Dinoflagellate cysts of sediment core PO287-26-1B from the Tagus River

The Iberian Margin, located in the mid-latitude North Atlantic at the western edge of Europe, is a key region for reconstructing past climate and oceanographic variability. As part of the PTDC/CTA-CLI/2884/2021 ICW3P project, this study presents a dinoflagellate cyst record from an inner-shelf sediment core collected west of the Tagus River mouth (core POS-26B). The western Portuguese margin represents the northern limit of the Canary Current upwelling system, which is characterized by seasonal, wind-driven upwelling from May to September.