Research Overview

My expertise is in the study of large-scale dynamical processes in the lower and middle atmosphere.  In my research, I apply modern diagnostic analysis methods to atmospheric observations and computer simulations of the atmosphere to ascertain the physical mechanisms responsible for large-scale atmospheric phenomena such as annular modes, regional climate variations, weather regimes, and winter storms.  The methods are based upon the physical principles governing the structure and evolution of potential vorticity, a fundamental dynamical measure of the atmospheric circulation.  I have particular research interests in the dynamical interaction between the stratosphere and the troposphere, the nature and physics of seasonal transitions, and the dynamics and simulation of adverse weather events.  One goal of my research is to provide knowledge for optimizing the skill of extended-range weather forecasts and regional climate predictions.  Another significant component of my research involves employing dynamical and statistical methods to validate the characteristics of large-scale phenomena simulated by general circulation models against observations.

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