Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

The Robust Dynamical Contribution to Precipitation Extremes in Idealized Warming Simulations Across Model Resolutions

TitleThe Robust Dynamical Contribution to Precipitation Extremes in Idealized Warming Simulations Across Model Resolutions
Publication TypeJournal Article
Year of Publication2014
AuthorsLu, Jian, L. Leung Ruby, Yang Qing, Chen Gang, Collins William D., Li Fuyu, Z Hou Jason, and Feng Xuelei
JournalGeophysical Research Letters
Volume41
Number8
Pages2971-2978
Abstract / Summary

The impact of the circulation shift under climate warming on the distribution of precipitation extremes and the associated sensitivity to model resolution are investigated using Community Atmosphere Model Version 3.0 in an aquaplanet configuration. The response of the probability density function of the precipitation to a uniform sea surface temperature warming can be interpreted as superimposition of a dynamically induced poleward shift and a thermodynamically induced upward shift toward higher intensities, which give rise to manyfold increase in the frequency of the most extreme categories of the precipitation events at the poleward side of the midlatitude storm track. Coarser resolutions underestimate not only the intensity of the precipitation extremes but also the dynamical contribution to the increase of precipitation extremes. Meanwhile, the thermodynamic contribution to the intensification of the precipitation extremes is substantially less than expected from the Clausius‐Clapeyron relation, implicative of significant change in the vertical structure of the precipitation processes.

URLhttps://doi.org/10.1002/2014GL059532
DOI10.1002/2014GL059532
Journal: Geophysical Research Letters
Year of Publication: 2014
Volume: 41
Number: 8
Pages: 2971-2978
Publication Date: 04/2014

The impact of the circulation shift under climate warming on the distribution of precipitation extremes and the associated sensitivity to model resolution are investigated using Community Atmosphere Model Version 3.0 in an aquaplanet configuration. The response of the probability density function of the precipitation to a uniform sea surface temperature warming can be interpreted as superimposition of a dynamically induced poleward shift and a thermodynamically induced upward shift toward higher intensities, which give rise to manyfold increase in the frequency of the most extreme categories of the precipitation events at the poleward side of the midlatitude storm track. Coarser resolutions underestimate not only the intensity of the precipitation extremes but also the dynamical contribution to the increase of precipitation extremes. Meanwhile, the thermodynamic contribution to the intensification of the precipitation extremes is substantially less than expected from the Clausius‐Clapeyron relation, implicative of significant change in the vertical structure of the precipitation processes.

DOI: 10.1002/2014GL059532
Citation:
Lu, J, L 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(8): 2971-2978.  https://doi.org/10.1002/2014GL059532.