Monday 12 Jan 2015Dynamics and Thermodynamics effects on Cloud Feedbacks

Paolo Ceppi - University of Washington

Harrison 103 15:00-16:00

Faithful simulation of cloud properties is particularly challenging in climate models, due to the small scale and complexity of the physical processes involved. Because of this, the cloud feedback is the dominant source of uncertainty in the climate response to greenhouse gas forcing in GCM simulations. This seminar will the contributions of dynamical and thermodynamical feedbacks to the cloud response. Our results suggest that temperature-driven phase changes in mixed-phase clouds are the dominant driver of the negative cloud feedback in mid and high latitudes with boundary-layer stability changes and jet stream shifts playing a secondary role.

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