Reconstructing the Indonesian Throughflow variability and its climatology using long corals from the North-western coast of Australia

• DOI: 10.5194/egusphere-egu24-15391
• Publication Date: 2024-03-09T02:09:04Z
• Authors: Padmasini Behera; Jens Zinke; Arnoud Boom; Paul A Wilson; Bastian Hambach
• Keywords: Throughflow

The Indonesian Throughflow (ITF) is the primary tropical current, which transfers heat and salinity to tropics extratropics region. Crucial global ocean circulation system, ITF a major component of climate pattern. Re-analysis instrumented data together with results coupled ocean-atmosphere model experiments, provide an understanding linkages between variability inter-annual modes such as El Niño Southern Oscillation (ENSO) Indian Ocean Dipole (IOD). However, lack longer climatic records makes it challenging isolate anthropogenic signal from natural variability. Here we present preliminary new, absolutely dated, seasonally resolved proxy sea surface temperature Timor Sea, northwest coast Australia using cores taken long-lived corals (~240 years) on Hibernia-Ashmore reef. Sea proximal location for outlet into eastern Ocean, where anomalies are greatest control unequivocal. Herein report oxygen isotopic composition seawater reconstructed paired analyses skeletal Sr/Ca isotope last 40 yr. resulting bimonthly coral record aids in linkage ENSO, IOD strength. Comparison long marine terrestrial around region world further reveals relationship Austral-Asian-African monsoon rainfall changes.