9:25 AM - 9:40 AM
[MIS14-02] Accurate chronology and climatic reconstruction around MIS 11 (interglacial period ~400,000 years ago) from Dome Fuji ice core, Antarctica
Keywords:Ice core, MIS 11, interglacial period, Dome Fuji
Marine sediment cores from northern North Atlantic region exhibit millennial-scale variations, including abrupt climatic shifts and bipolar seesaw, during glacial periods and terminations in various proxy records (e.g. sea surface temperature and ice-rafted debris). By correlating the millennial-scale changes recorded in the marine sediment cores with those in the Dome Fuji ice core (CH4 concentration and d18O of ice), it may be possible to transfer the Dome Fuji chronology to the marine cores from the North Atlantic. We first attempted to correlate planktonic δ18O and IRD records from the marine core ODP 980 with the Dome Fuji CH4 around MIS 11 and constrain the durations of interglacial periods recorded in the marine core, with some success. However, the current resolution of the Dome Fuji gas records (~2000 years on average) is not sufficient to undoubtedly identify all millennial-scale events, thus we will start new measurements to improve the resolution. In the presentation, we will show the results of the new measurements and synchronization, and discuss the timing, duration and mechanism of climatic changes over Termination V and MIS 11.