Vigorous exchange between the Indian and Atlantic oceans at the end of the past five glacial periods
Frank Peeters,Ruth Acheson,Geert-Jan A Brummer,Wilhelmus P. M. de Ruijter,Ralph R Schneider,Gerald Ganssen,Els Ufkes,Dick Kroon +7 more
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TLDR
The reconstruction indicates that Indian–Atlantic water exchange was highly variable: enhanced during present and past interglacials and largely reduced during glacial intervals, suggesting a crucial role for Agulhas leakage in glacial terminations, timing of interhemispheric climate change and the resulting resumption of the Atlantic meridional overturning circulation.Abstract:
The magnitude of heat and salt transfer between the Indian and Atlantic oceans through 'Agulhas leakage' is considered important for balancing the global thermohaline circulation. Increases or reductions of this leakage lead to strengthening or weakening of the Atlantic meridional overturning and associated variation of North Atlantic Deep Water formation. Here we show that modern Agulhas waters, which migrate into the south Atlantic Ocean in the form of an Agulhas ring, contain a characteristic assemblage of planktic foraminifera. We use this assemblage as a modern analogue to investigate the Agulhas leakage history over the past 550,000 years from a sediment record in the Cape basin. Our reconstruction indicates that Indian-Atlantic water exchange was highly variable: enhanced during present and past interglacials and largely reduced during glacial intervals. Coherent variability of Agulhas leakage with northern summer insolation suggests a teleconnection to the monsoon system. The onset of increased Agulhas leakage during late glacial conditions took place when glacial ice volume was maximal, suggesting a crucial role for Agulhas leakage in glacial terminations, timing of interhemispheric climate change and the resulting resumption of the Atlantic meridional overturning circulation.read more
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Journal ArticleDOI
The last glacial termination.
George H. Denton,Robert F. Anderson,Robert F. Anderson,J. R. Toggweiler,Richard Lawrence Edwards,Joerg M. Schaefer,Joerg M. Schaefer,Aaron E. Putnam +7 more
TL;DR: A comprehensive hypothesis of how Earth emerged from the last global ice age is offered, whose prerequisite was the growth of very large Northern Hemisphere ice sheets, whose subsequent collapse created stadial conditions that disrupted global patterns of ocean and atmospheric circulation.
Journal ArticleDOI
Atlantic reef fish biogeography and evolution
Sergio R. Floeter,Sergio R. Floeter,Luiz A. Rocha,D. R. Robertson,Jean-Christophe Joyeux,W. F. Smith-Vaniz,Peter Wirtz,Alasdair J. Edwards,João P. Barreiros,Carlos E. L. Ferreira,João Luiz Gasparini,Alberto Brito,J.M. Falcón,Brian W. Bowen,Giacomo Bernardi +14 more
TL;DR: Both historical events and relatively recent dispersal have had a strong influence on Atlantic tropical marine biodiversity and have contributed to the biogeographical patterns observed today; however, examples of the latter process outnumber those of the former.
Journal ArticleDOI
On the role of the Agulhas system in ocean circulation and climate
Lisa M. Beal,Wilhelmus P. M. de Ruijter,Arne Biastoch,Rainer Zahn,Meghan F. Cronin,Juliet Hermes,Johann R. E. Lutjeharms,Graham D. Quartly,Tomoki Tozuka,Sheekela Baker-Yeboah,Thomas G. Bornman,Paolo Cipollini,Henk A. Dijkstra,Ian Hall,Wonsun Park,Frank Peeters,Pierrick Penven,Herman Ridderinkhof,Jens Zinke +18 more
TL;DR: Detailed modelling experiments—backed by palaeoceanographic and sustained modern observations—are required to establish firmly the role of the Agulhas system in a warming climate.
Journal ArticleDOI
Interhemispheric Atlantic seesaw response during the last deglaciation.
Stephen Barker,Paula Diz,Maryline J Vautravers,Jennifer Pike,Gregor Knorr,Ian Hall,Wallace S. Broecker +6 more
TL;DR: New records from the South Atlantic are presented that show rapid changes during the last deglaciation that were instantaneous (within dating uncertainty) and of opposite sign to those observed in the North Atlantic.
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.
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