Planktic foraminiferal Mg/Ca ratios of sediment cores in the tropical Atlantic ...

• Main Authors: Reissig, Stefan, Nürnberg, Dirk, Bahr, André, Poggemann, David-Willem, Hoffmann, Julia
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2019
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.897085; https://doi.pangaea.de/10.1594/PANGAEA.897085

During times of deglacial Atlantic Meridional Overturning Circulation (AMOC) perturbations, the tropical Atlantic experienced considerable warming at subsurface levels. Coupled ocean-atmosphere simulations corroborate the tight teleconnection between the tropical Atlantic and climate change at high northern latitudes, but still underestimate the relevance of the subsurface N Atlantic Subtropical Gyre (STG) for heat and salt storage and its sensitivity to rapid climatic change.Here we reconstruct vertical and lateral temperature and salinity gradients in the tropical W Atlantic and the Caribbean over the last 30 kyrs, based on planktic deep and shallow dwelling foraminiferal Mg/Ca and δ18O-records. The rapid and large amplitude subsurface changes illustrate a dynamic STG associated with abrupt shifts of North Atlantic hydrographic and atmospheric regimes. We infer that during full glacial conditions, the STG has been shifted southward while intensified Ekman-downwelling associated to strengthened trade winds ... : Supplement to: Reissig, Stefan; Nürnberg, Dirk; Bahr, André; Poggemann, David-Willem; Hoffmann, Julia (2019): Southward Displacement of the North Atlantic Subtropical Gyre Circulation System During North Atlantic Cold Spells. Paleoceanography and Paleoclimatology, 34, 866-885 ...