High-resolution historical records from Pettaquamscutt River basin sediments: 2. Pb isotopes reveal a potential new stratigraphic marker

Lima, Ana Lúcia C.; Bergquist, Bridget A.; Boyle, Edward A.; Reuer, Matthew K.; Dudás, Francis Ő.; Reddy, Christopher M.; Eglinton, T. I.

doi:10.1016/j.gca.2004.10.008

Cited by 90 publications

(87 citation statements)

References 69 publications

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“…S3). Notably, these Pb isotopic ratios show that the increase in Pb concentrations at the middle of last century and then the slow decline are not due to the introduction and subsequent phase out of leaded gasoline in Chile-in spite of the similarity of the temporal variability of the Pb concentration profile in sediments in Lake Thompson to those in sediments of lakes and rivers elsewhere that corresponded with the use of leaded gasoline during the previous century (e.g., Callender and vanMetre 1997;Renberg et al 2001;Van Metre and Mahler 2004;Lima et al 2005).…”

Section: Lead Isotopic Compositionmentioning

confidence: 99%

Remobilization of trace elements by forest fire in Patagonia, Chile

et al. 2015

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Temporal changes in the amounts of trace elements (As, Co, Cu, Mn, Ni, Pb, and Zn) and their correlations with temporal changes in charcoal abundance in age-dated sediments collected from Lake Thompson in Patagonia, Chile, attest to the substantial pyrogenic remobilization of contaminants that occurred in Patagonia during the mid-1900s. This remobilization was concurrent with the extensive slash and burn period in the region during that period. The changes in concentrations of Co, Cu, and Ni in relation to charcoal abundance in the lacustrine sediments over time were small compared to those of As, Mn, Pb, and Zn. However, the relatively low enrichment factors of all those trace elements, normalized to Fe, indicate that they were predominantly derived from local, natural sources impacted by fires rather than industrial sources. The primarily local source of Pb in the sediments was corroborated by the temporal consistency of its isotopic ratios ( 206 Pb/ 207 Pb: 208 Pb/ 206 Pb), which were similar to previously reported values for natural lead in Central and Southern Chile. However, the pyrogenic remobilization of both natural and industrial trace elements by forest fires in Chile and elsewhere is expected to rise as a consequence of climate change, which is projected to increase both the frequency and intensity of forest fires on a global scale.

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Section: Lead Isotopic Compositionmentioning

confidence: 99%

Remobilization of trace elements by forest fire in Patagonia, Chile

et al. 2015

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“…We assumed that industrial emissions were 305 transported to East River Marsh by prevailing wind patterns and deposited on the salt-marsh surface 306 within a few years and without further isotopic fractionation (e.g. Gobeil et al, 2013 Pb in salt-marsh sediment (Gobeil et al, 2013;Kemp et al, 2012a) and varved 311 lake sediments (Lima et al, 2005). , 1998;Varekamp et al, 1992).…”

mentioning

confidence: 99%

Relative sea-level change in Connecticut (USA) during the last 2200 yrs

Kemp

Hawkes

Donnelly

et al. 2015

Earth and Planetary Science Letters

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“…Boyle hypothesized that Jordan Basin is a site that should have the atmospheric signal of mining and smelting that began in the upper Mississippi Valley (UMV) between about 1840 and 1850. That airborne signal is found at highly resolved sites downwind, for example, the Pettaquamscutt River in Rhode Island (Lima et al, 2005). Near the bottom of MC44, 206/207 Pb data indicates a peak that may be the UMV emission maximum.…”

Section: Radiocarbon Dates and Sedimentation Rates In Jordan Basinmentioning

confidence: 89%

Sediment flux and recent paleoclimate in JordanBasin, Gulf of Maine

Keigwin

Pilskaln

2015

Continental Shelf Research

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We report planktonic foraminiferal fluxes (accumulation rates) and oxygen isotopes (δ 18 O) from a nine-month sediment trap deployment, and δ 18 O from three sediment cores in Jordan Basin, Gulf of Maine. The sediment trap was deployed at 150 m, about halfway to the basin floor, and samples were collected every three weeks between August 2010 and May 2011. The planktonic foraminiferal fauna in the trap is dominated by Neogloboquadrina incompta that reached a maximum flux in the second half of October. Oxygen isotope ratios on that species indicate that on average during the collecting period it lived in the surface mixed layer, when compared to predicted values based on data from a nearby hydrographic buoy from the same period. New large diameter piston cores from Jordan Basin are 25 and 28 m long. Marine hemipelagic sediments are 25 m thick, and the sharp contact with underlying red deglacial sediments is bracketed by two radiocarbon dates on bivalves that indicate ice-free conditions began 16,900 calibrated years ago. Radiocarbon dating of foraminifera indicates that the basin floor sediments (270-290 m) accumulated at >3 m/kyr during the Holocene, whereas rates were about one tenth that on the basin slope (230 m). In principle, Jordan Basin sediments have the potential to provide time series with interannual resolution. Our results indicate the Holocene is marked by ~2°C variability in SST, and the coldest events of the 20th century, during the mid 1960s and mid 1920s, appear to be recorded in the uppermost 50 cm of the seafloor.

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High-resolution historical records from Pettaquamscutt River basin sediments: 2. Pb isotopes reveal a potential new stratigraphic marker

Cited by 90 publications

References 69 publications

Remobilization of trace elements by forest fire in Patagonia, Chile

Remobilization of trace elements by forest fire in Patagonia, Chile

Relative sea-level change in Connecticut (USA) during the last 2200 yrs

Sediment flux and recent paleoclimate in JordanBasin, Gulf of Maine

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