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      Hydrological variability in Florida Straits during Marine Isotope Stage 5 cold events : MIS 5 AT FLORIDA STRAITS

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          Age dating and the orbital theory of the ice ages: Development of a high-resolution 0 to 300,000-year chronostratigraphy

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            Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes.

            The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies, but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the rate of overturning. Here we report measurements of 231Pa/230Th, a kinematic proxy for the meridional overturning circulation, in a sediment core from the subtropical North Atlantic Ocean. We find that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500 yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago. Following these cold events, the 231Pa/230Th record indicates that rapid accelerations of the meridional overturning circulation were concurrent with the two strongest regional warming events during deglaciation. These results confirm the significance of variations in the rate of the Atlantic meridional overturning circulation for abrupt climate changes.
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              Southward migration of the intertropical convergence zone through the Holocene.

              Titanium and iron concentration data from the anoxic Cariaco Basin, off the Venezuelan coast, can be used to infer variations in the hydrological cycle over northern South America during the past 14,000 years with subdecadal resolution. Following a dry Younger Dryas, a period of increased precipitation and riverine discharge occurred during the Holocene "thermal maximum." Since approximately 5400 years ago, a trend toward drier conditions is evident from the data, with high-amplitude fluctuations and precipitation minima during the time interval 3800 to 2800 years ago and during the "Little Ice Age." These regional changes in precipitation are best explained by shifts in the mean latitude of the Atlantic Intertropical Convergence Zone (ITCZ), potentially driven by Pacific-based climate variability. 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.
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                Author and article information

                Journal
                Paleoceanography
                Paleoceanography
                American Geophysical Union (AGU)
                08838305
                June 2011
                June 2011
                May 21 2011
                : 26
                : 2
                : n/a
                Affiliations
                [1 ]Leibniz Institute for Marine Sciences IFM-GEOMAR; Kiel Germany
                [2 ]Institute of Geosciences; Christian-Albrechts-Universität zu Kiel; Kiel Germany
                Article
                10.1029/2010PA002015
                8c2c8877-16c6-43d1-aacb-50856680d450
                © 2011

                http://doi.wiley.com/10.1002/tdm_license_1.1

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