ISSN:
1573-5117
Schlagwort(e):
lead-210 dating
;
natural sediment marker
;
sediment traps
;
sediment accumulation
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract Methods to provide accurate accumulation rates for lake models are discussed. Cores were taken in 1979 in two basins of Lake Lucerne, Switzerland, and accumulation rates were calculated by using Pb-210 dating and by a natural landslide marker of 1795 in one basin (Weggis). In the other basin (Horw Bay) the sediment accumulation rates based on the lead method were compared with yearly sedimentation rates measured by sediment traps in 1969/70. At the Weggis station, the core dating yielded sediment accumulation rates of about 400 g dry wt. m−2 y−1 with the lead method, averaged over a sediment depth of 4–20 cm; accumulation was about 700 g dry wt. m−2 y−1 with the marker method, averaged over 0–33 cm. In Horw Bay, the trap method yielded about 1300 g dry wt. M−2 y−1 compared with 400–1000 g dry wt. m−2 y−1 obtained with the lead method and related to various depth intervals. The characteristic sources of error of the three methods as well as several hypotheses for these discrepancies are discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00940146
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