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DOI	10.1016/j.atmosenv.2021.118752
	Evolution of size and composition of fine particulate matter in the Delhi megacity during later winter
	Thamban N.M.; Lalchandani V.; Kumar V.; Mishra S.; Bhattu D.; Slowik J.G.; Prevot A.S.H.; Satish R.; Rastogi N.; Tripathi S.N.
发表日期	2021
ISSN	1352-2310
卷号	267
英文摘要	This study presents the first multi-site evolution analysis of fine Organic Aerosols (OA) and inorganics in the Delhi megacity (National Capital Region (NCR)) using high-resolution-particle time of flight (HR-PToF) size distribution obtained from Aerodyne HR-ToF-AMS. It provides a comprehensive view of the atmospheric dynamic processes responsible for the aerosol size and composition transformation. The measurements were performed at two different sampling sites (1) Indian Institute of Technology, Delhi (IITD), and (2) Manav Rachna International University, Faridabad (MRIU) during a late winter period (February to March 2018). Among organics, primary OA (POA) showed particle growth, whereas it was absent in secondary OA proxies. IITD was observed to have a distinct growth pattern as compared to MRIU because of high vehicular density and heterogeneity, and the presence of growth-promoting factors such as acidity and RH conditions. IITD aerosols were observed to be more acidic (ANR∼ 0.75) compared to MRIU (ANR∼1) and showed a distinct diurnal bin-wise increase during the photochemically active period (PAP). Such high acidic conditions are responsible for promoting acid-catalyzed SOA productions over the broader size bins, especially during the PAPs. Primary OA (POA) such as HOA and BBOA proxies show a diurnal growth from ∼440 to 970 nm and from ∼370 to 550 nm, at IITD and from ∼270 to 400 nm and ∼430–470 nm, at MRIU respectively. Further, OA families (amines and hydrocarbons), and inorganics such as chloride and nitrate also showed distinct concurrent diurnal growth patterns at IITD (from an MMDs of ∼380–520 nm to 650–960 nm). We have also observed a positive correlation between OA and inorganics growth and the mass fraction (MF = SOA/OA) of SOA at both sites of NCR. For 0.1 (MF) increase in SOA, the sizes of HOA, chloride, primary CH family and amines (CHN family), and secondary amines (CHON family) are increased by ∼93, 80, 64, 66, and 47 nm at IITD and ∼14, 35, 8, 11, and 16 nm at MRIU respectively. The concurrent growth of these species with the increase in the SOA concentration indicates the existence of a similar size evolution mechanism at both NCR sites, further promoting the formation of internally mixed aerosols during some phase of their evolution. This suggests that condensation is significantly governing the growth mechanism in NCR. Our study indicates the inclusion of such dynamic growth patterns arising from local prevailing conditions into the models for a better understanding of atmospheric aerosol evolution and estimation of fine particulate matter budget. © 2021 Elsevier Ltd
关键词	Composition Evolution HR-PToF Organic aerosol Size
语种	英语
scopus关键词	Aerodynes; Aerosols; Chlorine compounds; Growth rate; Particle size analysis; Evolution; Fine particulate matter; Growth patterns; High resolution; High-resolution-particle time of flight; Indian institute of technologies; National capital regions; Organic aerosol; Size; Time-of flight; Amines; acid; amine; chloride; hydrocarbon; inorganic compound; nitrate; aerosol; megacity; particulate matter; spatiotemporal analysis; suspended particulate matter; winter; acidity; aerosol; Article; atmosphere; catalysis; chemical composition; city; controlled study; evolution; India; mass; night; particle size; particulate matter 2.5; photochemistry; polymerization; relative humidity; secondary organic aerosol; winter; Delhi; India
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248195
作者单位	Department of Civil Engineering, Indian Institute of Technology, Kanpur, India; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland; Geosciences Division, Physical Research Laboratory, Ahmedabad, 380009, India; Currently at Department of Civil and Infrastructure Engineering, Indian Institute of Technology, Jodhpur, Rajasthan 342037, India; Centre for Environmental Science and Engineering, Indian Institute of Tehcnology, Kanpur, India
推荐引用方式 GB/T 7714	Thamban N.M.,Lalchandani V.,Kumar V.,et al. Evolution of size and composition of fine particulate matter in the Delhi megacity during later winter[J],2021,267.
APA	Thamban N.M..,Lalchandani V..,Kumar V..,Mishra S..,Bhattu D..,...&Tripathi S.N..(2021).Evolution of size and composition of fine particulate matter in the Delhi megacity during later winter.ATMOSPHERIC ENVIRONMENT,267.
MLA	Thamban N.M.,et al."Evolution of size and composition of fine particulate matter in the Delhi megacity during later winter".ATMOSPHERIC ENVIRONMENT 267(2021).