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@ARTICLE{Kock:861319,
      author       = {Kock, Sebastian and Schittek, Karsten and Wissel, Holger
                      and Vos, Heinz and Ohlendorf, Christian and Schäbitz, Frank
                      and Lupo, Liliana C. and Kulemeyer, Julio J. and Lücke,
                      Andreas},
      title        = {{S}table {O}xygen {I}sotope {R}ecords (δ18{O}) of a
                      {H}igh-{A}ndean {C}ushion {P}eatland in {NW} {A}rgentina
                      (24° {S}) {I}mply {S}outh {A}merican {S}ummer {M}onsoon
                      {R}elated {M}oisture {C}hanges {D}uring the {L}ate
                      {H}olocene},
      journal      = {Frontiers in Earth Science},
      volume       = {7},
      issn         = {2296-6463},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2019-01809},
      pages        = {45},
      year         = {2019},
      abstract     = {High-elevation cushion peatlands are promising archives for
                      paleoenvironmental studies in their extreme habitat of the
                      Central Andean highlands between ~4000 and 4800m a.s.l. The
                      Cerro Tuzgle cushion peatland (CTP, 24°09’ S, 66°24’
                      W), located in the NW Argentine Andes, is formed by the
                      vascular cushion plants Oxychloe andina (O. andina) and
                      Zameioscirpus muticus (Z. muticus). To extend the knowledge
                      base on the modern ecology of these peatlands, we
                      investigated the stable isotope composition of bulk material
                      and cellulose (δ18O, δ13C, δ15N) of the dominant
                      cushion-forming species O. andina (Juncaceae) and Z. muticus
                      (Cyperaceae) as well as water samples (δ18O, δ2H) of
                      several pools interspersed within the peatland. We further
                      applied a multiproxy approach for a peat core from CTP
                      spanning the last 2900 years with XRF scanning, bulk
                      geochemistry and stable isotope analyses on bulk peat and
                      cellulose size fractions. Modern samples of O. andina and Z.
                      muticus expose significant differences in cellulose δ18O
                      e.g. between leaves and rhizomes of O. andina (Δδ18Ol-r =
                      4.11‰) and between leaves of O. andina and Z. muticus
                      (Δδ18Ol-l = 2.8‰). Modern water samples exhibit strong
                      isotopic differences between single water pools (max.
                      Δδ18O = 13.09‰) due to local variable evaporative
                      enrichment. Within the peat core, we observe considerable
                      multi-centennial variations in δ18O composition of
                      cellulose confirmed by all size fractions. Based on the
                      regional relation between decreasing δ18Oprec values with
                      increasing precipitation amounts and 18O enrichment in the
                      peatland waters due to evaporation, we suggest an
                      interpretation of our δ18O cellulose record as moisture
                      proxy for CTP. This interpretation is corroborated by a high
                      correlation between oxygen isotopes, peat growth and
                      geochemical data. Accordingly, CTP indicates dryer
                      conditions between 2190 and 2120, 1750 and 1590, 1200 and
                      1080 and since 130 cal. yr BP, whereas periods with
                      increased humidity prevailed from 2750 to 2250 and from 600
                      to 130 cal. yr BP. Temporal changes in the match to South
                      American Summer Monsoon (SASM) reconstructions suggest
                      impacts of other large-scale atmospheric variability modes
                      or a different SASM expression at our southerly location.},
      cin          = {IBG-3 / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / 244 - Composition and dynamics of the upper
                      troposphere and middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000467233300001},
      doi          = {10.3389/feart.2019.00045},
      url          = {https://juser.fz-juelich.de/record/861319},
}