气候变化领域集成服务门户(CCPortal): Influence of anthropogenic emissions on wet deposition of pollutants and rainwater acidity in Guwahati; a UNESCO heritage city in Northeast India

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DOI	10.1016/j.atmosres.2019.104683
	Influence of anthropogenic emissions on wet deposition of pollutants and rainwater acidity in Guwahati; a UNESCO heritage city in Northeast India
	Garaga R.; Chakraborty S.; Zhang H.; Gokhale S.; Xue Q.; Kota S.H.
发表日期	2020
ISSN	0169-8095
卷号	232
英文摘要	Guwahati, the largest urban corridor of Northeast India, is one of the United Nations Educational, Scientific and Cultural Organization (UNESCO) world heritage sites and one of the 200 eco-regions in the world. The present study investigates the characterization of chemical components and sources of precipitation samples collected in Guwahati during June 2016–June 2017. Acidic rain events occurred throughout the year, with a frequency of 64% and 87% during monsoon and non-monsoon seasons, respectively. Higher contributions of the acidic species (SO4 2− and NO3 −) coinciding with poor neutralizing capacity of crustal species (Ca2+, K+ and Mg2+) led to acid rain in this region. Isotope analysis (δ18O and δD) indicated that monsoonal and non-monsoonal rains were of marine and non-marine origins, respectively. This is further supported by the back trajectory analysis as majority of the individual rain events during d-excess<10‰ i.e. monsoon, indicated their maximum contribution from ocean while, during d-excess>10‰ i.e. non-monsoon, the trajectories originated from water-inland. The enrichment factors (EF) for Pb, Zn, Co and Cu were >5, indicating the dominance of anthropogenic sources in this region. The Positive Matrix Factorization (PMF) along with isotope analysis identified marine (40%) as the major source in monsoon and industrial emissions (28%) in non-monsoon, indicating rainwater evaporation is more of ocean and continental origin during monsoon and non-monsoons, respectively. This study suggests the need of further studies and implementation of stringent anthropogenic regulations not only in local but also at regional and global scale, in this acid rain prone region. © 2019 Elsevier B.V.
英文关键词	Acid neutralizing capacity; HYSPLIT; Isotope analysis; Northeast India; PMF; UNESCO site; Wet deposition
语种	英语
scopus关键词	Acid rain; Chemical analysis; Deposition; Factorization; Industrial emissions; Isotopes; Urban growth; Acid neutralizing capacity; HYSPLIT; Isotope analysis; Northeast india; UNESCO site; Wet deposition; Atmospheric thermodynamics; acid rain; acidity; anthropogenic source; atmospheric modeling; isotopic analysis; monsoon; wet deposition; World Heritage Site; Assam; Gauhati; India
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141978
作者单位	Department of Civil Engineering, Indian Institute of Technology Guwahati, India; Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India; Department of Environmental Science and Engineering, Fudan University, Shanghai, China; Department of Environment, College of Architecture and Environment, Sichuan University, Chengdu, China; Department of Civil Engineering, Indian Institute of Technology Delhi, India
推荐引用方式 GB/T 7714	Garaga R.,Chakraborty S.,Zhang H.,et al. Influence of anthropogenic emissions on wet deposition of pollutants and rainwater acidity in Guwahati; a UNESCO heritage city in Northeast India[J],2020,232.
APA	Garaga R.,Chakraborty S.,Zhang H.,Gokhale S.,Xue Q.,&Kota S.H..(2020).Influence of anthropogenic emissions on wet deposition of pollutants and rainwater acidity in Guwahati; a UNESCO heritage city in Northeast India.Atmospheric Research,232.
MLA	Garaga R.,et al."Influence of anthropogenic emissions on wet deposition of pollutants and rainwater acidity in Guwahati; a UNESCO heritage city in Northeast India".Atmospheric Research 232(2020).