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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial-Interglacial Cycles

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Author(s):
Hou, Alicia [1] ; Bahr, Andre [1] ; Raddatz, Jacek [2] ; Voigt, Silke [2] ; Greule, Markus [1] ; Albuquerque, Ana Luiza [3] ; Chiessi, Cristiano M. [4] ; Friedrich, Oliver [1]
Total Authors: 8
Affiliation:
[1] Heidelberg Univ, Inst Earth Sci, Heidelberg - Germany
[2] Goethe Univ Frankfurt, Inst Geosci, Frankfurt - Germany
[3] Univ Fed Fluminense, Programa Geociencias Geoquim, Niteroi, RJ - Brazil
[4] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Geophysical Research Letters; v. 47, n. 14 JUL 28 2020.
Web of Science Citations: 0
Abstract

Precipitation extremes with devastating socioeconomic consequences within the South American Monsoon System (SAMS) are expected to become more frequent in the near future. The complexity in SAMS behavior, however, poses severe challenges for reliable future projections. Thus, robust paleomonsoon records are needed to constrain the high spatiotemporal variability in the response of SAMS rainfall to different climatic drivers. This study uses Ti/Ca ratios from X-ray fluorescence scanning of a sediment core retrieved off eastern Brazilian to trace precipitation changes over the past 322 Kyr. The results indicate that despite the spatiotemporal complexity of the SAMS, insolation forcing is the primary pacemaker of variations in the monsoonal system. Additional modulation by atmosphericpCO(2)suggests that SAMS intensity over eastern Brazil will be suppressed by rising CO(2)emissions in the future. Lastly, our record reveals an unprecedented strong and persistent wet period during Marine Isotope Stage 6 driven by anomalously strong trade winds. (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