Tropical rainfall over the last two millennia: evidence for a low-latitude 
hydrologic seesaw

Lechleitner, F. A.; Breitenbach, S. F. M.; Rehfeld, K.; Ridley, H. E.; Asmerom, Y.; Prufer, K. M.; Marwan, Norbert; Goswami, Bedartha; Kennett, D. J.; Aquino, V. V.; Polyak, V.; Haug, G. H.; Eglinton, T. I.; Baldini, J. U. L.

doi:10.1038/srep45809

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学術論文

Tropical rainfall over the last two millennia: evidence for a low-latitude hydrologic seesaw

Authors

Lechleitner, F. A.
External Organizations;

Breitenbach, S. F. M.
External Organizations;

Rehfeld, K.
External Organizations;

Ridley, H. E.
External Organizations;

Asmerom, Y.
External Organizations;

Prufer, K. M.
External Organizations;

/persons/resource/Marwan

Marwan, Norbert
Potsdam Institute for Climate Impact Research;

/persons/resource/goswami

Goswami, Bedartha
Potsdam Institute for Climate Impact Research;

Kennett, D. J.
External Organizations;

Aquino, V. V.
External Organizations;

Polyak, V.
External Organizations;

Haug, G. H.
External Organizations;

Eglinton, T. I.
External Organizations;

Baldini, J. U. L.
External Organizations;

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引用

Lechleitner, F. A., Breitenbach, S. F. M., Rehfeld, K., Ridley, H. E., Asmerom, Y., Prufer, K. M., Marwan, N., Goswami, B., Kennett, D. J., Aquino, V. V., Polyak, V., Haug, G. H., Eglinton, T. I., & Baldini, J. U. L. (2017). Tropical rainfall over the last two millennia: evidence for a low-latitude hydrologic seesaw. Scientific Reports, 7:. doi:10.1038/srep45809.

引用: https://publications.pik-potsdam.de/pubman/item/item_21676

要旨

The presence of a low- to mid-latitude interhemispheric hydrologic seesaw is apparent over orbital and glacial-interglacial timescales, but its existence over the most recent past remains unclear. Here we investigate, based on climate proxy reconstructions from both hemispheres, the inter-hemispherical phasing of the Intertropical Convergence Zone (ITCZ) and the low- to mid-latitude teleconnections in the Northern Hemisphere over the past 2000 years. A clear feature is a persistent southward shift of the ITCZ during the Little Ice Age until the beginning of the 19th Century. Strong covariation between our new composite ITCZ-stack and North Atlantic Oscillation (NAO) records reveals a tight coupling between these two synoptic weather and climate phenomena over decadal-to-centennial timescales. This relationship becomes most apparent when comparing two precisely dated, high-resolution paleorainfall records from Belize and Scotland, indicating that the low- to mid-latitude teleconnection was also active over annual-decadal timescales. It is likely a combination of external forcing, i.e., solar and volcanic, and internal feedbacks, that drives the synchronous ITCZ and NAO shifts via energy flux perturbations in the tropics.