Universität zu Köln

Bahr, A., Kaboth-Bahr, S., Jaeschke, A., Chiessi, C., Cruz, F., Carvalho, L., Rethemeyer, J., Schefuss, E., Geppert, P., Albuquerque, A. L., Pross, J. and Friedrich, O. (2021). Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation. Paleoceanogr. Paleoclimatology, 36 (9). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2572-4525

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bahr, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kaboth-Bahr, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jaeschke, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chiessi, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cruz, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carvalho, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schefuss, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Geppert, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Albuquerque, A. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pross, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Friedrich, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-596609
DOI:	10.1029/2021PA004223
Journal or Publication Title:	Paleoceanogr. Paleoclimatology
Volume:	36
Number:	9
Date:	2021
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2572-4525
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DELTA-D VALUES; CLIMATE VARIATION; MONSOON RAINFALL; CONVERGENCE ZONE; LAST MILLENNIUM; BRAZIL; WATER; IMPACTS; OCEAN; SPELEOTHEM Multiple languages Geosciences, Multidisciplinary; Oceanography; Paleontology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59660