DLS - Aradhna E. Tripati (UCLA)

Aradhna E. Tripati (UCLA)
Wednesday, April 28, 2021 - 12:00pm to 1:00pm

Carbonate clumped isotope geochemistry as an applied tool in paleoceanography and paleoclimate, within an inclusive science framework

The emergence of new proxies enables us to resolve fundamental questions about Earth’s evolution. A promising tool for the study of environmental change through time is the carbonate clumped isotope thermometer. In principle, this technique can provide a thermodynamically based estimate of carbonate mineral formation temperature and a relatively assumption-free calculation of water 18O/16O ratios. Over the past fourteen years, I have studied the systematics of carbonate clumped isotopes in foraminifera and coccoliths and other geological archives including lacustrine and soil carbonates. In this talk, I will discuss contributions I have made to analytical advances to develop its usability for paleoceanographic and paleoclimatic reconstructions, highlight applications to reconstruct ocean temperatures and terrestrial hydroclimates in the past, including proxy-model comparisons to understand underlying dynamical mechanisms, and new developments relating to the physical geochemistry of clumped isotopes in carbonates where we have used both theory and experiments to quantify kinetic isotope effects, and have developed the novel capability to make measurements of multiple clumped isotope species in carbonates. I will describe the social context for this scientific research, and how this has led to efforts within my research group, in the Center for Diverse Leadership in Science, and with partners, to support belonging, equity, justice and innovation in the geosciences and within higher education.

About this Series:

The Department Lecture Series at EAPS at MIT is a series of Weekly talks given by leading thinkers in the areas of geology, geophysics, geobiology, geochemistry, atmospheric science, oceanography, climatology, and planetary science. For more information please contact: Maggie Cedarstrom, maggie84@mit.edu.