I am interested in understanding the interactions between marine systems and climate change in the geologic past. Oxygenation changes in the ocean is one of the most important parameters to affect global climate and life evolution on the Earth. My PhD research work focuses on using I/Ca ratios in carbonate rocks and foraminifera as a redox proxy to reconstruct oxygenation changes in the paleo-oceans. My research project studies not only the older sedimentary rocks (e.g. Neoproterozoic, ~800 million years ago), but also the beautifully-looking younger foraminifera (e.g. glacial-interglacial cycles, ~120 thousand years ago). My research combines the trace-element geochemistry laboratory work and Earth System Model reconstruction.