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

被引：18

作者：

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
]}

机构：

[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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 14期

基金：

巴西圣保罗研究基金会;

关键词：

HIGH-RESOLUTION; ASIAN MONSOON; ATMOSPHERIC CIRCULATION; PLANKTONIC-FORAMINIFERA; TEMPERATURE-GRADIENTS; MILLENNIAL-SCALE; LATE PLEISTOCENE; DONGGE CAVE; CLIMATE; ATLANTIC;

D O I：

10.1029/2020GL087948

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页数：10

共 71 条

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