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    Temporal Changes of the 14C Reservoir Effect in Lakes

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    Author
    Geyh, Mebus A.
    Schotterer, U.
    Grosjean, M.
    Issue Date
    1998-01-01
    Keywords
    runoff
    lake level changes
    Atacama Desert
    Lake Prosyr
    Legia Lake
    Plitvice National Park
    reservoirs
    Schleinsee Lake
    fresh water environment
    lakes
    effects
    depth
    water hardness
    Chile
    dissolved materials
    inorganic materials
    temporal distribution
    sedimentation
    sedimentation rates
    terrestrial environment
    Croatia
    ground water
    clastic rocks
    marl
    seasonal variations
    Germany
    accuracy
    atmosphere
    South America
    Southern Europe
    Holocene
    Central Europe
    Pleistocene
    Europe
    sediments
    Cenozoic
    Quaternary
    wood
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    carbon dioxide
    absolute age
    sedimentary rocks
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    Citation
    Geyh, M. A., Schotterer, U., & Grosjean, M. (1998). Temporal changes of the 14C reservoir effect in lakes. Radiocarbon, 40(2), 921-931.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.
    URI
    http://hdl.handle.net/10150/654648
    DOI
    10.1017/S0033822200018890
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Conventional radiocarbon dates for sediment samples from aquatic systems and of coeval terrestrial samples deviate from each other due to the reservoir effect. The reservoir correction is usually assumed to be constant with time for a specific aquatic system. Our studies confirm that seasonal and secular changes are frequent and are governed by the limnological conditions. Lakes have two principal sources of 14C: atmospheric CO2 and the total dissolved inorganic carbon (TDIC) of the entering groundwater and runoff. The former has values of ca. 100 pMC; the latter usually has a 14C value well below 100 pMC. Atmospheric CO2 enters the lake by exchange via its surface. The proportions of these two kinds of input determine the magnitude of the reservoir correction in freshwater lakes. It is mainly a function of the volume/surface ratio of the lake and, consequently a function of the water depth. The surface of lakes with outflow does not change when sedimentation decreases the depth of the water. The depth of Schleinsee Lake in southern Germany has decreased from 30 to 15 m since ca. 9000 BP. As a result, the reservoir correction has decreased from ca. -1550 to -580 yr. In contrast, the depth of Lake Proscansko in Croatia increased with growth of the travertine dam and the reservoir correction changed from ca. -1790 to -2650 yr during the last 8800 yr. The largest fluctuations of lake levels occur in closed lakes in arid regions when the climate changes from humid to arid and vice versa. As a result, the reservoir correction of the 14C dates for the total organic fraction from Lejía Lake in the Atacama Desert of Chile varied between <-1800 yr and -4700 yr over a period of only 1800 yr between 11,500 and 9700 BP. The corresponding reservoir correction for the marl fraction is much higher. In summary, accurate and reliable 14C dating of lake sediments requires a study of the temporal changes of the reservoir effect by analysis of both the organic and marl fractions. The most reliable 14C dates are obtained from terrestrial plant remains.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200018890
    Scopus Count
    Collections
    Radiocarbon, Volume 40, Number 2 (1998)

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