My research covers a range of topics in atmospheric chemistry from air quality to climate change. Our group has been a leader in the development of global 3-D models and in the exploitation of satellite data to quantify emissions and transport. We have led NASA aircraft missions in many remote parts of the world to … Continued
My research focuses on the physics and chemistry of materials at conditions of extremely high pressures and temperatures. In geophysical research, high-pressure science illuminates the composition and dynamics of Earth and planetary interiors, while in chemistry and materials science our lab harnesses the same extreme conditions found deep inside planets to explore new phase space, … Continued
I specialize in low-temperature aqueous and radiogenic isotope geochemistry. My group’s research combines fieldwork, laboratory experiments, and modeling to quantify chemical, physical, and biological phenomena that cycle elements and their isotopes at the Earth’s surface. Many activities use isotopes to probe the compositional evolution of the Earth, at timescales spanning the geological to modern-day. Other … Continued
My research interests lie in developing a better understanding of the climate system using theory and data to explore past changes and possible futures.
My group carries out research in computational geodynamics to provide a basis for interpreting geological and geophysical observations made on local, regional, and global scales. Our goal is to understand how plate tectonics works, how plate tectonics and deep mantle flow are related, how and why mantle convection evolves over long time periods, and how … Continued
I do research on seismic and electromagnetic fields and waves in complex Earth media. My research spans forward and inverse modeling, data analysis and processing for subsurface imaging with an emphasis on characterization and monitoring of reservoirs, especially for applications to continuous monitoring of carbon sequestration in geological reservoirs. My research group, the Wave Physics … Continued
Metabolic activity imparts diagnostic stable isotopic signatures into biomass and geochemical phases in the environment. In my research, I use the stable isotopic signatures of carbon and sulfur species to reconstruct the presence and activity of specific metabolic pathways and processes in natural environments. Specifically, these measurements are used to probe (micro)-biological activity and its … Continued
The rock record reveals that life has been a conspicuous part of our planet for at least the last 3.5 billion years, and thus, the history of the Earth is inseparable from the history of life on Earth. We study the coevolution of life and Earth surface environments through diverse and fundamental transitions in Earth … Continued
As the Earth’s atmosphere warms, its climate is moving towards a state unlike any recorded by instrumental data. The change is affecting all major elements of the climate system, from the deep ocean to the stratosphere, and from the tropics to high latitudes, which presents a host of challenges and unresolved questions to the scientific … Continued
My focus is on reconstructing the supercontinents that preceded Pangea: Rodinia (900-700 million years ago) and Nuna (1600-1400 million years ago). I use paleomagnetism, the magnetic directions preserved in ancient rocks from the time that they formed, to map the locations of continental fragments through time. My work has elucidated long-term characteristics of Earth’s magnetic … Continued