Tropical South Pacific sea surface temperatures during the last deglaciaton from Tahiti corals

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Author(s): Felis, T.; Asami, R.; Deschamps, P.; Hathorne, E. C.; Koelling, M.; Durand, N.; Cabioch, G.; Bard, E. G.
Author Affiliation(s): Primary:
University of Bremen, Marum-Center for Marine Environmental Sciences, Bremen, Germany
Transdisciplinary Research Organization for Subtropics and Island Studies, Japan
Centre de Recherche et d'Enseignement de Géosciences de l'Environnement, France
GEOMAR-Helmholtz Centre for Ocean Research Kiel, Germany
Institut de Recherche pour le Développement, France
Volume Title: AGU 2011 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2011; American Geophysical Union 2011 fall meeting, San Francisco, CA, Dec. 5-9, 2011. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Coral Sr/Ca-based reconstructions have revealed a larger amplitude of sea surface temperature (SST) changes throughout the last deglaciation relative to foraminiferal Mg/Ca and alkenone-based SST reconstructions in the tropical Atlantic and the tropical southwestern Pacific. Here we present new coral Sr/Ca records from Tahiti in the central tropical South Pacific derived from fossil Porites sp. colonies drilled during IODP Expedition 310 (Tahiti Sea Level). These coral provide subseasonally resolved snapshots of tropical Pacific climate during the last deglaciation, accurately dated by U-series. We use (1) several living Porites colonies as a robust modern benchmark to take into account between-colony offsets in mean Sr/Ca of modern Tahiti Porites corals, (2) a thorough diagenetic screening procedure, and (3) a common aragonite standard to correct for inter-laboratory offsets in mean Sr/Ca. Based on this approach we conclude that early Holocene SST was not significantly lower than today and that early last deglacial SST was not lower by several degrees relative to modern SST in this region of the tropical Pacific, as reported in earlier coral Sr/Ca-based reconstructions from the tropical oceans. However, our results indicate a significant cooling during the Younger Dryas consistent with earlier results from Vanuatu in the western tropical South Pacific. Our new coral Sr/Ca-based SST estimates from Tahiti in the central tropical South Pacific provide a supplement to foraminiferal Mg/Ca and alkenone-based reconstructions of tropical Pacific SST, which are available from the far western and eastern part of the basin only.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Anthozoa; Cenozoic; Cnidaria; Deglaciation; East Pacific; Expedition 310; Foraminifera; French Polynesia; Integrated Ocean Drilling Program; Microfossils; Oceania; Pacific Ocean; Pleistocene; Polynesia; Quaternary; Reconstruction; Sea water; Sea-level changes; Sea-surface temperature; Society Islands; South Pacific; Southeast Pacific; Tahiti; Tahiti Sea Level Expedition; Tropical environment; Upper Pleistocene; Upper Weichselian; Weichselian; Younger Dryas
Coordinates: S174600 S172900 W1492400 W1493600
Record ID: 2018032695
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