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@ARTICLE{Fey:6422,
      author       = {Fey, M. and Korr, C. and Maidana, N. I. and Carrevedo, M.L.
                      and Dietrich, S. and Corbella, H. and Haberzettl, T. and
                      Kuhn, G. and Lücke, A. and Mayr, C. and Ohlendorf, C. and
                      Schäbitz, F. and Zolitschka, B.},
      title        = {{P}alaeoenvironmental changes during the last 1600 years
                      inferred from the sediment record of a cirque lake in
                      southern {P}atagonia ({L}aguna {L}as {V}izcachas,
                      {A}rgentina)},
      journal      = {Palaeogeography, palaeoclimatology, palaeoecology},
      volume       = {281},
      issn         = {0031-0182},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-6422},
      year         = {2009},
      note         = {The authors would like to express their thanks to the owner
                      of Estancia Las Vizcachas for permitting access to the lake.
                      The staff of INTA, Rio Gallegos are acknowledged for their
                      assistance in organizing the logistics of the field work. We
                      thank Sabine Stahl for assistance with sampling and
                      geochemical analyses. We are much obliged to Thomas
                      Frederichs and Christian Hilgenfeldt (Department of Marine
                      Geophysics, University of Bremen) for access to their
                      magnetic susceptibility measuring bench. Stephanie Janssen
                      and Michael Wille are acknowledged for inspiring discussions
                      and excellent collaboration in the SALSA-team. We thank
                      Daniel Ariztegui and an anonymous reviewer for valuable
                      comments on an earlier version of the manuscript. An
                      anonymous language editor is acknowledged for improvements
                      in language and style of the English text. This is a
                      contribution to the project "South Argentinean Lake Sediment
                      Archives and modeling" (SALSA) within the framework of the
                      German Climate Research Program DEKLIM (grants 01 LD 0034
                      and 0035) of the German Federal Ministry of Education and
                      Research (BMBF). Additional financial support was provided
                      by the German Science Foundation (DFG) in the framework of
                      the Priority Program 'ICDP' (grant ZO 102/5-1, 2, 3).},
      abstract     = {Laguna Las Vizcachas is a cirque lake located at the margin
                      of an extra-Andean volcanic plateau in southern Patagonia,
                      Argentina, within the area of steppe and semi-desert east of
                      the Andes. The number of paleoenvironmental records is still
                      limited in this region. Sediments of this lake were studied
                      in order to obtain multi-proxy information about the
                      paleoenvironmental history of this site for the 'Medieval
                      Climate Anomaly' and the 'Little Ice Age' chronozones. In
                      combination with results from other sites across southern
                      Patagonia, our data enhance the understanding of spatial
                      patterns of past hydrological changes and contribute to
                      distinguishing between the signals of temperature and
                      precipitation. As Laguna Las Vizcachas is situated at 1100 m
                      a.s.l. in a cool 'mountain climate', the lake system is more
                      sensitive to changes of temperature and winter ice cover
                      than other sites from lower elevations in this region. Our
                      interpretation of the multi-proxy dataset is based on
                      signals of clastic sediment input, lake productivity,
                      organic matter sources and preservation, dilution effects
                      and early diagenetic overprint. The record reveals a period
                      of enhanced fluvial runoff resulting from higher
                      precipitation from the 12th until the end of the 14th
                      century as inferred from high concentrations of Ti, Ca, and
                      from magnetic susceptibility. This may coincide with higher
                      wind intensities as suggested by higher proportions of
                      epiphytic diatoms which point to an enhanced lateral
                      transport from their littoral habitat towards the coring
                      position at the center of the lake. in comparison with other
                      records from southern Patagonia, the results from Laguna Las
                      Vizcachas suggest opposite precipitation regimes between the
                      western and eastern parts of Patagonia during that time
                      which corresponds partly to the 'Medieval Climate Anomaly'
                      chronozone. However, this proposal is compromised by the
                      chronological uncertainties of the different records under
                      consideration. The diatom record of Laguna Las Vizcachas
                      indicates temperature changes: highest proportions of
                      benthic diatoms point to coldest conditions from the
                      mid-15th until the mid-17th century, followed by relatively
                      warm conditions until the mid-18th century as suggested by a
                      decrease of benthic taxa and a conspicuous rise of the
                      planktonic/non-planktonic diatom ratio that can be used as
                      an indicator for the length or presence/absence of winter
                      ice cover. (C) 2009 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geography, Physical / Geosciences, Multidisciplinary /
                      Paleontology},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000271364500015},
      doi          = {10.1016/j.palaeo.2009.01.012},
      url          = {https://juser.fz-juelich.de/record/6422},
}