Journal ArticleDOI
Comparison between radiocarbon ages obtained on coexisting planktonic foraminifera
Wallace S. Broecker,Michael Andree,Georges Bonani,Willy Wolfli,Mieczyslawa Klas,Alan C. Mix,Hans Oeschger +6 more
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In this article, the authors discuss the possible causes for these differences and attempt to evaluate their impact on the interpretation of benthic-planktonic age differences and evaluate the impact of these differences on the ventilation rate of planktonic foraminifera.Abstract:
As a test of the reliability of paleocean ventilation rates reconstructed from radiocarbon age differences between planktonic and benthic foraminifera, measurements have been made on coexisting species of planktonic foraminifera While ideally no differences should exist, we do find them In this paper we discuss the possible causes for these differences and attempt to evaluate their impact on the interpretation of benthic-planktonic age differencesread more
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East Asian monsoon climate during the Late Pleistocene: high-resolution sediment records from the south China Sea
Luejiang Wang,Michael Sarnthein,Helmut Erlenkeuser,Joan O. Grimalt,Pieter Meiert Grootes,S Heilig,Elena Ivanova,Markus Kienast,Carles Pelejero,Uwe Pflaumann +9 more
TL;DR: In this paper, the authors used 10 sediment cores and 40 core-top samples from the South China Sea (SCS) to obtain proxy records of past changes in East Asian monsoon climate on millennial to bidecadal time scales over the last 220,000 years.
Journal ArticleDOI
Correction of accelerator mass spectrometry 14C ages measured in planktonic foraminifera: paleoceanographic implications
TL;DR: In this article, the Δ(14C atmosphere, 14C sea surface) tracer was used as a new paleoceanographic tracer which may provide additional information about high latitude surface waters complementary to those obtained with 13C/12C and Cd/Ca ratios measured in planktonic foraminifera.
Journal ArticleDOI
Review and new aspects concerning the formation of eastern Mediterranean sapropels
TL;DR: In this article, the formation of sapropels in an anti-estuarine type of circulation was proposed, which was to some degree weakened relative to the present in response to reduction of the eastern Mediterranean excess of evaporation over freshwater input.
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.
References
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Journal ArticleDOI
Vertical distribution and isotopic fractionation of living planktonic foraminifera from the Panama Basin
TL;DR: In this paper, the vertical and seasonal distribution of planktonic foraminifera in the western North Atlantic has been investigated using data from the Panama Basin, where the authors used a multiple opening-closing net and environmental sensing system to collect 13 sets of eight vertically stratified oblique samples.
Journal ArticleDOI
The chronology of the last deglaciation: implications to the cause of the Younger Dryas event
Wallace S. Broecker,Michael Andree,Willy Wolfli,Hans Oeschger,Georges Bonani,James P. Kennett,Dorothy M. Peteet +6 more
TL;DR: In this paper, Accelerator Mass Spectrometry (AMS) radiocarbon results on two strategically located deep-sea cores were used to provide a chronology for surface water temperatures in the northern Atlantic and the other for the meltwater discharge from the Mississippi River.
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Rates of benthic mixing in deep-sea sediment as determined by radioactive tracers
TL;DR: A series of closely spaced radiocarbon measurements on a carbonate-rich box core from the western equatorial Pacific showed a mixed layer at least 7 cm thick, with 14C ages between 4000 and 5000 years, and an orderly progression of ages below this layer, indicating an average sedimentation rate of about 2 cm/103 yr as discussed by the authors.
Journal ArticleDOI
Reconstruction of the last deglaciation: deconvolved records of δ18O profiles, micropaleontological variations and accelerator mass spectrometric14C dating
TL;DR: In this article, a low-pass filter is used to reduce the amplitudes of stratigraphic signals, which can lead to a loss of high-frequency events in the stratigraphraphic record.
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Radiocarbon measurements on coexisting benthic and planktic foraminifera shells: potential for reconstructing ocean ventilation times over the past 20 000 years
TL;DR: In this article, the AMS 14C dating of shells handpicked from deep sea sediments is explored, and it is shown that while the age difference between planktonic and benthic shells must carry information regarding paleocirculation rates, this message is likely obscured by effects associated with the coupling between bioturbation and dissolution and between biotic abundance change.