Record details

Title
    Reconstruction of palaeoclimatic changes in Central Europe between 10 and 200 thousand years BP, based on analysis of growth frequency of speleothems
Statement of responsibility
    Helena Hercman
Author
    Hercman, Helena
Language
    anglicky
Source title - serial
    Studia quaternaria
Vol./nr.
    Vol. 17
Pages
    p. 35-70
Year
    2000
Notes
    38 obr., 10 tab., 3 s.bibl.
    il.
    Zkr. název ser.: Stud. quat. (Warszawa).
Subject group
    datování C14
    datování Th/U
    distribuce četnosti
    glaciály
    jeskyně
    kalcit
    krystalizace
    kvartér Českého masivu
    metoda grafická
    paleoklimatologie
    pleistocén
    pohoří
    speleotém
    změna klimatu
Geographical name
    ČR-Morava
    Evropa západní
    Moravský kras
    Polsko
    Slovensko
    USA-Nevada
Keyword
    10
    200
    Analysis
    Based
    BP
    Central
    Changes
    Europe
    Frequency
    Growth
    Palaeoclimatic
    Reconstruction
    Speleothems
    Thousand
    Years
Abstract (in english)
   The present study is an attempt to utilise the uranium-thorium dates of speleothems as a source of palaeoclimatic data. The clue is that the changing climate influenced intensity of speleothem deposition, which is reflected in clustering of U-series dates of speleothems in certain time intervals. This work discussed and improves various methods of combined presentation of dates, with a special attention to the presentation in form of growth frequency ('pdf') curves. Using the 'bootstrap' method the confidence intervals of the 'pdf' curves could be determined. Also the algorithm, originally developed to determine parameters of arbitrarily chosen maxima in the curve, has been modified. Due to that an assessment of number of maxima has been possible. this method enables objective distinction of phases of speleothem growth, which cannot be done 'by eye' when the 'pdf' curve is smooth. The statistical tests show that the reliable 'pdf' curve should contain more than 150 dates.
   Basinf on 308 U-series dates of cave speleothems from southern Poland and other regions of central Europe, the growth frequency curves for the Carpathians and Uplands have been constructed. Comparison of phases of speleothem growth, distinguished by various authors for several regions of Europe, indicates that the climatic changes were synchronous over the whole region. However, different shapes of the 'pdf' curves reflect increasing continuity of speleothem growths in the N-S transect southwards. This may be connected with the N-S climatic gradient in Europe
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012