CP Climate of the Past CP Clim. Past 1814-9332 Copernicus Publications Göttingen, Germany 10.5194/cp-7-75-2011 Sea-surface salinity variations in the northern Caribbean Sea across the Mid-Pleistocene Transition Sepulcre S. 1 Vidal L. 1 Tachikawa K. 1 Rostek F. 1 Bard E. 1 CEREGE, Université Aix-Marseille, CNRS, Collège de France, IRD, Europôle de l'Arbois, BP80, 13545 Aix-en-Provence, France 11 02 2011 7 1 75 90 Copyright: © 2011 S. Sepulcre et al. 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://cp.copernicus.org/articles/7/75/2011/cp-7-75-2011.html The full text article is available as a PDF file from https://cp.copernicus.org/articles/7/75/2011/cp-7-75-2011.pdf

By reconstructing past hydrologic variations in the Northern Caribbean Sea and their influence on the stability of the Atlantic Meridional Overturning Circulation (AMOC) during the last 940 ka, we seek to document climate changes in this tropical area in response to the Mid-Pleistocene Transition (MPT). Using core MD03-2628, we estimated past changes in sea surface salinity (SSS) using &Delta;&delta;<sup>18</sup>O, the difference between the modern, and the past &delta;<sup>18</sup>O of seawater (obtained by combining alkenone thermometer data with the &delta;<sup>18</sup>O of the planktonic foraminifera <i>Globigerinoides rube</i> (white) and corrected for ice-sheet volume effects). Today, the lowest SSS values in the area studied are associated with the northernmost location of the Inter-Tropical Convergence Zone (ITCZ). The &Delta;&delta;<sup>18</sup>O record obtained from core MD03-2628 exhibits glacial/interglacial cyclicity with higher values during all glacial periods spanning the last 940 ka, indicating increased SSS. A long-term trend was also observed in the &Delta;&delta;<sup>18</sup>O values that exhibited a shift toward lower values for interglacial periods during the last 450 ka, as compared to interglacial stages older than 650 ka. A rise in SSS during glacial stages may be related to the southernmost location of the ITCZ, which is induced by a steeper cross-equator temperature gradient and associated with reduced northward cross-equatorial oceanic transport. Therefore, the results suggest a permanent link between the tropical salinity budget and the AMOC during the last 940 ka. Following the MPT, lower salinities during the last five interglacial stages indicated a northernmost ITCZ location that was forced by changes in the cross-equator temperature gradient and that was associated with the poleward position of Southern Oceanic Fronts that amplify the transport of heat and moisture to the North Atlantic. These processes may have contributed to the amplification of the climate cycles that followed the MPT.

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