The southern Chilean continental margin off the Aysen Fjords region is situated within a zone of high precipitation (driven by the southern westerly wind belt), generated by the ocean–atmospheric control of the Southern Polar Front that moves seasonally between 50°S (summer) and 40°– 45°S (winter). It is also a zone of important volcanic activity in the Andes chain marked by thirteen Quaternary large volcanic centers, forming the southern volcanic zone (SVZ). Hence, this region constitutes a key zone to better understand the variability of the atmospheric and oceanic circulation systems in the southern hemisphere and to elucidate their roles in climate changes at regional and global scale. For this topic, we have selected a long CALYPSO high sedimentation piston core MD07-3088 collected off the south Chilean margin between the northern Chonos archipelago and southern Taitao peninsula at about 46°S during the IMAGES R/V Marion Dufresne cruise Pachiderme (February 2007). We present here preliminary results dealt on quantitative estimates of past sea surface reservoir 14C ages, necessary to establish a common chronological framework for marine, continental and cryospheric paleoproxies, and crucial to understand the ocean-atmosphere climatic system. AMS 14C dates of tephra, contemporaneously deposited over the Northern Patagonia marine and terrestrial regions reveal that sea-surface reservoir 14C ages range at 1320 and 975 years during the deglaciation and before the Antarctic Cold Reversal period respectively. By contrast, sea-surface reservoir 14C ages decrease at the onset and during the upper Holocene and were estimated at 920 and 790 years respectively.