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@PHDTHESIS{Parplies:1273,
      author       = {Parplies, Jörn},
      title        = {{I}sotopengeochemische {S}tudien zur klimatischen
                      {A}usprägung des {J}üngeren {D}ryas in terrestrischen
                      {A}rchiven {E}urasiens},
      volume       = {18},
      issn         = {1866-1793},
      school       = {Univ. Köln},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek,
                      Verfasser},
      reportid     = {PreJuSER-1273},
      isbn         = {978-3-89336-542-5},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {XL, 155 S.},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012; Köln, Univ., Diss.,
                      2008},
      abstract     = {In this thesis, the late glacial climate and environment
                      development with special focus on the Younger Dryas
                      chronozone was studied for three different regions in
                      Eurasia. For this purpose, lacustrine sedimentary archives
                      of Lake Meerfelder Maar (Westeifel, Germany), Lake Sacrow
                      (Brandenburg, Germany) and Lake Sihailongwan (NE-China) were
                      investigated by means of isotopic and geochemical methods.
                      Stable isotope ratios of organic carbon, nitrogen and oxygen
                      as well as element contents of organic carbon and nitrogen
                      were measured with high time-resolution. Oxygen isotope
                      ratios of diatomaceous opal (Lake Meerfelder Maar, Lake
                      Sihailongwan) and autochthonous inorganic carbonates (Lake
                      Sacrow) were determined. Separation of diatom valves from
                      bulk sediments was achieved by the method of
                      SPLITT-fractionation for Lake Meerfelder Maar and a newly
                      optimised heavy liquid density centrifugation for Lake
                      Sihailongwan. Determination of oxygen isotope ratios
                      followed the iHTR method and isotope ratio mass spectrometry
                      (IRMS). The late glacial chronozones Bølling / Allerød,
                      Younger Dryas and Preboreal are documented in the sediment
                      profiles of all three investigation sites which basically
                      confirms the hypothesis of a hemispheric character of these
                      climate stages. The Younger Dryas is characterised as a time
                      period of distinct cooling in all three archives. Moreover,
                      an increased allochthonous influx into the sediments is
                      observed for all archives during that time. This is due to a
                      less dense vegetation cover and partly frozen soils during
                      very cold winters. A shortening of the vegetation period
                      associated with an intraannual concentration of lacustrine
                      primary production is inferred from the alignment of
                      $\delta^{18}$O$_{SiO_{2}}$-values of different diatom size
                      fractions from Lake Meerfelder Maar. Oxygen isotope ratios
                      were particularly useful for the reconstruction of climate
                      since they depend directly on climatic driving factors.
                      However, the direct dependence of $\delta^{18}$O-values on
                      lake water temperature during formation of diatoms and
                      carbonates was superimposed by larger variations in the
                      $\delta^{18}$O$_{H_{2}O}$-source value of lake water.
                      Temperature reconstructions based on oxygen isotope
                      variations suggest a decrease of weighted mean annual
                      temperatures in Central Europe in the range of approx. 4.5
                      – 6.5 °C during the Younger Dryas. Since precipitation
                      most likely occurred mainly during spring and summer, the
                      weighted signal is [...]},
      cin          = {ICG-5},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB143},
      pnm          = {ohne FE},
      pid          = {G:(DE-Juel1)FUEK307},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/1273},
}