Natural (210Pb, 7Be) and fallout (137Cs, 239,240Pu, 90Sr) radionuclides as geochemical tracers of sedimentation in Greifensee, Switzerland

Wan, Guojiang; Santschi, Peter H.; Sturm, Michael; Farrenkothen, Klaus.; Lueck, A.; Werth, Esther; Schuler, Ch.

doi:10.1016/0009-2541(87)90162-8

Cited by 142 publications

(77 citation statements)

References 19 publications

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“…Based on our results for Lake Constance and other work [6,11,21], we postulate that remobilization of 2~~ may occur in sediments of eutrophic lakes and that its magnitude may depend on the redox-potential at the water %ediment interface. An indication of Pb remobilization at the water rsediment interface was recently also given by Wan et al [5] and by White and Driscoll [22]. In order to make the 2~~ method more reliable, additional careful investigations of the remobilization processes and mechanisms should be undertaken in other lakes with anoxic conditions.…”

Section: Resultsmentioning

confidence: 90%

“…references [2][3][4]). However, recent sudies led to the hypothesis that 2~~ mobilizes under anoxic or suboxic conditions [5,6] thus producing erraneous results. Another possible tool for dating recent sediments is based on the measurement of a37Cs which was deposited in sediments during the extensive testing of nuclear weapons between 1954 and 1963.…”

Section: Introductionmentioning

confidence: 99%

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Sedimentation rates in the central lake constance determined with210Pb and137Cs

et al. 1987

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Sediment cores from central Lake Constance were dated with Zl~ and [37Cs. A sedimentation rate of(0.11 :t:0.02) g-cm-2.y -I was determined with the 21~ method. 137Cs measurements revealed sedimentation rates of (0.11+0.01) g.cm--~.y -t and (0.08:1:0.01) g.cm-2-y -I, respectively for two different cores sampled at the same location. The lower Cs-dated value indicates incomplete core recovery and demonstrates the sensitivity of this simple dating method to small losses of material at the water/sediment interface. An unambiguous application of the 137Cs method is, therefore, only possible if complete core recovery is ensured. Sedimentation rates based on particulate matter, collected in sediment traps at various water depths, agree with the results of the radioisotope methods. Estimates of 30-125 days residence times for suspended particulate matter were calculated from 7Be meausurements.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Sedimentation rates in the central lake constance determined with210Pb and137Cs

et al. 1987

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“…Finally, two recent studies on Swiss lakes seem to show cases where rernobilization has led to changes in 210Pb distribution that are great enough to cause dating errors (ERTEN et al [1985], WAN et al [1987]). …”

Section: Nevertheless Even If It Fails As a Dating Method 137es Meamentioning

confidence: 98%

“…Surface lake waters had 210pO levels near 10 dpm/lOOkg whereas bottom waters were near 30 dpm/lOOkg, so perhaps the pore waters were a source of 210pO to the lake. WAN et al [1987]) measured 210Pb pore water concentrations of 130 dpm/lOOkg in Greifensee, Switzerland.…”

Section: Nevertheless Even If It Fails As a Dating Method 137es Meamentioning

confidence: 99%

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The biogeochemistry of 210Pb and 210Po in fresh waters and sediments

Benoit¹

1988

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Effects of historical land use on sediment yield from a lacustrine watershed in central Chile

Cisternas¹,

Araneda²,

Martínez³

et al. 2001

Earth Surf. Process. Landforms

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Sediment yield in the San Pedro Lake watershed, inferred from sedimentation in the lake, can be related to land use changes shown on aerial photographs taken during the period 1943-1994. In this watershed, which covers 4Á5 km 2 of mountainous terrain in San Pedro County, central Chile, the area of native forest species decreased from 70 per cent in 1943 to 13 per cent in 1994. During this same period, the area of pine plantations increased from 4 to 46 per cent. To study effects of these changes, we took a core from the centre of the lake and estimated sedimentation rates by 210 Pb dating, which we checked with 137 Cs and pine pollen. The results show that sedimentation rate ranged from 5 mg cm À2 a À1 in the late 1800s to 60 mg cm À2 a À1 in the late 1960s. These rates, together with assumptions about the production and delivery of the sediment, give corresponding figures for sediment yields with maximum values close to 1 t ha À1 a À1 . Sediment yield between 1955 and 1994 closely tracks the total land use change that can be detected, irrespective of land use type, on sets of aerial photographs taken four to 18 years apart. However, this measure of land use change, while convenient and successful as a predictor of historical erosion, may be unreliable because it probably excludes many changes that occurred in long intervals between successive photographs.

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Natural (210Pb, 7Be) and fallout (137Cs, 239,240Pu, 90Sr) radionuclides as geochemical tracers of sedimentation in Greifensee, Switzerland

Cited by 142 publications

References 19 publications

Sedimentation rates in the central lake constance determined with210Pb and137Cs

Sedimentation rates in the central lake constance determined with210Pb and137Cs

The biogeochemistry of 210Pb and 210Po in fresh waters and sediments

Effects of historical land use on sediment yield from a lacustrine watershed in central Chile

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