Journal ArticleDOI
Orbitally driven east-west antiphasing of South American precipitation
Francisco W. Cruz,Mathias Vuille,Stephen J. Burns,Xianfeng Wang,Hai Cheng,Martin Werner,R. Lawrence Edwards,Ivo Karmann,Augusto S. Auler,Hanh Nguyen +9 more
TLDR
In this paper, a comparison between a speleothem record of precipitation in northeast Brazil and rainfall reconstructions from the rest of tropical South America shows that a similar antiphasing operated in the same hemisphere during the Holocene.Abstract:
The variations of tropical precipitation are antiphased between the hemispheres on orbital timescales. A comparison between a speleothem record of precipitation in northeast Brazil and rainfall reconstructions from the rest of tropical South America shows that a similar antiphasing operated in the same hemisphere during the Holocene. The variations of tropical precipitation are antiphased between the hemispheres on orbital timescales. This antiphasing arises through the alternating strength of incoming solar radiation in the two hemispheres, which affects monsoon intensity and hence the position of the meridional atmospheric circulation of the Hadley cells1,2,3,4. Here we compare an oxygen isotopic record recovered from a speleothem from northeast Brazil for the past 26,000 years with existing reconstructions of precipitation in tropical South America5,6,7,8. During the Holocene, we identify a similar, but zonally oriented, antiphasing of precipitation within the same hemisphere: northeast Brazil experiences humid conditions during low summer insolation and aridity when summer insolation is high, whereas the rest of southern tropical South America shows opposite characteristics. Simulations with a general circulation model that incorporates isotopic variations support this pattern as well as the link to insolation-driven monsoon activity. Our results suggest that convective heating over tropical South America and associated adjustments in large-scale subsidence over northeast Brazil lead to a remote forcing of the South American monsoon, which determines most of the precipitation changes in the region on orbital timescales.read more
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Book ChapterDOI
Information from paleoclimate archives
Valérie Masson-Delmotte,Michael Schulz,Ayako Abe-Ouchi,Juerg Beer,Andrey Ganopolski,J F Gonzáles Rouco,Eystein Jansen,Kurt Lambeck,Jürg Luterbacher,Tim R Naish,Timothy J. Osborn,Bette L. Otto-Bliesner,T Quinn,Rengaswamy Ramesh,Maisa Rojas,X Shao,Axel Timmermann +16 more
Journal ArticleDOI
Climate change patterns in Amazonia and biodiversity
Hai Cheng,Hai Cheng,Ashish Sinha,Francisco W. Cruz,Xianfeng Wang,Xianfeng Wang,R. Lawrence Edwards,Fernando M. d’Horta,Camila C. Ribas,Mathias Vuille,Lowell D. Stott,Augusto S. Auler +11 more
TL;DR: These absolute-dated speleothem oxygen isotope records that characterize hydroclimate variation in western and eastern Amazonia over the past 250 and 20 ka are presented, suggesting that higher biodiversity in western Amazonia, contrary to 'Refugia Hypothesis', is maintained under relatively stable climatic conditions.
Journal ArticleDOI
Global climate evolution during the last deglaciation
Peter U. Clark,Jeremy D. Shakun,Paul A. Baker,Patrick J. Bartlein,Simon Brewer,Edward J. Brook,Anders E. Carlson,Hai Cheng,Darrell S. Kaufman,Zhengyu Liu,Zhengyu Liu,Thomas M Marchitto,Alan C. Mix,Carrie Morrill,Bette L. Otto-Bliesner,Katharina Pahnke,James M. Russell,Cathy Whitlock,Jess F. Adkins,Jessica L. Blois,Jorie Clark,Steven M. Colman,William B Curry,Ben P. Flower,Feng He,Thomas C. Johnson,Jean Lynch-Stieglitz,Vera Markgraf,Jerry F. McManus,Jerry X. Mitrovica,Patricio I. Moreno,John W. Williams +31 more
TL;DR: A major effort by the paleoclimate research community to characterize changes through the development of well-dated, high-resolution records of the deep and intermediate ocean as well as surface climate indicates that the superposition of two modes explains much of the variability in regional and global climate during the last deglaciation.
Journal ArticleDOI
Water-stable isotopes in the LMDZ4 general circulation model: Model evaluation for present-day and past climates and applications to climatic interpretations of tropical isotopic records
TL;DR: In this article, the LMDZ-iso general circulation model was used to simulate water-stable isotopes from a midlatitude station and evaluated at different time scales (synoptic to interannual).
Journal ArticleDOI
The Global Paleomonsoon as seen through speleothem records from Asia and the Americas
TL;DR: In this article, a comprehensive synthesis of globally-distributed speleothem δ18O records from the Asian and South American monsoon regions is presented, highlighting three aspects of the GPM that are comparable to the modern GM: (1) the intensity swings on different timescales; (2) their global extent; and (3) an anti-phased inter-hemispheric relationship between the ASP and SPM on a wide range of timecales.
References
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Journal ArticleDOI
Southward Migration of the Intertropical Convergence Zone Through the Holocene
TL;DR: The Cariaco Basin record exhibits strong correlations with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global teleconnections among regional climates.
Journal ArticleDOI
Rapid changes in the hydrologic cycle of the tropical Atlantic during the last glacial.
TL;DR: Sedimentary time series of color reflectance and major element chemistry from the anoxic Cariaco Basin off the coast of northern Venezuela record large and abrupt shifts in the hydrologic cycle of the tropical Atlantic during the past 90,000 years, which supports the notion that tropical feedbacks played an important role in modulating global climate during the last glacial period.
Journal ArticleDOI
Late glacial stage and holocene tropical ice core records from huascaran, peru.
Lonnie G. Thompson,Ellen Mosley-Thompson,Mary E. Davis,P.-N. Lin,Keith Henderson,Jihong Cole-Dai,J. F. Bolzan,Kam-biu Liu +7 more
TL;DR: Two ice cores from the col of Huascar�n in the north-central Andes of Peru contain a paleoclimatic history extending well into the Wisconsinan (W�rm) Glacial Stage and include evidence of the Younger Dryas cool phase, implying that a strong warming has dominated the last two centuries.
Journal ArticleDOI
Variations of Sea Surface Temperature, Wind Stress, and Rainfall over the Tropical Atlantic and South America.
Paulo Nobre,Jagadish Shukla +1 more
TL;DR: In this article, the development of sea surface temperature (SST) anomaly patterns over the tropical Atlantic was investigated and the evolution of large-scale rainfall anomaly pattern over the equatorial Atlantic and South America were also investigated.
Journal ArticleDOI
Wet periods in northeastern Brazil over the past 210 kyr linked to distant climate anomalies
Xianfeng Wang,Augusto S. Auler,Lawrence Edwards,Hai Cheng,Patrícia S. Cristalli,Patrícia S. Cristalli,Peter L. Smart,David Richards,Chuan-Chou Shen +8 more
TL;DR: A 210,000-year record of wet periods in tropical northeastern Brazil is presented, finding wet periods that are synchronous with periods of weak East Asian summer monsoons, cold periods in Greenland, Heinrich events in the North Atlantic and periods of decreased river runoff to the Cariaco basin.