His current research interests center on using trapped bubbles of gases contained in ice cores to track changes in ancient climate.

Research Topics: Biogeochemistry and Greenhouse Gases, Climate Sciences, Ice in the Climate System, Past Climate Change, Southern Ocean and High-Latitude Climate Studies

Research Interests
Quantification of abrupt temperature changes using measurements of nitrogen and argon isotopes in ice cores
Mechanisms of millennial-scale climate oscillations and climate bifurcations
Pleistocene global carbon cycle variations deduced from oxygen and noble gas measurements in ice cores
Reconstructing changes in atmospheric noble gas composition over the past million years from air trapped in glacial ice
Radiocarbon of methane in late glacial-age ice as a test of the sedimentary methane clathrate degassing hypothesis.
Isotopic fractionation of air in polar firn (snow) due to gravitational settling and thermal diffusion, with implications for gas age-ice age differences and leads and lags of climate versus greenhouse gases in ice core records