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The Robust Dynamical Contribution to Precipitation Extremes in Idealized Warming Simulations across Model Resolutions. Objective

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Impact

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  1. The Robust Dynamical Contribution to Precipitation Extremes in Idealized Warming Simulations across Model Resolutions • Objective • Evaluate the response of precipitation extremes to global-warming-like sea surface temperature warming with different model resolutions to inform the interpretation of the projections made by the full climate models • Approach • Perform aqua-planet model experiments with multiple horizontal resolutions • Separate out the dynamic and thermodynamic components of the simulation • Scale the response of the precipitation percentiles into thermodynamic and dynamical factors conditioned on extreme precipitation occurring PNNLscientists provide a new insight into the mechanisms for the change of precipitation extremes by quantifying the dynamical contribution to it. • Impact • This study offers a fresh perspective for interpreting the change of precipitation extremes under global warming forcing • Provides a rationale for and adds confidence in the manyfoldincrease in the frequency of the most extreme categories of events in the mid-to-high latitudes found by the IPCC’s Fifth Assessment. Lu J, LR Leung, Q Yang, G Chen, WD Collins, F Li, ZJ Hou, and X Feng. 2014. “The Robust Dynamical Contribution to Precipitation Extremes in Idealized Warming Simulations across Model Resolutions.” Geophysical Research Letters, 41: 2971–2978. DOI:10.1002/2014GL059532.

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