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Changes in the physical climate system are known to perturb a variety of biological processes at a wide range of scales. Some of these processes are able in turn to influence climate by altering Earth's radiative balance, e.g., through the chemical composition of the atmosphere. The complexity of the resulting climate-biosphere interactions provides a rich array of phenomena to investigate. Such investigations are both intellectually challenging and socially relevant, as human activities increasingly alter Earth's climate and biological systems.

The fundamental purpose of my research is to contribute to a coherent understanding of the interactions between biogeochemical cycles and the climate system so that we may better understand past and predict future changes in the environment. Because these interactions involve diverse processes occurring on many spatial and temporal scales, numerical models with varying degrees of complexity are necessary for synthesizing and clarifying current understanding. To date my research has focused primarily on modeling connections between ocean biogeochemistry and climate from human to geological time scales. In each of my research themes, I strive to construct simple quantitative models that are guided by observational constraints and oriented toward conceptual understanding.

biodiversity | nitrogen | carbon | overview