Research

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My research addresses climate and global change in Earth's past, present and future. I use a broad range of approaches to reconstruct past climate and environmental changes from geologic archives from land and ocean. Examples include stable isotopes of oxygen and carbon in foraminifera from deep-sea sediments, ocean paleothermometry based on Mg/Ca and alkenones, geochemistry of speleothem deposits, and dendrochronology. I am especially interested in global climate variability during the Pleistocene and Holocene, and a central focus of my research is on the evolution of the El Niño-Southern Oscillation in the equatorial Pacific Ocean and its impacts around the world.