| Application of an iterative variational method with balanced constraint to a hemispheric analysis and prediction - :12169 | National Weather Service (NWS)
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Application of an iterative variational method with balanced constraint to a hemispheric analysis and prediction
  • Published Date:
    1979
Filetype[PDF-1.65 MB]


Details:
  • Corporate Authors:
    National Meteorological Center (U.S.)
  • Description:
    "An iterative method of numerical variational analysis for adjusting wind and height fields at constant pressure surfaces has been under development at NMC. This variational method uses the general balance equation as the dynamic constraint, and principles of variational calculus to derive a system of "Euler-Lagrange" equations. The "Euler-Lagrange" equation are solved by the method of relaxation with proper boundary conditions. Solutions to the system of equations determine the magnitude of modification to the existing fields of wind and height on isobaric surfaces. The formulation of the variational method was described in detail in a previous NMC Office Note (Gerrity and Chu, 1978). In this paper, the application of this variational method to an actual case of hemispheric analyses and the resulting modifications to the analyses are reported. The modified analyses of isobaric wind and height fields are then used to replace the operationally analyzed fields, and to generate a 7-layer PE (Primitive Equation) model forecast up to 48 hours. The forecast fields made with the modified analyses are later compared with those generated with the operational analyses without modification"--Introduction.

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