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DOI	10.1016/j.atmosenv.2021.118375
	Highly significant impact of mineral dust on aerosol hygroscopicity at New Delhi
	Arub Z.; Singh G.; Habib G.; Sunder Raman R.
发表日期	2021
ISSN	1352-2310
卷号	254
英文摘要	All conventional hygroscopicity parameter (κ) estimates are based on ammonium salts being the dominant salts, besides sea salt at marine locations. This grossly underestimates κ for highly polluted cities like New Delhi which is subjected to high mineral dust. To validate this hypothesis, the impact of mineral dust on κ was quantified following two mathematical approaches based on Mann-Kendall's test which differed in the sequence followed for compound formation. This leads to a remarkably high increment in κ, on an average of 57% and 63.5% during the day and night respectively, for the period Dec 2012–2014 and is based on the detailed chemical speciation of PM2.5 data. The inter-comparison of κ obtained from various analytical methods challenge the traditional way of estimating κ by including the chemical composition of a few dominant species and ignoring the others without paying any heed to the dependence of κ on Temperature (T) and Relative Humidity (RH). An increase in the ratio of water-soluble organic carbon to organic carbon lessened the impact of mineral dust on κ. The insolubility of calcium salts also decreased the effect of mineral dust, but at the same time lead to MgCl2 formation which augmented the estimated κ. The highest obtained κ was 0.82 (on 23/7/2014 during the night). The impact of mineral dust was also found to be significant for two other Indian (Durg and Kanpur) and Chinese (Xian and Beijing) cities for both PM1 and PM2.5 regimes. The high value of κ and impact of mineral dust on κ can be crucial in Cloud Condensation Nuclei (CCN) estimation at polluted sites subjected to mineral dust and thus impact precipitation quantification by Global Climatic models (GCMs), lead to visibility deterioration and affect the indirect radiative forcing. © 2021 Elsevier Ltd
关键词	Aerosol Aerosol chemistry Hygroscopicity Mineral dust
语种	英语
scopus关键词	Atmospheric radiation; Chemical analysis; Chemical speciation; Chlorine compounds; Dust; Estimation; Minerals; Organic carbon; Salts; Aerosol chemistry; Ammonium salt; Compound formation; Hygroscopicity; Mann-Kendall test; Marine locations; Mathematical approach; Mineral dust; PM$-2.5$; Sea salts; Aerosols; ammonia; magnesium chloride; organic carbon; sodium chloride; water; aerosol; chemical composition; hygroscopicity; mineral dust; numerical model; organic carbon; sea salt; speciation (chemistry); aerosol; analytic method; Article; atmospheric particulate matter; biomass; controlled study; environmental impact; environmental temperature; humidity; India; mathematical model; mineral dust; priority journal; rainy season; seasonal variation; solubility; wettability; Beijing [China]; Chhattisgarh; China; Delhi; Durg; India; Kanpur; New Delhi; Shaanxi; Uttar Pradesh; Xian
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/248449
作者单位	Department of Civil Engineering, Indian Institute of Technology, Delhi, New Delhi, India; Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, India; Center for Research on Environment and Sustainable Technologies, Indian Institute of Science Education and Research Bhopal, India
推荐引用方式 GB/T 7714	Arub Z.,Singh G.,Habib G.,et al. Highly significant impact of mineral dust on aerosol hygroscopicity at New Delhi[J],2021,254.
APA	Arub Z.,Singh G.,Habib G.,&Sunder Raman R..(2021).Highly significant impact of mineral dust on aerosol hygroscopicity at New Delhi.ATMOSPHERIC ENVIRONMENT,254.
MLA	Arub Z.,et al."Highly significant impact of mineral dust on aerosol hygroscopicity at New Delhi".ATMOSPHERIC ENVIRONMENT 254(2021).