Zhang_April 15 - Experimental Design Experimental Design Ω...

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GLACE: The Global Land- Atmosphere Coupling Experiment. Part I: Overview Wenxian Zhang School of Earth and Atmospheric Sciences Georgia Institute of Technology
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Background Precipitation  Land surface moisture Numerical models vs. observations AGCMs Model dependence
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Background Land-atmosphere coupling strength K02: Four-model intercomparison (Koster et al., 2002) - Four independent AGCM modeling groups - One-month simulation - The same time series of surface prognostic variables - Quantification of the response of precipitation - A marked disparity in the coupling strength
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Motivations To quantify the land-atmosphere coupling strength of the twelve AGCMs - Participation from a wider range of models - Separation of the effects of “fast” and “low” reservoirs - Effect on air temperature To document the coupling strengths of the participating models for future study
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Experimental Design Three ensemble - Write - Read - Subsurface Sixteen members 1 June – 31 August 1994 The same SST
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Unformatted text preview: Experimental Design Experimental Design Ω Diagnostic • Time series of six-day totals • P(t): 14 six-day totals for each simulation • :The ensemble mean time series • :The temporal standard deviation • :The standard deviation of the ensemble mean time series ( ) P t t 16 1 1 ( ) ( ) 16 i i P t P t t = = p σ P Ω Diagnostic • The degree to which the sixteen precipitation time series generated by the ensemble members are similar • The relative contributions of boundary forcing and internal chaotic variability to the generation of precipitation 2 2 2 16 15 P P p P σ-Ω = Ω Diagnostic Figure 2 of Koster et al., 2002: Time series of precipitation produced by NSIPP’s R ensemble. (top) Grid cell for which Ω is high. (bottom) Grid cell for which Ω is low Ω Diagnostic Precipitation Conclusions • The range of coupling strengths is large. • The multimodel “hot spots” of land-atmosphere coupling is determined....
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This note was uploaded on 11/07/2011 for the course EAS 8803 taught by Professor Staff during the Spring '08 term at Georgia Institute of Technology.

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Zhang_April 15 - Experimental Design Experimental Design Ω...

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