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Low Frequency Atmospheric Variability in GFS Models

Low Frequency Atmospheric Variability in GFS Models. Peitao Peng Acknowledgment: Bhaskar, Arun and Huug. Purposes. The performance of GFS models in simulating the low frequency variability (LFV) of the atmosphere; Differences between the two versions of GFS models in LFV;

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Low Frequency Atmospheric Variability in GFS Models

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  1. Low Frequency Atmospheric Variability in GFS Models Peitao Peng Acknowledgment: Bhaskar, Arun and Huug

  2. Purposes • The performance of GFS models in simulating the low frequency variability (LFV) of the atmosphere; • Differences between the two versions of GFS models in LFV; • Dynamical interpretation of the differences.

  3. Data Model: Monthly Z200 and Prate from the AMIP-type runs (1949-2002) with GFS1 and GFS2. (Note: the difference between GFS1 and GFS2 is that they uses different radiation packages) OBS: Monthly Z200 from NCEP reanalysis (1949-2002)

  4. Mechanism: “bias” in tropical heating Pacific jet eastward extension LFV eastward shifting

  5. Summary • Either version of the GFS models can generate very realistic LFV patterns. • Some differences in LFV patterns between the two models can be explained the “bias” in tropical heating.

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