Glacial Climate Aradhna Tripati, Assistant Professor University of California, Los Angeles Departments of Earth and Space Sciences & Atmospheric and Oceanic Sciences, Institute of Geophysics and Planetary Physics My research group uses the sedimentary record to address fundamental questions about the dynamics of climate change, both past and future. We work on the development and application of novel geochemical tools to document and understand the evolution of temperature, ice volume, and pH. The principal aim of our research is to understand the role of the carbon cycle in changing seawater chemistry and climate. Our research is focused on applying innovative experimental approaches in order to use the geologic record as a rich laboratory for the study of climate processes. The primary tools we use include the new ‘clumped isotope’ thermometer, and the elemental composition of carbonates. We also integrate geochemical measurements with field-based observations, sedimentologic and micropaleontologic data, and models. Research topics we are currently pursuing include studying: (1) changes in tropical and subtropical climate from the Last Glacial Maximum to the present, (2) calcification and diagenetic processes that govern isotopic and elemental distributions in carbonate minerals, (3) polar climate stability during past warm intervals in Earth’s history, (4) the evolution of atmospheric carbon dioxide levels and its consequences on oceanic pH, and (5) the history of the major cationic composition of seawater.