Cooling of the southern high latitudes during the Medieval Period and its 
effect on ENSO

Mohtadi, M.; Romero, O. E.; Kaiser, J.; Hebbeln, D.; 5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

doi:doi:10.1016/j.quascirev.2006.12.008

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Cooling of the southern high latitudes during the Medieval Period and its effect on ENSO

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Mohtadi, M.
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Romero, O. E.
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Kaiser, J.
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Hebbeln, D.
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Mohtadi, M., Romero, O. E., Kaiser, J., Hebbeln, D. (2007): Cooling of the southern high latitudes during the Medieval Period and its effect on ENSO. - Quaternary Science Reviews, 26, 7-8, 1055-1066.
https://doi.org/doi:10.1016/j.quascirev.2006.12.008

https://gfzpublic.gfz-potsdam.de/pubman/item/item_235337

Zusammenfassung

A high-resolution multiproxy study performed on a marine record from SE Pacific off southern South America was used to reconstruct past regional environmental changes and their relation to global climate, particularly to El Niño/Southern Oscillation (ENSO) phenomenon during the last 2200 years. Our results suggest a sustained northward shift in the position of the zonal systems, i.e. the Southern Westerly Wind belt and the Antarctic Circumpolar Current, which occurred between 1300 and 750 yr BP. The synchrony of the latitudinal shift with cooling in Antarctica and reduced ENSO activity observed in several marine and terrestrial archives across South America suggests a causal link between ENSO and the proposed displacement of the zonal systems. This shift might have acted as a positive feedback to more La Niña-like conditions between 1300 and 750 yr BP by steepening the hemispheric and tropical Pacific zonal sea surface temperature gradient. This scenario further suggests different boundary conditions for ENSO before 1300 and after 750 yr BP.