Late Pleistocene variability in Timor Sea hydrology : evidence from paleotemperature proxies

Since the early days of paleoceanographic investigations, variations in temperature, salinity and other environmental parameters have been reconstructed based on the elemental and isotopic composition of both planktonic and benthic foraminiferal tests deposited in marine sediments. However, substantial uncertainties still exist concerning the relationships between geochemical proxies and ambient variability. In the first phase of this study, I investigated the reliability of geochemical proxies (Mg/Ca and 18O) for bottom water temperature (BWT) and sea surface temperature (SST) reconstructions in a suite of core top samples from the Timor Sea and Makassar Strait. In the second phase of this study, I used a multi-proxy record of planktonic and benthic foraminiferal 18O, Mg/Ca-derived surface and lower thermocline temperatures, X-ray fluorescence (XRF)-derived runoff and sediment winnowing from sediment core SO18471 to reconstruct hydrological variability in the Timor Strait for the past 130 ka.



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