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The atmospheric lead record preserved in lagoon sediments at a remote equatorial Pacific location: Palmyra Atoll, northern Line Islands |
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| Authors: | Collen John D Baker Joel A Dunbar Robert B Rieser Uwe Gardner Jonathan P Garton David W Christiansen Kylie J |
| Institution: | a Centre for Marine Environmental and Economic Research, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand b School of Geography, Environment and Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand c Department of Environmental Earth System Science, Braun Hall (Bldg 320), Stanford University, CA 94-305-2115, USA d School of Biology, Georgia Institute of Technology, Ferst Avenue, Atlanta, GA 30332, USA |
| Abstract: | Anthropogenic lead (Pb) inputs to the atmosphere increased greatly over the past century and now dominate Pb supply to the oceans. However, the Pb content of sediments across the equatorial Pacific region is relatively unknown, and data exist only for deep sea sites where Pb deposition lags surface water inputs by up to a century. Here we present ICP-MS analyses of Pb of a core from a lagoon at Palmyra Atoll, northern Line Islands, that spans approximately the past 160 years. The non-bioturbated sediments of the euxinic lagoon, coupled with rapid rates of deposition, provide a unique fine-scale record of atmospheric Pb supply at a remote Pacific location. These first observations of historic Pb sedimentation in an atoll lagoon reveal a 63-fold increase in Pb flux to sediments during the past century and correlate directly with the North American consumption of leaded gasoline that began in 1926. |
| Keywords: | Atmospheric pollution Leaded gasoline Palmyra Atoll Pb geochemistry |
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