干旱区生态环境知识资源中心(Arid): Seasonal Variation in Chemical Composition of Size-Segregated Aerosols Over the Northeastern Arabian Sea

Arid

DOI	10.3389/fenvs.2020.619174
	Seasonal Variation in Chemical Composition of Size-Segregated Aerosols Over the Northeastern Arabian Sea
	Kaushik, Ankush; Kumar, Ashwini; Aswini, M. A.; Panda, P. P.; Shukla, Garima; Gupta, N. C.
通讯作者	Kumar, A (corresponding author), CSIR Natl Inst Oceanog, Geol Oceanog Div, Panaji, India.
来源期刊	FRONTIERS IN ENVIRONMENTAL SCIENCE
EISSN	2296-665X
出版年	2021
卷号	8
英文摘要	Water-soluble species constitute a significant fraction (up to 60-70%) of the total aerosol loading in the marine atmospheric boundary layer (MABL). The indirect effects, that is, climate forcing due to modification of cloud properties depend on the water-soluble composition of aerosols. Thus, the characterization of aerosols over the MABL is of greater relevance. Here, we present 1-year long aerosol chemical composition data of PM10 and PM2.5 at a costal location in the northeastern Arabian Sea (Goa; 15.45 degrees N, 73.20 degrees E, 56 m above the sea level). Average water-soluble ionic concentration (sum of anion and cation) is highest (25.5 +/- 6.9 and 19.6 +/- 5.8 mu g center dot m(-3) for PM10 and PM2.5, respectively) during winter season and lowest during post-monsoon (17.3 +/- 9.1 and 14.4 +/- 8.1 mu g center dot m(-3) for PM10 and PM2.5, respectively). Among water-soluble ionic spices, SO42- ion was found to be dominant species in anions and NH4+ is dominant in cations, for both PM10 and PM2.5 during all the seasons. These observations clearly hint to the contribution from anthropogenic emission and significant secondary inorganic species formation. Sea-salt (calculated based on Na+ and Cl-) concentration shows significant temporal variability with highest contribution during summer seasons in both fractions. Sea-salt corrected Ca2+, an indicator of mineral dust is found mostly during summer months, particularly in PM10 samples, indicates contribution from mineral dust emissions from arid/semiarid regions located in the north/northwestern India and southwest Asia. These observations are corroborated with back-trajectory analyses, wherein air parcels were found to derive from the desert area in summer and Indo-Gangetic Plains (a hot spot for anthropogenic emissions) during winter. In addition, we also observe the presence of nss-K+ (sea-salt corrected), for PM2.5, particularly during winter months, indicating influence of biomass burning emissions. The impact on aerosol chemistry is further assessed based on chloride depletion. Chloride depletion is observed very significant during post-monsoon months (October and November), wherein more than 80 up to 100% depletion is found, mediated by excess sulfates highlighting the role of secondary species in atmospheric chemistry. Regional scale characterization of atmospheric aerosols is important for their better parameterization in chemical transport model and estimation of radiative forcing.
英文关键词	aerosols chemical composition Arabian Sea water soluble ionic composition secondary inorganic species
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000627581800001
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350292
作者单位	[Kaushik, Ankush; Kumar, Ashwini; Aswini, M. A.; Panda, P. P.; Shukla, Garima] CSIR Natl Inst Oceanog, Geol Oceanog Div, Panaji, India; [Shukla, Garima] Acad Sci & Innovat Res, Ghaziabad, India; [Gupta, N. C.] Guru Gobind Singh Indraprastha Univ, Univ Sch Environm Management, New Delhi, India
推荐引用方式 GB/T 7714	Kaushik, Ankush,Kumar, Ashwini,Aswini, M. A.,et al. Seasonal Variation in Chemical Composition of Size-Segregated Aerosols Over the Northeastern Arabian Sea[J],2021,8.
APA	Kaushik, Ankush,Kumar, Ashwini,Aswini, M. A.,Panda, P. P.,Shukla, Garima,&Gupta, N. C..(2021).Seasonal Variation in Chemical Composition of Size-Segregated Aerosols Over the Northeastern Arabian Sea.FRONTIERS IN ENVIRONMENTAL SCIENCE,8.
MLA	Kaushik, Ankush,et al."Seasonal Variation in Chemical Composition of Size-Segregated Aerosols Over the Northeastern Arabian Sea".FRONTIERS IN ENVIRONMENTAL SCIENCE 8(2021).