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dc.contributor.authorPinedo-González, Paulina
dc.contributor.authorWest, A. Joshua
dc.contributor.authorTovar-Sanchez, Antonio
dc.contributor.authorDuarte, Carlos M.
dc.contributor.authorSañudo-Wilhelmy, Sergio A.
dc.date.accessioned2018-12-31T13:20:43Z
dc.date.available2018-12-31T13:20:43Z
dc.date.issued2018-06-05
dc.identifier.citationPinedo-González P, West AJ, Tovar-Sanchez A, Duarte CM, Sañudo-Wilhelmy SA (2018) Concentration and isotopic composition of dissolved Pb in surface waters of the modern global ocean. Geochimica et Cosmochimica Acta 235: 41–54. Available: http://dx.doi.org/10.1016/j.gca.2018.05.005.
dc.identifier.issn0016-7037
dc.identifier.doi10.1016/j.gca.2018.05.005
dc.identifier.urihttp://hdl.handle.net/10754/630468
dc.description.abstractSeveral years have passed since the global phase-out of leaded petrol use. Nonetheless, emissions from anthropogenic activities remain the principal source of Pb to the oceans. The distribution of elemental Pb and its stable isotopes throughout the surface ocean provide information on the source and transport of these anthropogenic inputs. This study presents dissolved Pb concentrations and isotopic distributions from 110 surface water samples collected during the Malaspina 2010 Circumnavigation Expedition. Dissolved Pb concentrations ranged from 10 pM to 49 pM across the sampling stations covering all major ocean basins. The highest concentrations were found in the northeast Atlantic Ocean and the lowest in both the south Pacific and south Atlantic Oceans. Lead concentrations measured in the north Pacific Ocean, near Hawaii, were compared to previously published data from the same region. That comparison showed that Pb concentration has decreased ∼40% since 1975, although the rate of decrease has slowed in the past two decades. The overall decline in concentration probably has been induced by the cessation of leaded gasoline use in North America. The temporal evolution of stable Pb isotopes in this region shows a shift from dominant North American-like composition in 1979 towards a more Asian-like composition in later years. More widely, the distribution of Pb and Pb isotopes measured in the Malaspina sample set of global surface waters were compared with previously published ratios of aerosols and other atmosphere-derived Pb sources from the countries surrounding the different ocean basins. This comparison identified the potential Pb sources to each ocean basin, providing new insights into the transport and fate of Pb in the oceans.
dc.description.sponsorshipThis research was partially supported by NSF OCE (award #1335269), a USC Graduate School Dissertation Completion Fellowship, and the Spanish Ministry of Economy and Competitiveness through the Malaspina 2010 expedition project (Consolider-Ingenio 2010, CSD2008-00077). We thank L. Pinho, E. Mesa, H. Marota and A. Dorsett for help with metal sampling, and the captain and crew of R/V Hespérides for help during the circumnavigation. Three reviewers and the Associate Editor are thanked for constructive comments that helped improve the manuscript. This work was presented in the 2015 AGU trace metal session entitled as an “unofficial” tribute to Russ Flegal. This work is dedicated to Russ.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0016703718302588
dc.subjectAnthropogenic emissions
dc.subjectLead
dc.subjectLead concentration
dc.subjectLead isotopes
dc.subjectSurface waters global ocean
dc.titleConcentration and isotopic composition of dissolved Pb in surface waters of the modern global ocean
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentMarine Science Program
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalGeochimica et Cosmochimica Acta
dc.contributor.institutionDepartment of Earth Sciences, University of Southern California, Los Angeles, CA, , United States
dc.contributor.institutionDepartment of Ecology and Coastal Management, Andalusian Institute for Marine Science, ICMAN (CSIC), Puerto Real, Cádiz, , Spain
dc.contributor.institutionDepartment of Biological Sciences, University of Southern California, Los Angeles, CA, , United States
kaust.personDuarte, Carlos M.
dc.date.published-online2018-06-05
dc.date.published-print2018-08


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