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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Geophysical Research Letters; v. 47, n. 14 JUL 28 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/15123-4 - Perspectivas pretéritas sobre limiares críticos do sistema climático: a Floresta Amazônica e a célula de revolvimento meridional do Atlântico (PPTEAM)
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores - Fase 2