Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Full text
Author(s):
Show less -
Bahr, A. [1] ; Kaboth-Bahr, S. [1, 2] ; Jaeschke, A. [3] ; Chiessi, C. [4] ; Cruz, F. [5] ; Carvalho, L. [6] ; Rethemeyer, J. [3] ; Schefuss, E. [7] ; Geppert, P. [1] ; Albuquerque, A. L. [5, 8] ; Pross, J. [1] ; Friedrich, O. [1]
Total Authors: 12
Affiliation:
[1] Heidelberg Univ, Inst Earth Sci, Heidelberg - Germany
[2] Univ Potsdam, Inst Earth Sci, Potsdam - Germany
[3] Univ Cologne, Inst Geol & Mineral, Cologne - Germany
[4] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil
[5] Univ Sao Paulo, Inst Geosci, Sao Paulo - Brazil
[6] Univ Calif Santa Barbara, Dept Geog & Earth Res Inst, Santa Barbara, CA - USA
[7] Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen - Germany
[8] Univ Fed Fluminense, Dept Geoquim, Niteroi, RJ - Brazil
Total Affiliations: 8
Document type: Journal article
Source: PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY; v. 36, n. 9 SEP 2021.
Web of Science Citations: 0
Abstract

Historic droughts document the strong spatio-temporal variability of the South American Monsoon System, which currently provides more than two thirds of the rainfall in tropical South America. The drivers of this variability have remained not well understood due to the lack of continuous, high-resolution paleorecords, especially from the more arid regions of tropical South America. Here we present a novel record of moisture availability across eastern South America for the past similar to 5,000 years from a sediment core retrieved off eastern Brazil. We document distinct decadal- to millennial-scale spatial shifts of major atmospheric convection centers that caused increasingly pronounced droughts in eastern South America over the past similar to 2,000 years. These fluctuations were triggered by climate anomalies in the high northern latitudes and propagated into equatorial latitudes via fluctuations in North Atlantic Overturning Circulation strength. As global warming is expected to decrease oceanic overturning due to enhanced meltwater input into the North Atlantic while at the same time reducing precipitation over eastern South America, an increasing risk for long-lasting droughts can be expected for this region, posing severe socio-economic challenges. (AU)

FAPESP's process: 18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM)
Grantee:Cristiano Mazur Chiessi
Support Opportunities: Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2
FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
Grantee:Francisco William da Cruz Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/24349-9 - Assessing the effects of past and future climate change on Amazonian biodiversity (CLAMBIO)
Grantee:Cristiano Mazur Chiessi
Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants