We research how uplift of the spectacular ranges in Asia--including the Himalayas, Tibetan Plateau, Tien Shan, and Altai--have modified climate in both Asia and around the world.

How precipitation and runoff will change in the desert Southwest as atmospheric CO2 rises remains a pressing question, with implications for the cities, farmers, and ecosystems that call this unique region home. We are studying a unparalleled sedimentary section outside Española, NM, which holds sedimentary indicators of past precipitation and runoff when atmospheric CO2 was much higher than today.

The world has cooled and atmospheric CO2 has declined over the past 50 million years (until humans showed up to the scene). We research modern weathering reactions and model the global carbon cycle to understand how weathering has influenced climate and how climate has influenced weathering during the Cenozoic.

How precipitation, evapotranspiration, and runoff will change in a warming world remains a pressing question. We investigate how these three hydroclimatic properties have changed during the past 50 million years.

Water stables isotopes provide fundamental data about where precipitation comes from and how that precipitation is partitioned into groundwater, streamflow, and plant water use. We are building a dataset of water isotopes in northern Colorado to track long-term changes in hydrology and climate.