Institute of Arctic and Alpine Research
Secondary Core Area
Global change, paleoclimate dynamics, biogeochemistry
Ph.D. 1983 Columbia University
- Global scale climate and environmental dynamics.
- Carbon dioxide concentrations and climate from stable hydrogen isotopes peats and other organics.
- Climate from deuterium excess and hydrogen isotopes in ice cores.
- Isotopes in general circulation models.
- Modern carbon cycle dynamics via isotopes of carbon dioxide and methane.
Stable Isotope Lab:
I started the INSTAAR Stable Isotope Lab in 1989. In recent years, my research has helped to show that large climate changes tend to occur in the natural system as abrupt and rapid shifts in mode probably driven by internal adjustments in the Earth climate system, rather than slow and gradual adjustments to changing external conditions, such as the amount of energy received from the sun. My research has also helped to show that land plants are capable of removing large amounts of carbon dioxide from the atmosphere, amounts that equal our input of CO2 from fossil fuel burning on short time scales. Such large changes in the uptake of CO2 by plants is a key piece in the puzzle we must solve to address future CO2 levels and climate change.