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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 10 | Copyright
Clim. Past, 11, 1375-1393, 2015
https://doi.org/10.5194/cp-11-1375-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Oct 2015

Research article | 14 Oct 2015

Late-glacial to late-Holocene shifts in global precipitation δ18O

S. Jasechko2,1, A. Lechler3, F. S. R. Pausata4, P. J. Fawcett1, T. Gleeson5, D. I. Cendón6, J. Galewsky1, A. N. LeGrande7, C. Risi8, Z. D. Sharp1, J. M. Welker9, M. Werner10, and K. Yoshimura11 S. Jasechko et al.
  • 1Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico, USA
  • 2Department of Geography, University of Calgary, Calgary, Alberta, Canada
  • 3Department of Geosciences, Pacific Lutheran University, Tacoma, USA
  • 4Department of Meteorology and Bolin Center for Climate Research, Stockholm University, Stockholm, Sweden
  • 5Department of Civil Engineering, University of Victoria, Victoria, Canada
  • 6Australian Nuclear Science and Technology Organisation, Sydney, Australia
  • 7NASA Goddard Institute for Space Studies, New York, USA
  • 8Laboratoire de Météorologie Dynamique, IPSL, UPMC, CNRS, Paris, France
  • 9Department of Biological Sciences, University of Alaska Anchorage, Anchorage, Alaska, USA
  • 10Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 11Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan

Abstract. Reconstructions of Quaternary climate are often based on the isotopic content of paleo-precipitation preserved in proxy records. While many paleo-precipitation isotope records are available, few studies have synthesized these dispersed records to explore spatial patterns of late-glacial precipitation δ18O. Here we present a synthesis of 86 globally distributed groundwater (n = 59), cave calcite (n = 15) and ice core (n = 12) isotope records spanning the late-glacial (defined as ~ 50 000 to ~ 20 000 years ago) to the late-Holocene (within the past ~ 5000 years). We show that precipitation δ18O changes from the late-glacial to the late-Holocene range from −7.1 ‰ (δ18Olate-Holocene > δ18Olate-glacial) to +1.7 ‰ (δ18Olate-glacial > δ18Olate-Holocene), with the majority (77 %) of records having lower late-glacial δ18O than late-Holocene δ18O values. High-magnitude, negative precipitation δ18O shifts are common at high latitudes, high altitudes and continental interiors (δ18Olate-Holocene > δ18Olate-glacial by more than 3 ‰). Conversely, low-magnitude, positive precipitation δ18O shifts are concentrated along tropical and subtropical coasts (δ18Olate-glacial > δ18Olate-Holocene by less than 2 ‰). Broad, global patterns of late-glacial to late-Holocene precipitation δ18O shifts suggest that stronger-than-modern isotopic distillation of air masses prevailed during the late-glacial, likely impacted by larger global temperature differences between the tropics and the poles. Further, to test how well general circulation models reproduce global precipitation δ18O shifts, we compiled simulated precipitation δ18O shifts from five isotope-enabled general circulation models simulated under recent and last glacial maximum climate states. Climate simulations generally show better inter-model and model-measurement agreement in temperate regions than in the tropics, highlighting a need for further research to better understand how inter-model spread in convective rainout, seawater δ18O and glacial topography parameterizations impact simulated precipitation δ18O. Future research on paleo-precipitation δ18O records can use the global maps of measured and simulated late-glacial precipitation isotope compositions to target and prioritize field sites.

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In this study we compile global isotope proxy records of climate changes from the last ice age to the late-Holocene preserved in cave calcite, glacial ice and groundwater aquifers. We show that global patterns of late-Pleistocene to late-Holocene precipitation isotope shifts are consistent with stronger-than-modern isotopic distillation of air masses during the last ice age, likely impacted by larger global temperature differences between the tropics and the poles.
In this study we compile global isotope proxy records of climate changes from the last ice age...
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