Proxy benchmarks for intercomparison of 8.2 ka simulations

Morrill, C.; Anderson, D. M.; Bauer, B. A.; Buckner, R.; Gille, E. P.; Gross, W. S.; Hartman, M.; Shah, A.
July 2012
Climate of the Past Discussions;2012, Vol. 8 Issue 4, p3765
Academic Journal
The Paleoclimate Modeling Intercomparison Project (PMIP3) now includes the 8.2 ka events 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 1.0 to 1.2 °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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