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Four-Dimensional Model Assimilation of Data A Strategy for the Earth System Sciences (1991) / Chapter Skim
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2 Data Assimilation Development
Pages 16-20

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Select key terms on the right to highlight them within pages of the chapter.


From page 16...
... of the mass and horizontal velocity fields has emerged as yet (Haidvogel and Robinson, 19891. Scientific requirements are formulated in this report for improved atmospheric data assimilation; for oceanographic model-assimilated data sets of a quality at least comparable to present atmospheric model-assimilated data sets; and for complementary model-assimilated data sets on surface hydrol 16
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From page 17...
... Operational implementation of the OI approach requires resolution of a number of practical issues. It is difficult to invert a matrix corresponding to a global data set; up to now, a series of local calculations that involve a number of compromises on data selection, continuity between adjacent analysis volumes, multivanate relationships, and so on has been done.
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From page 18...
... Model-assimilated data sets are produced by a GCM, which may be either a spectral or grid model. The observational data are grouped beforehand into 2-hour windows.
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From page 19...
... , plus slower gravity modes and all Rossby modes associated with OI-determined incremental changes to the background values. The GCM assimilates these data immediately and produces a continuous stream of model-assimilated data sets.
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From page 20...
... This need is part of the nationally coordinated program presented in the president's fiscal year 1992 budget to Congress in a report by the Committee on Physical, Mathematical, and Engineering Sciences of the Federal Coordinating Council for Science, Engineering, and Technology of the Office of Science and Technology Policy: Grand Challenges: High Performance Computing and Communications. As the report's summary states: "The HPCC program is driven by the recognition that unprecedented computaiional power and capability [are]
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Key Terms

  • kalman filter
  • adjoint method
  • continuous data
  • background field
  • current operational

  • data insertion
  • operational implementation
  • scientific requirements
  • time scale
  • gravity wave

  • phase speed
  • time interval
  • forecast field
  • phase space
  • operational centers

  • assimilation methods
  • analysis step
  • global data
  • adjoint methods
  • current solution

  • earlier data
  • oceanographic applications
  • modes associated
  • rapidly propagating
  • gravity modes

  • scheme using
  • exploit linear
  • noise free
  • relative weights
  • past data


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