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The Thermohaline Circulation and Climate Change Michael P. Erb The Thermohaline Circulation Younger Dryas Glacial Lake Agassiz “Simulated Tropical Response to a Substantial Weakening of the Atlantic Thermohaline Circulation” – Zhang & Delworth 2005 Journal of Climate Climate Model Experiment: an extra freshwater forcing of 0.6 Sv (1 Sv = 106 m3s-1) is uniformly distributed over the North Atlantic for 60 years “Simulated Tropical Response to a Substantial Weakening of the Atlantic Thermohaline Circulation” – Zhang & Delworth 2005 Journal of Climate Climate Model Experiment: an extra freshwater forcing of 0.6 Sv (1 Sv = 106 m3s-1) is uniformly distributed over the North Atlantic for 60 years Plate Tectonics can affect the Thermohaline Circulation, too. Around 3 million years ago the Isthmus of Panama formed, cutting off the mixing of water between the Atlantic and Pacific and forcing ocean circulations to reorganize. Professional Papers • Haug, G. H., and R. Tiedemann, 1998. Effect of the formation of the Isthmus of Panama on Atlantic Ocean thermohaline circulation. Nature, 393, 673-676. • Teller, J. T., D. W. Leverington, and J. D. Mann, 2002. Freshwater outbursts to the oceans from glacial Lake Agassiz and their role in climate change during the last deglaciation. Quaternary Science Reviews, 21, 879-887. • Weaver, A. J., O. A. Saenko, P. U. Clark, and A. X. Mitrovika, 2003. Meltwater Pulso 1A from Antarctica as a Trigger of the Bolling-Allerod Warm Interval. Science, 299, 1709-1713. • Zhang, R., and T. L. Delworth, 2005. Simulated Tropical Response to a Substantial Weakening of the Atlantic Thermohaline Circulation. Journal of Climate, 18, 18531860.