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Article Dans Une Revue Paleoceanography Année : 1993

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

Résumé

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,
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hal-03584481 , version 1 (22-02-2022)

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J.C. Duplessy, Edouard Bard, L. Labeyrie, J. Duprat, J. Moyes. Oxygen Isotope Records and Salinity Changes in the Northeastern Atlantic Ocean during the Last 18,000 Years. Paleoceanography, 1993, 8 (3), pp.341-350. ⟨10.1029/93PA00455⟩. ⟨hal-03584481⟩
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