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@ARTICLE{Zhu:186065,
      author       = {Zhu, J. and Lücke, A. and Wissel, H. and Mayr, C. and
                      Enters, D. and Ja Kim, K. and Ohlendorf, C. and Schäbitz,
                      F. and Zolitschka, B.},
      title        = {{C}limate history of the {S}outhern {H}emisphere
                      {W}esterlies belt during the last glacial-interglacial
                      transition revealed from lake water oxygen isotope
                      reconstruction of {L}aguna {P}otrok {A}ike (52° {S},
                      {A}rgentina)},
      journal      = {Climate of the past},
      volume       = {10},
      number       = {6},
      issn         = {1814-9332},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus Ges.},
      reportid     = {FZJ-2015-00166},
      pages        = {2153 - 2169},
      year         = {2014},
      abstract     = {The Southern Hemisphere Westerlies (SHW) play a crucial
                      role in large-scale ocean circulation and global carbon
                      cycling. Accordingly, the reconstruction of how the
                      latitudinal position and intensity of the SHW belt changed
                      during the last glacial termination is essential for
                      understanding global climatic fluctuations. The southernmost
                      part of the South American continent is the only continental
                      mass intersecting a large part of the SHW belt. However, due
                      to the scarcity of suitable palaeoclimate archives
                      continuous proxy records back to the last glacial are rare
                      in southern Patagonia. Here, we show an oxygen isotope
                      record from cellulose and purified bulk organic matter of
                      submerged aquatic moss shoots from Laguna Potrok Aike (52°
                      S, 70° W), a deep maar lake located in semi-arid,
                      extra-Andean Patagonia, covering the last
                      glacial–interglacial transition (26 000 to 8500 cal BP).
                      Based on the highly significant correlation between oxygen
                      isotope values of modern aquatic mosses and their host
                      waters and abundant well-preserved moss remains in the
                      sediment record a high-resolution reconstruction of the lake
                      water oxygen isotope (δ18Olw-corr) composition is
                      presented. The reconstructed δ18Olw-corr values for the
                      last glacial are ca. 3‰ lower than modern values, which
                      can best be explained by generally cooler air temperatures
                      and changes in the moisture source area, together with the
                      occurrence of permafrost leading to a prolonged lake water
                      residence time. Thus, the overall glacial δ18Olw-corr level
                      until 21 000 cal BP is consistent with a scenario of
                      weakened or absent SHW at 52° S compared to the present.
                      During the last deglaciation, reconstructed δ18Olw-corr
                      values reveal a significant two-step rise describing the
                      detailed response of the lake's hydrological balance to this
                      fundamental climatic shift. Rapid warming is seen as the
                      cause of the first rise of ca. $2\&permil,$ in δ18Olw-corr
                      during the first two millennia of deglaciation (17 600 to 15
                      600 cal BP) owing to more 18O enriched precipitation and
                      increasing temperature-induced evaporation. Following this
                      interpretation, an early strengthening of the SHW would not
                      be necessary. The subsequent decrease in δ18Olw-corr by up
                      to 0.7‰ marks a millennial-scale transition period between
                      15 600 and 14 600 cal BP interpreted as the transition from
                      a system driven by temperature-induced evaporation to a
                      system more dominated by wind-induced evaporation. The
                      δ18Olw-corr record resumes its pronounced increase around
                      14 600 cal BP. This further cumulative enrichment in 18O of
                      lake water could be interpreted as response to strengthened
                      wind-driven evaporation as induced by the intensification
                      and establishment of the SHW at the latitude of Laguna
                      Potrok Aike (52° S) since 14 600 cal BP. δ18Olw-corr
                      approaching modern values around 8500 cal BP reflect that
                      the SHW exerted their full influence on the lake water
                      balance at that time provoking a prevailing more arid steppe
                      climate in the Laguna Potrok Aike region.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / 255 - Terrestrial Systems:
                      From Observation to Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000347569500012},
      doi          = {10.5194/cp-10-2153-2014},
      url          = {https://juser.fz-juelich.de/record/186065},
}