Coupling of the Intertropical Convergence Zone and Southern Hemisphere mid-latitude climate during the early to mid-Holocene
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Date
2017-10-27
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Geological Society of America
Abstract
Conceptual models predict a tight coupling between the Intertropical Convergence Zone (ITCZ) and the Southern Westerly Winds (SWW) in response to glacial-interglacial transitions, yet little is known about this relationship under Holocene boundary conditions. Here we present a synthesis of Holocene pollen data from the southwest Pacific mid-latitudes that tracks changes in the SWW. Comparison of our SWW paleoclimate records with data tracking the ITCZ, oceanic circulation, and insolation reveals clearly synchronous and in-phase ITCZ-SWW dynamics between 12 and 5 ka, indicating a tight coupling between the tropics and southern mid-latitudes in response to ocean circulation and insolation. An apparent decoupling of the SWW and ITCZ in the Pacific region after 5 ka is attributable to the overriding influence of the El Niño-Southern Oscillation (ENSO) over the proxy data. © 2017 Geological Society of America
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Keywords
Pollen, Precipitation, Tasmania, Australia, Sediments, Southern Oscillation, Climatic change, Carbon, Drill cores, Fires, Charcoal, Quaternary Period, Tropical Regions, Southern Hemisphere, Pacific Ocean, Glaciers, Isotopes, Wind, Plants
Citation
Mariani, M., Fletcher, M.-S., Drysdale, R. N., Saunders, K. M., Heijnis, H., Jacobsen, G., & Zawadzki, A. (2017). Coupling of the Intertropical Convergence Zone and Southern Hemisphere mid-latitude climate during the early to mid-Holocene. Geology, 45(12), 1083-1086. doi:10.1130/g39705.1