1160-1166. [WU Meng-long, GUO Zhao-bing, LIU Feng-ling, et al. Pollution Characteristics and Influencing Factors of Organic and Elemental Carbon in PM_2.1 in Nanjing[J]. China Environmental Science, 2013, 33(7):1160-1166.]
[31] 索娜卓嘎, 谭丽, 周芮平, 等. 采暖期北京大气PM_2.5中碳组分的分布特征及来源解析[J]. 中国环境监测, 2018, 34(4):54-59. [SUONAZHUOGA, TAN Li, ZHOU Rui-ping, et al. Distribution Characteristics and Sources Apportionment of Carbonaceous Components in PM_2.5 during the Heating Periods in Beijing[J]. Environmental Monitoring in China, 2018, 34(4):54-59.]
[32] CHOW J C, WATSON J G, LU Z Q, et al. Descriptive Analysis of PM_2.5 and PM₁₀ at Regionally Representative Locations during SJVAQS/AUSPEX[J]. Atmospheric Environment, 1996, 30(12):2079-2112.
[33] TURPIN B J, HUNTZICKER J J.Secondary Formation of Organic Aerosol in the Los Angeles Basin:A Descriptive Analysis of Organic and Elemental Carbon Concentrations[J]. Atmospheric Environment:Part A General Topics, 1991, 25(2):207-215.