DynVar – Diagnostic MIP Dynamics and Variability of the Stratosphere‐Troposphere System Co-Chairs:

Goal of the MIP and a brief overview DynVar focuses on the interactions between atmospheric variability, dynamics and climate change, with a particular emphasis on the two-way coupling between the troposphere and the stratosphere. The key questions addressed by the activity are: • How do dynamical processes contribute to persistent model biases in the mean state and variability of the atmosphere, including biases in the position, strength, and statistics of blocking events, storm tracks and the stratospheric polar vortex? • How does the stratosphere affect climate variability at intra-seasonal, inter-annual and decadal time scales? • What is the role of dynamics in shaping the atmospheric circulation response to anthropogenic forcings (e.g. global warming, ozone depletion) and how do dynamical processes contribute to uncertainty in future climate projections? An overview of the proposed experiment Rather then proposing new experiments, we are requesting additional output, critical for understanding the role of atmospheric dynamics in both present and past climate