Journal article

Zonally symmetric changes in the strength and position of the Southern Westerlies drove atmospheric CO2 variations over the past 14 k.y.

M-S Fletcher, PI Moreno

Geology | GEOLOGICAL SOC AMER, INC | Published : 2011

Abstract

Terrestrial records from 41 to 52°S across the Southern Hemisphere reveal nearly synchronous multimillennial trends in moisture derived from the Southern Westerly Winds (SWW) since 14 ka, pointing to a marked zonal symmetry in SWW changes across a broad swath of the southern middle latitudes. The data suggest a southward shift of the SWW that coincided with a rapid atmospheric CO2 rise starting ca. 12.5 ka, a widespread decline in SWW strength between ca. 10 and 7 ka contemporaneous with an ~8 ppm reversal in the deglacial atmospheric CO2 rise, followed by stronger SWW and a steady multimillennial increase in CO2 until the preindustrial maximum. We conclude that zonally symmetric changes in ..

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University of Melbourne Researchers

Grants

Awarded by Fondecyt


Awarded by Iniciativa Cientifica Milenio


Funding Acknowledgements

Fletcher is funded by the Institute of Ecology and Biodiversity, Chile, and Moreno is funded by Fondecyt 1070991 and Iniciativa Cientifica Milenio P05-002, contract PFB-23.