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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 1 | Copyright

Special issue: Progress in paleoclimate modelling

Clim. Past, 9, 423-432, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 Feb 2013

Research article | 19 Feb 2013

Proxy benchmarks for intercomparison of 8.2 ka simulations

C. Morrill1,2, D. M. Anderson2, B. A. Bauer2, R. Buckner2,†, E. P. Gille1,2, W. S. Gross2, M. Hartman1,2,†, and A. Shah1,2 C. Morrill et al.
  • 1CIRES, University of Colorado, Boulder, Colorado, USA
  • 2NOAA's National Climatic Data Center, Boulder, Colorado, USA
  • deceased

Abstract. The Paleoclimate Modelling Intercomparison Project (PMIP3) now includes the 8.2 ka event as a test of model sensitivity to North Atlantic freshwater forcing. To provide benchmarks for intercomparison, we compiled and analyzed high-resolution records spanning this event. Two previously-described anomaly patterns that emerge are cooling around the North Atlantic and drier conditions in the Northern Hemisphere tropics. Newer to this compilation are more robustly-defined wetter conditions in the Southern Hemisphere tropics and regionally-limited warming in the Southern Hemisphere. Most anomalies around the globe lasted on the order of 100 to 150 yr. More quantitative reconstructions are now available and indicate cooling of ~ 1 °C and a ~ 20% decrease in precipitation in parts of Europe as well as spatial gradients in δ18O from the high to low latitudes. Unresolved questions remain about the seasonality of the climate response to freshwater forcing and the extent to which the bipolar seesaw operated in the early Holocene.

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