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An approach to the development of more general quasi-geostrophic models
  • Published Date:
Filetype[PDF - 2.32 MB]

  • Personal Authors:
  • Corporate Authors:
    United States, Weather Bureau,
  • Series:
    Office note (Joint Numerical Weather Prediction Unit (U.S.)) ; no. 2
  • Document Type:
  • Description:
    "A series of 120 numerical forecasts computed by GRD in 1954 indicated that large errors were often traceable to:(a) Errors in arbitrarily specified lateral boundary conditions (b) Errors in lower boundary condition (effect of large scale irregularities of terrain omitted) (c) Possibly truncation errors, and (d) Probably defects of the physical Models themselves. It was also concluded that genuine differences between physically different models (in this case, the barotropic and two-parameter baroclinic models) were obscured by (a) and (c). At that time, it appeared essential to remove (a) and (c) before (b) and (d) could be effectively isolated. Since then, it has been found that the principal manifestations of truncation error are (1) a systematic underestimate of the bulk displacement of pressure systems and (2) the generation of spurious, but random small-scale fluctuations which eventually contaminate the entire calculation. "--Page 1.

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