Anthropogenic Lead (Pb) deposition history of the western Indian Ocean from coral-based Pb/Ca ratio and Pb isotope records

Despite the rapid industrial growth and urban expansion along the coastline of the Western Indian Ocean, knowledge of both historical and current levels of anthropogenic lead (Pb) contamination, as well as its impact on the biosphere, remains limited compared to other industrialized regions. We pres...

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Veröffentlicht in:The Science of the total environment 2024-12, Vol.955, p.177312, Article 177312
Hauptverfasser: Rahaman, Waliur, Chanakya, I.V. Satya, Ray, Iravati, Tarique, Mohd, Fousiya, A.A., Das, Reshmi, Misra, Sambuddha
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container_start_page 177312
container_title The Science of the total environment
container_volume 955
creator Rahaman, Waliur
Chanakya, I.V. Satya
Ray, Iravati
Tarique, Mohd
Fousiya, A.A.
Das, Reshmi
Misra, Sambuddha
description Despite the rapid industrial growth and urban expansion along the coastline of the Western Indian Ocean, knowledge of both historical and current levels of anthropogenic lead (Pb) contamination, as well as its impact on the biosphere, remains limited compared to other industrialized regions. We present a twenty-four year long coralline record (1989–2013) of Pb/Ca ratio and Pb isotopes from the Lakshadweep coral reef in the Western Indian Ocean. This new record provides critical insight into source(s), possible transport pathways, and temporal trends in Pb deposition during the studied interval. The long-term trend in the surface seawater Pb concentration ([Pb]SW), reconstructed from the coralline Pb/Ca record, reveals almost doubling in [Pb]SW from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Bayesian mixing model calculations reveal that among the potential Pb polluting sources to this region, anthropogenic aerosol from the hinterland of the continents was the dominant contributor of Pb (23–89 %). A compilation of available Pb records from the Indian Ocean reveals that Pb isotope distribution patterns in the western and central equatorial Indian Oceans are distinctly different from those observed in the eastern Indian Ocean. The western Indian Ocean records exhibit lower Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) compared to the East Indian Ocean, suggesting a greater influence of anthropogenic Pb on seawater concentration. These findings highlight the spatio-temporally spread of anthropogenic Pb pollution and its potential impact on the biosphere in the Indian Ocean and therefore emphasize the urgent need for region-specific environmental management strategies. This study reconstructs the history of lead (Pb) pollution in the Western Indian Ocean. We analyzed a specimen of coral, collected from Lakshadweep, to create a 24-year-long (years 1989 to 2013) for Pb concentration and isotopic composition of seawater in the Western Indian Ocean. Using the coralline Pb/Ca ratio and Pb isotope data, we have reconstructed surface ocean Pb concentration ([PbSW]) and isotopic composition to understand the sources, transport pathways, and temporal depositional trends over the western Indian Ocean during the past two decades. This reconstruction of [PbSW] reveals a doubling from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Our investigations to fingerprint the Pb source(s) to our study area reveal that majority of the anthropoge
doi_str_mv 10.1016/j.scitotenv.2024.177312
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The long-term trend in the surface seawater Pb concentration ([Pb]SW), reconstructed from the coralline Pb/Ca record, reveals almost doubling in [Pb]SW from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Bayesian mixing model calculations reveal that among the potential Pb polluting sources to this region, anthropogenic aerosol from the hinterland of the continents was the dominant contributor of Pb (23–89 %). A compilation of available Pb records from the Indian Ocean reveals that Pb isotope distribution patterns in the western and central equatorial Indian Oceans are distinctly different from those observed in the eastern Indian Ocean. The western Indian Ocean records exhibit lower Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) compared to the East Indian Ocean, suggesting a greater influence of anthropogenic Pb on seawater concentration. These findings highlight the spatio-temporally spread of anthropogenic Pb pollution and its potential impact on the biosphere in the Indian Ocean and therefore emphasize the urgent need for region-specific environmental management strategies. This study reconstructs the history of lead (Pb) pollution in the Western Indian Ocean. We analyzed a specimen of coral, collected from Lakshadweep, to create a 24-year-long (years 1989 to 2013) for Pb concentration and isotopic composition of seawater in the Western Indian Ocean. Using the coralline Pb/Ca ratio and Pb isotope data, we have reconstructed surface ocean Pb concentration ([PbSW]) and isotopic composition to understand the sources, transport pathways, and temporal depositional trends over the western Indian Ocean during the past two decades. This reconstruction of [PbSW] reveals a doubling from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. 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[Display omitted] •The 24-year Pb pollution history of the western Indian Ocean was reconstructed.•Pb concentration record shows a doubling in the studied interval (1989 to 2013).•Anthropogenic aerosols are the dominant source of Pb in western Indian Ocean.•Western Indian Ocean is more contaminated by anthropogenic Pb than the Eastern Indian Ocean.</description><identifier>ISSN: 0048-9697</identifier><identifier>ISSN: 1879-1026</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2024.177312</identifier><identifier>PMID: 39481551</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>aerosols ; Anthropogenic Pb ; Bayesian theory ; biosphere ; coasts ; coral reefs ; corals ; environmental management ; hinterland ; India ; Indian Ocean ; industrialization ; isotopes ; Lakshadweep coral ; lead ; Pb isotopes ; pollution ; seawater ; urbanization</subject><ispartof>The Science of the total environment, 2024-12, Vol.955, p.177312, Article 177312</ispartof><rights>2024 Elsevier B.V.</rights><rights>Copyright © 2024. 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This new record provides critical insight into source(s), possible transport pathways, and temporal trends in Pb deposition during the studied interval. The long-term trend in the surface seawater Pb concentration ([Pb]SW), reconstructed from the coralline Pb/Ca record, reveals almost doubling in [Pb]SW from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Bayesian mixing model calculations reveal that among the potential Pb polluting sources to this region, anthropogenic aerosol from the hinterland of the continents was the dominant contributor of Pb (23–89 %). A compilation of available Pb records from the Indian Ocean reveals that Pb isotope distribution patterns in the western and central equatorial Indian Oceans are distinctly different from those observed in the eastern Indian Ocean. The western Indian Ocean records exhibit lower Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) compared to the East Indian Ocean, suggesting a greater influence of anthropogenic Pb on seawater concentration. These findings highlight the spatio-temporally spread of anthropogenic Pb pollution and its potential impact on the biosphere in the Indian Ocean and therefore emphasize the urgent need for region-specific environmental management strategies. This study reconstructs the history of lead (Pb) pollution in the Western Indian Ocean. We analyzed a specimen of coral, collected from Lakshadweep, to create a 24-year-long (years 1989 to 2013) for Pb concentration and isotopic composition of seawater in the Western Indian Ocean. Using the coralline Pb/Ca ratio and Pb isotope data, we have reconstructed surface ocean Pb concentration ([PbSW]) and isotopic composition to understand the sources, transport pathways, and temporal depositional trends over the western Indian Ocean during the past two decades. This reconstruction of [PbSW] reveals a doubling from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Our investigations to fingerprint the Pb source(s) to our study area reveal that majority of the anthropogenic Pb has been contributed by aerosol deposition sourced from the hinterland of the surrounding continents. Our investigation also revealed that the western Indian Ocean is more contaminated by anthropogenic Pb compared to the eastern Indian Ocean. These findings highlight the need for region-specific monitoring efforts in the Indian Ocean as well as the formulation of environmental strategies to mitigate the impact of Pb pollution. [Display omitted] •The 24-year Pb pollution history of the western Indian Ocean was reconstructed.•Pb concentration record shows a doubling in the studied interval (1989 to 2013).•Anthropogenic aerosols are the dominant source of Pb in western Indian Ocean.•Western Indian Ocean is more contaminated by anthropogenic Pb than the Eastern Indian Ocean.</description><subject>aerosols</subject><subject>Anthropogenic Pb</subject><subject>Bayesian theory</subject><subject>biosphere</subject><subject>coasts</subject><subject>coral reefs</subject><subject>corals</subject><subject>environmental management</subject><subject>hinterland</subject><subject>India</subject><subject>Indian Ocean</subject><subject>industrialization</subject><subject>isotopes</subject><subject>Lakshadweep coral</subject><subject>lead</subject><subject>Pb isotopes</subject><subject>pollution</subject><subject>seawater</subject><subject>urbanization</subject><issn>0048-9697</issn><issn>1879-1026</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNqNkU9vEzEQxS0EoqHwFcDH9rCp_63tPUYRhUqR2gOcLa89Sxwl9mI7ReXT4yilV_BhrJF-781oHkKfKFlSQuXNbllcqKlCfFwywsSSKsUpe4UWVKuho4TJ12hBiNDdIAd1gd6VsiPtKU3fogs-CE37ni7Q71Ws25zm9ANicHgD1uOrh_Eae5hTCTWkiLeh1JSfcJpw3QL-BaVCjvgu-mAjvnfQ6pTTAbuU7b4bbQGPH8abtcXZNgds46nHoaSaZsAZGujLe_RmsvsCH57_S_T99vO39dduc__lbr3adI4OPe346LyzelKDkNr20ra9ZS8nEL3WoHrvYZCCe0EpDIopL70WbHRcEqeblF-iq7PvnNPPY1veHEJxsN_bCOlYDKe9YFIoQf4DZZwozqRuqDqjLqdSMkxmzuFg85OhxJwyMjvzkpE5ZWTOGTXlx-chx_EA_kX3N5QGrM4AtKs8BsgnI4gOfGinq8an8M8hfwC_LKbt</recordid><startdate>20241210</startdate><enddate>20241210</enddate><creator>Rahaman, Waliur</creator><creator>Chanakya, I.V. 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Satya</creatorcontrib><creatorcontrib>Ray, Iravati</creatorcontrib><creatorcontrib>Tarique, Mohd</creatorcontrib><creatorcontrib>Fousiya, A.A.</creatorcontrib><creatorcontrib>Das, Reshmi</creatorcontrib><creatorcontrib>Misra, Sambuddha</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rahaman, Waliur</au><au>Chanakya, I.V. Satya</au><au>Ray, Iravati</au><au>Tarique, Mohd</au><au>Fousiya, A.A.</au><au>Das, Reshmi</au><au>Misra, Sambuddha</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Anthropogenic Lead (Pb) deposition history of the western Indian Ocean from coral-based Pb/Ca ratio and Pb isotope records</atitle><jtitle>The Science of the total environment</jtitle><addtitle>Sci Total Environ</addtitle><date>2024-12-10</date><risdate>2024</risdate><volume>955</volume><spage>177312</spage><pages>177312-</pages><artnum>177312</artnum><issn>0048-9697</issn><issn>1879-1026</issn><eissn>1879-1026</eissn><abstract>Despite the rapid industrial growth and urban expansion along the coastline of the Western Indian Ocean, knowledge of both historical and current levels of anthropogenic lead (Pb) contamination, as well as its impact on the biosphere, remains limited compared to other industrialized regions. We present a twenty-four year long coralline record (1989–2013) of Pb/Ca ratio and Pb isotopes from the Lakshadweep coral reef in the Western Indian Ocean. This new record provides critical insight into source(s), possible transport pathways, and temporal trends in Pb deposition during the studied interval. The long-term trend in the surface seawater Pb concentration ([Pb]SW), reconstructed from the coralline Pb/Ca record, reveals almost doubling in [Pb]SW from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Bayesian mixing model calculations reveal that among the potential Pb polluting sources to this region, anthropogenic aerosol from the hinterland of the continents was the dominant contributor of Pb (23–89 %). A compilation of available Pb records from the Indian Ocean reveals that Pb isotope distribution patterns in the western and central equatorial Indian Oceans are distinctly different from those observed in the eastern Indian Ocean. The western Indian Ocean records exhibit lower Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) compared to the East Indian Ocean, suggesting a greater influence of anthropogenic Pb on seawater concentration. These findings highlight the spatio-temporally spread of anthropogenic Pb pollution and its potential impact on the biosphere in the Indian Ocean and therefore emphasize the urgent need for region-specific environmental management strategies. This study reconstructs the history of lead (Pb) pollution in the Western Indian Ocean. We analyzed a specimen of coral, collected from Lakshadweep, to create a 24-year-long (years 1989 to 2013) for Pb concentration and isotopic composition of seawater in the Western Indian Ocean. Using the coralline Pb/Ca ratio and Pb isotope data, we have reconstructed surface ocean Pb concentration ([PbSW]) and isotopic composition to understand the sources, transport pathways, and temporal depositional trends over the western Indian Ocean during the past two decades. This reconstruction of [PbSW] reveals a doubling from ~50 pmol/kg in the year 1990 to ~107 pmol/kg in the year 2013. Our investigations to fingerprint the Pb source(s) to our study area reveal that majority of the anthropogenic Pb has been contributed by aerosol deposition sourced from the hinterland of the surrounding continents. Our investigation also revealed that the western Indian Ocean is more contaminated by anthropogenic Pb compared to the eastern Indian Ocean. These findings highlight the need for region-specific monitoring efforts in the Indian Ocean as well as the formulation of environmental strategies to mitigate the impact of Pb pollution. [Display omitted] •The 24-year Pb pollution history of the western Indian Ocean was reconstructed.•Pb concentration record shows a doubling in the studied interval (1989 to 2013).•Anthropogenic aerosols are the dominant source of Pb in western Indian Ocean.•Western Indian Ocean is more contaminated by anthropogenic Pb than the Eastern Indian Ocean.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>39481551</pmid><doi>10.1016/j.scitotenv.2024.177312</doi></addata></record>
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subjects aerosols
Anthropogenic Pb
Bayesian theory
biosphere
coasts
coral reefs
corals
environmental management
hinterland
India
Indian Ocean
industrialization
isotopes
Lakshadweep coral
lead
Pb isotopes
pollution
seawater
urbanization
title Anthropogenic Lead (Pb) deposition history of the western Indian Ocean from coral-based Pb/Ca ratio and Pb isotope records
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