Response of precipitation extremes to global warming in an aqua-planet climate model: towards robust projection from regional to global scales

Details Response of precipitation extremes to global warming in an aqua-planet climate model: towards robust projection from regional to global scales Response of precipitation extremes to global warming in an aqua-planet climate model: towards robust projection from regional to global scales

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgc51k..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GC51K-01

Physics

[1622] Global Change / Earth System Modeling, [1817] Hydrology / Extreme Events

Scientific paper

Robust projection of precipitation extremes is essential for human society to prepare for future climate change. To understand the inconsistencies of the projections across the climate models, a series of idealized “aquaplanet” AGCM runs have been performed with CAM3 to investigate the effects of horizontal resolution on precipitation extreme projections under two simple global warming scenarios. The absence of orography helps diagnose the response of the physics responsible for extreme rainfall to change with resolution. Results show that a uniform increase of sea surface temperature (SST) and an increase of low-to-high latitude SST gradient both lead to increase of precipitation and precipitation extremes for most latitudes. The perturbed SSTs generally have stronger impacts on precipitation extremes compared with mean precipitation. Model horizontal-resolution strongly affects the global warming signals in the extreme precipitation in the low-mid latitudes, but not in high latitude regions. This study illustrates the need for resolution-invariant treatment of atmospheric processes.

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