气候变化领域集成服务门户(CCPortal): Provenance tracing of long-range transported dust over the Northeastern Arabian Sea during the southwest monsoon

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DOI	10.1016/j.atmosres.2020.105377
	Provenance tracing of long-range transported dust over the Northeastern Arabian Sea during the southwest monsoon
	Suresh K.; Singh U.; Kumar A.; Karri D.; Peketi A.; Ramaswamy V.
发表日期	2021
ISSN	0169-8095
卷号	250
英文摘要	One of the major pathways for dust supply to surface water of the Arabian Sea is via wet deposition, which is significant during southwest Monsoon (June-September). Aeolian dust supplies macro and micronutrients, which can impact on several marine biogeochemical processes. Here we report, major elements and rare earth elements (REEs) content as well as mineralogical and Sr-Nd isotopic composition of particulate collected from wet deposition (WDP) during the southwest monsoon period over the Northeastern Arabian Sea (NEAS) (Goa; 15.4° N, 73.8° E) in 2013. The collected WDP samples are classified into three categories based on changing wind regime, namely: (1) beginning of monsoon (BM; June); (2) mid of monsoon (MM; July-August) and (3) end of monsoon (EM; September). Our result highlights a significant temporal variability in REEs pattern showing a decreasing trend of Lan/Ybn and relatively higher Eu*/Eu anomaly during mid of monsoon compared to beginning and end of monsoon period. High palygorskite (P) with moderate smectite (S) is observed for beginning of monsoon and majority of mid monsoon samples, however, high smectite with moderate palygorskite and negligible palygorskite and smectite abundance is observed for few of mid monsoon and end of monsoon samples, respectively, indicating change in dust sources during the southwest monsoon period. We also observed temporal variability in 87Sr/86Sr (0.7090–0.7193) and εNd (−2.3 to −9.1) isotopic compositions wherein less radiogenic 87Sr/86Sr and relatively more positive εNd is exhibited by mid of monsoon samples compared to those observed in beginning and end of monsoon collections. The seasonal variability in geochemical tracers are related to changes in the dust source areas which are identified as (1) the Arabian Peninsula contributing significantly in beginning of monsoon and majority of mid monsoon samples; (2) Northeastern Africa contributing to some of the mid monsoon samples and (3) Southwest Asia and Thar Desert in end of monsoon samples. These source identification using geochemical tracers are corroborated by the satellite images (CALIPSO and aerosol index maps) and back-trajectory analyses. © 2020 Elsevier B.V.
英文关键词	Arabian Sea; Clay mineralogy; Mineral dust; Sr-Nd isotopes; Wet deposition
语种	英语
scopus关键词	Binary alloys; Clay minerals; Deposition; Dust; Exploratory geochemistry; Isotopes; Maps; Neodymium alloys; Rare earths; Strontium alloys; Surface waters; Tracers; Back trajectory analysis; Biogeochemical process; Isotopic composition; Macro-and micronutrients; Nd isotopic compositions; Rare earth elements (REEs); Seasonal variability; Source identification; Atmospheric thermodynamics; clay mineral; long range transport; mineral dust; monsoon; neodymium isotope; provenance; source identification; strontium isotope; wet deposition; Arabian Sea; Indian Ocean
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/162244
作者单位	CSIR-National Institute of Oceanography, Dona Paula, Goa, India; School of Earth, Ocean and Atmospheric Sciences, Goa UniversityGoa, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-National Institute of OceanographyGoa, India
推荐引用方式 GB/T 7714	Suresh K.,Singh U.,Kumar A.,et al. Provenance tracing of long-range transported dust over the Northeastern Arabian Sea during the southwest monsoon[J],2021,250.
APA	Suresh K.,Singh U.,Kumar A.,Karri D.,Peketi A.,&Ramaswamy V..(2021).Provenance tracing of long-range transported dust over the Northeastern Arabian Sea during the southwest monsoon.Atmospheric Research,250.
MLA	Suresh K.,et al."Provenance tracing of long-range transported dust over the Northeastern Arabian Sea during the southwest monsoon".Atmospheric Research 250(2021).