气候变化领域集成服务门户(CCPortal): Impact assessment of continental and marine air-mass on size-resolved aerosol chemical composition over coastal atmosphere: Significant organic contribution in coarse mode fraction

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DOI	10.1016/j.atmosres.2020.105216
	Impact assessment of continental and marine air-mass on size-resolved aerosol chemical composition over coastal atmosphere: Significant organic contribution in coarse mode fraction
	Aswini A.R.; Hegde P.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	Size-segregated aerosols (five stages from <1.1 to >7 μm in diameter) collected from a coastal location in south-west peninsular India were analysed for water-soluble ionic species, carbonaceous aerosols and metallic species on a seasonal basis for two years (2017–19). The annual mean concentration of the components Na+, Ca2+, Mg2+, Cl−, NO3−, Al, Fe exhibited coarse mode (> 2 μm) enhancement; while NH4+, K+, SO42−, MSA−, oxalate, Organic carbon (OC), Elemental carbon (EC) peaked in fine mode (< 2 μm). The contribution of fine mode aerosols dominated under the influence of continental air-mass and a relative shift towards coarse mode size regime with respect to marine air-mass was observed. The relative contribution of analysed species showed the dominance of sea-salt fraction in coarse mode during monsoon, anthropogenic ions in fine mode during post-monsoon, crustal species in coarse mode during pre-monsoon and carbonaceous species in fine mode during winter. While nss-SO42− was found to be a major component of fine mode aerosol fraction, OC contributed significantly for both coarse and fine mode. Distinct seasonal variation in OC size-distribution was observed. Fine mode OC dominated during post-monsoon and winter while coarse mode OC peaked during pre-monsoon and monsoon, indicating its multiple sources and formation pathways. The water-soluble fraction of OC predominantly existed in fine mode and was modulated by changing synoptic air-masses. The water insoluble OC fraction was found to be modified by sea-land breeze activities and exhibited coarse mode nature. The significant contribution of OC in coarse mode size regime over this coastal atmosphere has been attributed to; the condensation of gaseous precursors on pre-existing coarse particles leading to the formation of coarse mode WSOC and the primary emission from natural terrestrial and marine organic matter resulting in the emission of coarse mode WIOC. © 2020 Elsevier B.V.
英文关键词	Chemical composition; Coarse mode OC; Continental; Marine; Size-segregated
语种	英语
scopus关键词	Aerosols; Meteorology; Organic carbon; Aerosol chemical composition; Carbonaceous aerosol; Carbonaceous species; Continental air mass; Relative contribution; Seasonal variation; Water soluble fraction; Water-soluble ionic species; Atmospheric thermodynamics; aerosol composition; air mass; chemical composition; coastal zone; condensation; continental lithosphere; marine atmosphere; monsoon; particle size; seasonal variation
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/141682
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India
推荐引用方式 GB/T 7714	Aswini A.R.,Hegde P.. Impact assessment of continental and marine air-mass on size-resolved aerosol chemical composition over coastal atmosphere: Significant organic contribution in coarse mode fraction[J],2021,248.
APA	Aswini A.R.,&Hegde P..(2021).Impact assessment of continental and marine air-mass on size-resolved aerosol chemical composition over coastal atmosphere: Significant organic contribution in coarse mode fraction.Atmospheric Research,248.
MLA	Aswini A.R.,et al."Impact assessment of continental and marine air-mass on size-resolved aerosol chemical composition over coastal atmosphere: Significant organic contribution in coarse mode fraction".Atmospheric Research 248(2021).