Paleoceanography and global change in the S Atlantic and Antarctic for the last 150 kys

A study of sediment cores recovered in the Subantarctic and Antarctic sectors of the Atlantic Ocean was carried out in order to develop to main aspects for the late Pleistocene and Holocene: 1) a high-resolution stratigraphy pattern; 2) paleoceanographic evolution. A high resolution stratigraphy pattern was developed combining bio-events (Calcareous nannofossils, diatoms, radiolarians and planktonic foraminifers) with other techniques such as biogeochemistry (stable isotopes), paleomagnetism and sedimentology. Special attention was paid to the biostratigraphy (ecostratigraphy); depending of the region (related with the ecological characteristics) individual groups or a combination of microfossils were used. At the same time, the quantitative analyses of the above mentioned groups plus the additional biogeochemical techniques permitted the reconstruction of different surface water masses, and its evolution along the last climatic cycles or in selected time-slices like in the deglaciation intervals.