The Changes Of Indonesian Thoughflow And The Response Of Orbital Cycles During The Last 230 Ka Indicated From Core MD01-2376

The changes of Indonesian thoughflow and the response of orbital cycles during the last 230 ka indicated from core MD01‐2376The global thermohaline circulation ("Great Conveyor Belt") plays a fundamental role in the long term regulation of climate because of its effects on heat and salt transport to high latitudes and its implication in the hydrologic cycle.One of the major objectives of our work is to study past changes in one of the major "Conveyor Belt" return flow, the Indonesian Throughflow (ITF), where warm surface waters from the western Pacific Ocean are transferred to the equatorial Indian Ocean. It is also important to have a better understanding of monsoon dynamics, especially in relationships with Pacific Warm Pool evolution. The sedimentary records retrieved in high sedimentation rate areas will allow us to study past changes in the Indonesian monsoon activity at different time scale in relationships with orbitally‐driven changes in past insolation and/or the evolution of the western Pacific Warm Pool.The core MD01‐2376 (28 m length) retrieved during MD122‐IMAGES VII (International Marine Global Changes Study) at 2906 m of water depth, in the Timor Sea (12 318 S‐ 121 192 E), an area which is situated in the southwestern of the Indo‐Pacific Warm Pool, was chosen for this purpose. The age model of the core was developed by correlating itsδ18O andδ14C records, and we reconstructed the past sea surface temperature by the ratio of Mg and Ca. The concentration of CaCO3 and total organic carbon (TOC) show changes in phase with the past sea level variation and productivity changes. The high‐resolution (1 cm interval) elements (from Al to Ba) compositions were measured on XRF core scanner AVAATECH.The results show clear glacial‐interglacial changes, especially in the CaCO3 and TOC records. Ours results indicate that the productivity and input of terrestrial were increased during periods of low sea level. The bottom water circulation was reduced or lower oxygen than interglacial, which might preserved more organic matters.