干旱区生态环境知识资源中心(Arid): Characteristics and sources of fine organic aerosol over a big semi-arid urban city of western India using HR-ToF-AMS

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DOI	10.1016/j.atmosenv.2019.04.009
	Characteristics and sources of fine organic aerosol over a big semi-arid urban city of western India using HR-ToF-AMS
	Singh, Atinderpal; Satish, Rangu Venkata; Rastogi, Neeraj
通讯作者	Rastogi, Neeraj
来源期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
EISSN	1873-2844
出版年	2019
卷号	208 页码:103-112
英文摘要	Highly time-resolved measurements of non-refractory submicron particulate matter (NR-PM1) were performed using a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) over a big urban city (Ahmedabad, 23.0 degrees N, 72.6 degrees E, 49 m amsl) of western India during the post-monsoon season. All the components of NR-PM1 [i.e., organic aerosol (OA) SO42-, NO3-, NH4+ and Cl-] showed a strong diurnal variation with the overall dominance of OA (58%) in NR-PM1, and the OA composition was found to be a mixture of fresh and aged species. O/C varied from 0.04 to 0.91 whereas, H/C varied from 1.34 to 2.26. A strong diurnal variation in O/C caused a large variability in OM/OC ratio (ranging from 1.2 to 2.3) during the study period, which suggests that a constant conversion factor for OM estimation (from OC) can be a source of large uncertainty in their load assessment over the study region. Furthermore, the observed slope (-0.78 +/- 0.01) of Van Krevelen (VK) diagram suggests that plausible major functional groups of ambient oxidized OA could be the mixture of alcohols and carboxylic groups. Further, a drastic change in NR-PM1 concentrations and composition was observed during Diwali, a festival when huge amount of firecrackers are burnt across India. Three distinct sources of OA [i.e., primary OA (POA), semi-volatile oxygenated OA (SV-OOA), and low volatility OOA (LV-OOA)] were identified via positive matrix factorization (PMF) analysis. The OA mass was dominated by POA (42%), followed by LV-OOA (33%) and SV-OOA (25%). Diurnal variations in PMF factors suggest that OOA (SV-OOA + LV-OOA) were high during early morning and afternoon hours; whereas, POA was most abundant during traffic rush hours. Observations also revealed that the high OA loading events were dominated by POA during the study period. This study provides new insights on the atmospheric aging of OA, for the first time, over western India, which would be helpful in understanding the formation mechanism of secondary OA over this region.
英文关键词	Organic aerosol Elemental ratios Primary and secondary aerosol
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000467661500010
WOS关键词	POSITIVE MATRIX FACTORIZATION ; REAL-TIME MEASUREMENTS ; MASS-SPECTROMETRY ; CHEMICAL-CHARACTERIZATION ; AMBIENT AEROSOLS ; CHINA INSIGHTS ; MEXICO-CITY ; SITE ; WINTER ; PARTICLES
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214500
作者单位	Phys Res Lab, Geosci Div, Ahmadabad, Gujarat, India
推荐引用方式 GB/T 7714	Singh, Atinderpal,Satish, Rangu Venkata,Rastogi, Neeraj. Characteristics and sources of fine organic aerosol over a big semi-arid urban city of western India using HR-ToF-AMS[J],2019,208:103-112.
APA	Singh, Atinderpal,Satish, Rangu Venkata,&Rastogi, Neeraj.(2019).Characteristics and sources of fine organic aerosol over a big semi-arid urban city of western India using HR-ToF-AMS.ATMOSPHERIC ENVIRONMENT,208,103-112.
MLA	Singh, Atinderpal,et al."Characteristics and sources of fine organic aerosol over a big semi-arid urban city of western India using HR-ToF-AMS".ATMOSPHERIC ENVIRONMENT 208(2019):103-112.