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Copyright Copernicus GmbH 2013

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 δ18 O 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.

Details

Title
Proxy benchmarks for intercomparison of 8.2 ka simulations
Author
Morrill, C.; Ander son, D. M.; Bauer, B. A.; Buckner, R.; Gille, E. P.; Gross, W. S.; Hartman, M.; Shah, A.
First page
423
Publication year
2013
Publication date
2013
Publisher
Copernicus GmbH
ISSN
18149324
e-ISSN
18149332
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1315212836
Copyright
Copyright Copernicus GmbH 2013