NDLI: Environmental Change and Atmospheric Contamination on Svalbard: Sediment Chronology

Content Provider	Springer Nature Link
Author	Appleby, P.G.
Copyright Year	2004
Abstract	Sediment cores collected from eight lakes along the western coast of Svalbard as part of a project investigating atmospheric pollution and environmental change in Arctic regions were dated radiometrically using natural ($^{210}$Pb) and artificial ($^{137}$Cs and $^{241}$Am) fallout radionuclides. At four sites the sedimentation rates were relatively uniform, and in consequence the $^{210}$Pb dates were relatively unambiguous. At the remaining sites there were irregularities in the $^{210}$Pb activity versus depth profiles, indicating significant variations in the net sediment accumulation rate during the past 120 years. At these sites, there were significant differences between $^{210}$Pb dates calculated using the two standard simple dating models, constant rate of supply (CRS) and constant initial concentration (CIC). In most cases, stratigraphic dates based on the $^{137}$Cs and $^{241}$Am records supported use of the CRS model, though at one site (Ossian Sarsfjellet) the CIC model appeared more appropriate. The irregularities in the $^{210}$Pb records were mainly caused by episodes of accelerated sedimentation due, for example, to inwash or slump events, though at some sites there appears to have been a systematic increase in sediment accumulation rates in recent decades. Sediment accumulation rates were generally lower at the northern sites, and higher at the more southerly locations. Mean sediment accumulation rates varied by an order of magnitude, ranging from 0.002 to 0.050 g cm$^{−2}$ y$^{−1}$ (0.02–0.10 cm y$^{−1}$). $^{210}$Pb fluxes measured from the core inventories were mostly in the range 34–80 Bq m$^{−2}$ y$^{−1}$ typical of Arctic sites. Much higher values, recorded at two sites (Birgervatnet and Daltjørna), may be due to significant inputs from the catchments during spring thaw.
Starting Page	433
Ending Page	443
Page Count	11
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	31
Issue Number	4
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Environment Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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