Impact of horizontal resolution on simulation of precipitation extremes in an aqua-planet version of the Community Atmosphere Model (CAM)

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One key question regarding current climate models is whether the projection of climate extremes converges to a realistic representation as the spatial and temporal resolutions of the model are increased. Ideally the model extreme statistics should approach a fixed distribution once the resolutions are commensurate with the characteristic length and time scales of the processes governing the formation of the extreme phenomena of interest. In this study, a series of AGCM runs with idealized 'aquaplanet-steady-state' boundary conditions have been performed with the Community Atmosphere Model CAM3 to investigate the effect of horizontal resolution on climate extreme simulations. The use of ... continued below

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Li, F.; Collins, W.D.; Wehner, M.F.; Williamson, D.L.; Olson, J.G. & Algieri, C. March 1, 2011.

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One key question regarding current climate models is whether the projection of climate extremes converges to a realistic representation as the spatial and temporal resolutions of the model are increased. Ideally the model extreme statistics should approach a fixed distribution once the resolutions are commensurate with the characteristic length and time scales of the processes governing the formation of the extreme phenomena of interest. In this study, a series of AGCM runs with idealized 'aquaplanet-steady-state' boundary conditions have been performed with the Community Atmosphere Model CAM3 to investigate the effect of horizontal resolution on climate extreme simulations. The use of the aquaplanet framework highlights the roles of model physics and dynamics and removes any apparent convergence in extreme statistics due to better resolution of surface boundary conditions and other external inputs. Assessed at a same large spatial scale, the results show that the horizontal resolution and time step have strong effects on the simulations of precipitation extremes. The horizontal resolution has a much stronger impact on precipitation extremes than on mean precipitation. Updrafts are strongly correlated with extreme precipitation at tropics at all the resolutions, while positive low-tropospheric temperature anomalies are associated with extreme precipitation at mid-latitudes.

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  • Journal Name: Tellus A; Journal Volume: 63; Journal Issue: 5; Related Information: Journal Publication Date: 2011

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  • Report No.: LBNL-4790E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.3402/tellusa.v63i5.15882 | External Link
  • Office of Scientific & Technical Information Report Number: 1050658
  • Archival Resource Key: ark:/67531/metadc828888

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 2011

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  • May 19, 2016, 9:45 a.m.

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  • Sept. 29, 2017, 5:36 p.m.

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Li, F.; Collins, W.D.; Wehner, M.F.; Williamson, D.L.; Olson, J.G. & Algieri, C. Impact of horizontal resolution on simulation of precipitation extremes in an aqua-planet version of the Community Atmosphere Model (CAM), article, March 1, 2011; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc828888/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.