Dennis L. Hartmann

Mt. Rainier from UW.

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Where are my former Ph.D. Students Now?

Academic Lineage of My Students Credit:EA Barnes

My research deals with low-frequency variability in the atmosphere and climate system, and with climate change.

My climate research focuses on the interaction of dynamics, radiation and cloud processes, and their role in determining the sensitivity of the global climate to forcings such as increasing carbon dioxide or aerosol burden. Recent work has resulted in a "Fixed Anvil Temperature" or FAT Hypothesis, that indicates that on the basis of fundamental physical processes that the temperature at the tops of tropical anvil clouds should remain about the same during climate change. This tends to decouple the emission temperature from the surface temperature. On the other hand, other arguments suggest that the net radiation at the top of the atmosphere in regions of tropical deep convection and nearby trade cumulus regions should be the same. This implies that the albedo of tropical convective anvils should increase with surface temperature. These considerations are based on large-scale energetic requirements and not on cloud microphysical arguments. More detail can be learned by reading the papers, which are available by clicking Research Papers in the bar to the left.

In the area of dynamics, I am currently interested in the atmospheric dynamical processes that give rise to intrinsic low-frequency variability, especially the interaction of transient and stationary waves with zonal jets in middle latitudes. This blends into a general discussion of "annular modes" of variability and the way they couple the troposphere and stratosphere, and may couple ozone depletion with greenhouse gas warming.

Descriptions of the classes I teach and some special publications also can be accessed from the bar at the left.

Thanks for visiting.

Professor D. L. Hartmann, Department of Atmospheric Sciences
Box 351640, University of Washington
Seattle, Washington 98195-1640
Tel: 206 543-7460, Fax: 206 685-9302
email: dhartm at washington dot edu

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