Here is a sampling of projects that we’re working on:
Mapping past precipitation changes using closed-basin lakes
Shoreline deposits and sediments in closed-basin lakes preserve high-fidelity records of the timing and magnitude of past lake level changes. We precisely U-Th date carbonates from these lakes, then combine these ages with measurements of isotopic proxies reflecting temperature and water balance to map precipitation through space and time. Our ongoing work is focused in the U.S. Great Basin and the Altiplano of northern Chile, led by Christine Chen and former student Elena Steponaitis.
An example: D. McGee, J. Quade, R.L. Edwards, W.S. Broecker, H. Cheng, P.W. Reiners, N. Evenson, 2012. Lacustrine cave carbonates: Precisely dated recorders of paleohydrologic change in Lake Bonneville. Earth and Planetary Science Letters 351-352, 182-194.