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• W2184718212 abstract "Intensive sedimentation took place in the lakes in Holocene and continues till present (Общие..., 1986; Lietuvos..., 1991). It is especially intensive in the central parts of lakes where in about 10 000 years a 12–18 m thick layer of lake sediments has developed. Consecutive analysis of the sediment cores by radioisotope methods and supporting hydrometeorological data can be used as a tool revealing paleoclimatic and paleoecological changes that have taken place in the lakes catchment. Studies of lake and marine sedimentation by the Pb method have been carried out in many regions of the world (Krishnaswami et al., 1971; Koide, Bruland, Goldberg, 1973; Robbins, Edgington, 1975; Robbins, 1982; Bollhofer et al., 1997; Mažeika, DusauskienėDuž, Radzevicius, 2004). This method is often combined with cesium-137 (Cs) and sometimes with radiocarbon (C) studies. The Pb in lake sediments is of double origin. Part of Pb forms in situ as a result of Ra decay. This part (supported) is determined by radioactive equilibrium with Pb parent isotopes – Pb and Bi. The other part of Pb is non-equilibrium or unsupported (Pb excess – unsupported) and is used for dating. It forms while burning the fossil organic fuel and gets into water systems as a result of rapid atmospheric transport and deposition of Pb originated from Ra decay products. Two chronologically linked events predetermine the distribution of Cs in lake sediments – deposition of Cs after the accident in the Chernobyl NPP in 1986 and global fall-outs of Cs (with their maximum in 1963–1964) as a result of nuclear bombs testing in the atmosphere. Processes of sedimentation in the lakes Drūksiai, Baltys, Lydekis, Glėbas, and Varėnis located in the eastern part of Lithuania (Baltic Upland) were investigated by radioisotope methods (Fig. 1). Two of investigated lakes (Baltys and Glėbas) have no tributaries and are endoheic. They are fed by groundwater base flow from forested anthropogenically almost undisturbed catchments. Rivers with comparable catchments flow across the Varėnis and Lydekis lakes. Part of their catchments is used in agriculture. The Lake Drūksiai catchment is also used in agriculture but the regulation of its runoff in the 20th century and operation of Ignalina NPP were the factors, which produced the greatest effect on it. The results obtained by radioisotope dating have been compared with the average annual mass of sediments measured using sediment traps." @default.
• W2184718212 created "2016-06-24" @default.
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• W2184718212 date "2005-01-01" @default.
• W2184718212 modified "2023-09-27" @default.
• W2184718212 title "EVALUATION OF RECENT SEDIMENTATION RATES IN THE LAKES OF EAST LITHUANIA BASED ON RADIOISOTOPE DATING" @default.
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