Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw
Lechleitner, Franziska A.
Breitenbach, Sebastian F.M.
Ridley, Harriet E.
Prufer, Keith M.
Kennett, Douglas J.
Aquino, Valorie V.
Haug, Gerald H.
Eglinton, Timothy I.
Baldini, James U.L.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
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. Show more
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Journal / seriesScientific Reports
Pages / Article No.
PublisherNature Publishing Group
SubjectNORTH-ATLANTIC CLIMATE; INTERTROPICAL CONVERGENCE ZONE; COMMON ERA; ICE-AGE; VOLCANIC-ERUPTIONS; PAST MILLENNIUM; HIGH-RESOLUTION; MONSOON RECORD; VARIABILITY; CAVE
Organisational unit03775 - Haug, Gerald H. / Haug, Gerald H.
03868 - Eglinton, Timothy I. / Eglinton, Timothy I.
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