干旱区生态环境知识资源中心(Arid): Contrasting Aerosol Optical Characteristics and Source Regions During Summer and Winter Pollution Episodes in Nanjing, China

Arid

DOI	10.3390/rs11141696
	Contrasting Aerosol Optical Characteristics and Source Regions During Summer and Winter Pollution Episodes in Nanjing, China
	Wang, Jing 1; de Leeuw, Gerrit 1,2; Niu, Shengjie 1; Kang, Hanqing 1
通讯作者	Wang, Jing
来源期刊	REMOTE SENSING
ISSN	2072-4292
出版年	2019
卷号	11 期号:14
英文摘要	Two episodes with heavy air pollution in Nanjing, China, one in the summer and another one in the winter of 2017, were selected to study aerosol properties using sun photometer and ground-based measurements, together with source region analysis. The aerosol properties, the meteorological conditions, and the source regions during these two episodes were very different. The episodes were selected based on the air quality index (AQI), which reached a maximum value of 193 during the summer episode (26 May-3 June) and 304 during the winter episode (21-31 December). The particulate matter (PM) concentrations during the winter episode reached maximum values for PM2.5/10 of 254 mu g m(-3) and 345 mu g m(-3), much higher than those during the summer (73 and 185 mu g m(-3)). In contrast, the value of aerosol optical depth (AOD) at 500 nm was higher during the summer episode (2.52 +/- 0.19) than during that in the winter (1.38 +/- 0.18). A high AOD value does not necessarily correspond to a high PM concentration but is also affected by factors, such as wind, Planetary Boundary Layer Height (PBLH), and relative humidity. The mean value of the angstrom ngstrom Exponent (AE) varied from 0.91-1.42, suggesting that the aerosol is a mixture of invaded dust and black carbon. The absorption was stronger during the summer than during the winter, with a minimum value of the single scattering albedo (SSA) at 440 nm of 0.86 on 28 May. Low values of asymmetry factor (ASY) (0.65 at 440 nm and 0.58 at 1020 nm) suggest a large number of anthropogenic aerosols, which are absorbing fine-mode particles. The Imaginary part of the Refractive Index (IRI) was higher during the summer than during the winter, indicating there was absorbing aerosol during the summer. These differences in aerosol properties during the summer and winter episodes are discussed in terms of meteorological conditions and transport. The extreme values of PM and AOD were reached during both episodes in conditions with stable atmospheric stratification and low surface wind speed, which are conducive for the accumulation of pollutants. Potential source contribution function (PSCF) and concentration weighted trajectory (CWT) analysis show that fine mode absorbing aerosols dominate during the summer season, mainly due to emissions of local and near-by sources. In the winter, part of the air masses was arriving from arid/semi-arid regions (Shaanxi, Ningxia, Gansu, and Inner Mongolia provinces) covering long distances and transporting coarse particles to the study area, which increased the scattering characteristics of aerosols.
英文关键词	aerosol optical property sun photometer air quality potential source Nanjing
类型	Article
语种	英语
国家	Peoples R China ; Finland
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000480527800066
WOS关键词	YANGTZE-RIVER DELTA ; AIR-QUALITY ; ATMOSPHERIC AEROSOL ; RELATIVE-HUMIDITY ; PARTICULATE POLLUTION ; OMI OBSERVATIONS ; SEVERE HAZE ; HEAVY HAZE ; 2 DECADES ; DEPTH
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构	南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218393
作者单位	1.Nanjing Univ Informat Sci & Technol, Joint Int Res Lab Climate & Environm Change ILCEC, Key Lab Aerosol Cloud Precipitat, Minist Educ KLME,CIC FEMD,China Meteorol Adm,Key, Nanjing 210044, Jiangsu, Peoples R China; 2.FMI, Climate Res Programme, FI-00101 Helsinki, Finland
推荐引用方式 GB/T 7714	Wang, Jing,de Leeuw, Gerrit,Niu, Shengjie,et al. Contrasting Aerosol Optical Characteristics and Source Regions During Summer and Winter Pollution Episodes in Nanjing, China[J]. 南京信息工程大学,2019,11(14).
APA	Wang, Jing,de Leeuw, Gerrit,Niu, Shengjie,&Kang, Hanqing.(2019).Contrasting Aerosol Optical Characteristics and Source Regions During Summer and Winter Pollution Episodes in Nanjing, China.REMOTE SENSING,11(14).
MLA	Wang, Jing,et al."Contrasting Aerosol Optical Characteristics and Source Regions During Summer and Winter Pollution Episodes in Nanjing, China".REMOTE SENSING 11.14(2019).