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Data report: late Pliocene planktonic foraminifer assemblages from IODP Holes U1443B, U1443C, and U1445A

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      Abstract

      Planktonic foraminifers are key to reconstructing the paleoceanography and monsoon history of the Bay of Bengal. We examined foraminifers from International Ocean Discovery Program Site U1443 on the Ninetyeast Ridge and Site U1445 in the northwest Bay of Bengal, documented the planktonic assemblages, and compared four measures of sample preservation. These samples contain typical late Pliocene assemblages, although the upper stratigraphic limits of Sphaeroidinellopsis seminulina and Dentoglobigerina altispira are more similar to those of the Atlantic Ocean than of the Pacific Ocean. Observations of sample fragmentation and test preservation are more useful than numerical calculations based on foraminifer abundances in describing sample dissolution and offer a consistent means to compare samples from different sites in the Bay of Bengal.

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      Global Multi-Resolution Topography synthesis

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        Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale

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          Tropical ocean temperatures over the past 3.5 million years.

          Determining the timing and amplitude of tropical sea surface temperature (SST) change is an important part of solving the puzzle of the Plio-Pleistocene ice ages. Alkenone-based tropical SST records from the major ocean basins show coherent glacial-interglacial temperature changes of 1 degrees to 3 degrees C that align with (but slightly lead) global changes in ice volume and deep ocean temperature over the past 3.5 million years. Tropical temperatures became tightly coupled with benthic delta18O and orbital forcing after 2.7 million years. We interpret the similarity of tropical SST changes, in dynamically dissimilar regions, to reflect "top-down" forcing through the atmosphere. The inception of a strong carbon dioxide-greenhouse gas feedback and amplification of orbital forcing at approximately 2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time.
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            Author and article information

            Journal
            10.14379/iodp.proc.353.2016
            Proceedings of the International Ocean Discovery Program
            International Ocean Discovery Program
            2377-3189
            8 November 2018
            10.14379/iodp.proc.353.201.2018

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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            Self URI (journal page): http://publications.iodp.org/

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