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  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, 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, 45809.
https://doi.org/10.1038/srep45809

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Lechleitner, F. A.1, Author
Breitenbach, S. F. M.1, Author
Rehfeld, K.1, Author
Ridley, H. E.1, Author
Asmerom, Y.1, Author
Prufer, K. M.1, Author
Marwan, Norbert2, Author              
Goswami, Bedartha2, Author              
Kennett, D. J.1, Author
Aquino, V. V.1, Author
Polyak, V.1, Author
Haug, G. H.1, Author
Eglinton, T. I.1, Author
Baldini, J. U. L.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: 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.

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 Dates: 2017
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/srep45809
PIKDOMAIN: Transdisciplinary Concepts & Methods - Research Domain IV
eDoc: 7624
Research topic keyword: Paleoclimate
Research topic keyword: Extremes
Research topic keyword: Monsoon
Research topic keyword: Climate impacts
Model / method: Nonlinear Data Analysis
Regional keyword: South America
Organisational keyword: RD4 - Complexity Science
Working Group: Development of advanced time series analysis techniques
 Degree: -

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Title: Scientific Reports
Source Genre: Journal, SCI, Scopus, p3, OA
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Pages: - Volume / Issue: 7 Sequence Number: 45809 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals2_395