Oxygen Isotope Records and Salinity Changes in the Northeastern Atlantic Ocean during the Last 18,000 Years

• Published in: Paleoceanography
• Main Authors: Duplessy, J.C., Bard, Edouard, Labeyrie, L., Duprat, J., Moyes, J.
• Other Authors: Centre des Faibles Radioactivités, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Collège de France - Chaire Evolution du climat et de l'océan, Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Département de Géologie et d'Océanographie Talence (DGO), Université Sciences et Technologies - Bordeaux 1 (UB)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1993
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Fairbanks; Planktonic foraminifera
• Online Access: https://hal.science/hal-03584481; https://hal.science/hal-03584481/document; https://hal.science/hal-03584481/file/Paleoceanography%20-%20June%201993%20-%20Duplessy%20-%20Oxygen%20Isotope%20Records%20and%20Salinity%20Changes%20in%20the%20Northeastern%20Atlantic%20Ocean.pdf; https://doi.org/10.1029/93PA00455

International audience A comparison of the deglaciation •5180 r•ord of northeastern Atlantic core SU 81-18 with that calculated by adding the •5180 changes due to sea surface temperature and ice volume variations shows that planktonic foraminifera have also recorded seawater •5180 changes due to salinity (local advection and evaporation-precipitation (E-P)) changes. Using a simple ocean box model of meltwater dilution during the deglaciation, we show that sea surface salinity covaried with temperature. Despite the injection of meltwater associated with the climate warming, sea surface salinity was high when sea surface water was warm and low during cold events. This implies that the combined effect of local E-P changes and northward advection of saline subtropical water were the main factor responsible for the surface water salinity variations in the northeastern Atlantic Ocean during the last 18,000 years. INTRODUCTION Pleistocene glacial-interglacial oscillations resulted in large variations of surface water temperature, continental ice volume, and sea level [Emiliani, 1955; CLIMAP Project Members, 1976; 1981; Fairbanks, 1989]. According to a theory developed by Milankovitch [ 1930], insolation changes due to variations of the position of the Earth on its orbit around the Sun trigger •Centre des Faibles Radioactivit[s, Laboratoire mixte Centre National d'Etudes Spatiales-Commissiariat •t l'Energie Atomique