NDLI: A test of the possible influence of seabird activity on the $^{210}$Pb flux in high Arctic ponds at Cape Vera, Devon Island, Nunavut: implications for radiochronology

Content Provider	Springer Nature Link
Author	Michelutti, N. Blais, J. M. Liu, H. Keatley, B. E. Douglas, M. S. V. Mallory, M. L. Smol, J. P.
Copyright Year	2008
Abstract	A large seabird colony of northern fulmars (Fulmarus glacialis) at Cape Vera on Devon Island in the Canadian high Arctic has been shown to act as an effective biological pump, transporting large quantities of marine-derived nutrients and contaminants to the ponds beneath their nesting sites. Previous research has shown that seabirds also have the potential to elevate radionuclide concentrations in their immediate surroundings. Here, we assess the influence of the Cape Vera seabird colony on the $^{210}$Pb budgets of six affected ponds and one control site, and discuss potential implications with respect to $^{210}$Pb dating methodologies. In general, fluxes of $^{210}$Pb at Cape Vera were similar to, or less than, those measured at other Arctic locations not influenced by seabirds. Plots of unsupported $^{210}$Pb activity versus depth showed a number of non-monotonic features in all sediment cores, necessitating the use of the constant-rate-of-supply (CRS) model to derive age-depth profiles. We conclude that seabird activity has not dramatically increased the $^{210}$Pb flux to the ponds at Cape Vera. Overall, the low flux of excess $^{210}$Pb made accurate dating problematic for some of the study cores, necessitating the use of independent dating markers (e.g., $^{137}$Cs and PCB concentrations) to verify the reliability of the chronologies.
Starting Page	783
Ending Page	791
Page Count	9
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	40
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-02-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{210}$Pb radiochronology Paleolimnology Arctic ponds Biovectors Northern fulmars Polychlorinated biphenyls Contaminants Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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