Plant-atmosphere interactions; Environmental influence on the exchange of trace gases and energy between land ecosystem and the atmosphere; Climatic influence on the natural abundance of carbon; Oxygen and hydrogen isotopes in CO2, H2O and organic materials; Scaling biological processes from cellular to global scales.
Analytical chemistry of the atmosphere. Aerosol physics and chemistry including surface and heterogeneous chemistry. Aerosol-climate interactions, Nanoparticle chemistry in the atmosphere.
Using remote sensing to study the radiation transfer in the atmosphere, cloud microphysics, inversion of the physical properties of the clouds and aerosols.
Remote sensing and patterns and texture in clouds are also used to estimate manmade impacts on the radiation and the thermodynamic balance of the atmosphere, as well as on the water cycle.
Integration of laboratory and field studies with theoretical models to understand flow of water, and transport of conservative and reactive chemicals, from the ground surface, through the unsaturated zone, and within saturated geological formations.
Transport in porous media.
Development of chemical methods for remediation of contaminated water.
Global climate change reconstructions from stable isotope records in marine and continental sediments; Southern Ocean paleoceanography.
Oxygen isotopes in biogenic silica; Stable isotopes in diatom records; Carbon and oxygen stable isotopes in corals.
Geophysical fluid dynamics. Atmospheric dynamics on Earth and other planets. The general circulation of atmospheres and oceans. Climate dynamics and climate change. The role of turbulence and instabilities in the energetics of the atmosphere. Storm track dynamics and variability. Dynamics of jets and vortices on giant planets. Dynamics of planetary interiors. Inferring the deep circulation on giant planets from gravity science. Research incorporates theory, numerical modeling and observational analysis to understand the governing physics.
Planetary geology, geophysics, dynamics, and climate history. Integration of spacecraft observations, laboratory simulations, theoretical and numerical models, to better understand processes acting in planetary environments. Focus on the history, stability and exchange of water and other volatiles. Exploration of the surfaces of Mars, Moon, Mercury, Titan and other bodies.
Research is driven by questions about the evolution of global biogeochemical cycles, their effect on the chemical composition and oxidation state of atmospheres and hydrospheres, and their interaction with planetary climate on multiple timescales. Observations of the geological and geochemical record, laboratory experiments, theory and numerical models are used to investigate a wide range of topics in the chemical evolution of planetary surface environments.