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Global Tropospheric Chemistry A Plan for Action (1984) / Chapter Skim
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6 THE ROLE OF MODELING IN UNDERSTANDING TROPOSPHERIC CHEMICAL PROCESSES
Pages 94-100

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From page 94...
... The system model has two basic functions. First, because it has maximized the number of variables it calculates, it provides a good opportunity to carry out exten 94 sive comparisons between the model calculated versus observed variables of the system; such comparisons help identify weaknesses in the individual process models.
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From page 95...
... At one extreme are meteorologically oriented models that obtain the motions ofthe atmosphere and temperature structure as three-dimensional time-varying fields by solution of the continuum equations of hydrodynamics and therrnodynamics in response to realistic boundary conditions; however, these models have until recently approximated tropospheric chemistry by ignoring all species except water. Some studies are now under way using the winds generated by some regional and global meteorological models to provide transport for simplified chemical models.
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From page 96...
... provide submodels to be used in a comprehensive three-dimensional meteorological model coupled to global tropospheric chemistry. By contrast, the global distributions and long-range transport program would be used to help validate the overall performance of the chemical aspects of comprehensive three-dimensional models of tropospheric chemical processes.
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From page 97...
... Field programs, together with continuation of laboratory (i.e., wind tunnel) studies should provide the data needed to develop and refine models of oceanic gas transfer processes, in particular for those species where surface boundary layers within the ocean provide additional resistance to their flux between ocean and atmosphere.
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From page 98...
... The major deficiency in the understanding of fast-photochemical transformations lies in the lack of laboratory and field data. For instance, concentrations of key species such as OH, HO2, and H2O2 have not been reliably measured, and kinetic data of many key reaction rate constants have not been determined under tropospheric conditions.
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From page 99...
... As discussed in the previous section, major advances in measurement technology and theoretical treatment are needed in this area. Modeling Global Distributions and Long-Range Transport with a Three-Dimensional Meteorological Model A three-dimensional model of tropospheric chemical processes linked to meteorological and climatic processes or, in brief, a Tropospheric Chemistry System Model (TCSM)
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From page 100...
... (1983~. Regional models ofthe atmosphere in middle latitudes (a review)
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Key Terms

  • tropospheric chemical
  • mixed layer
  • global tropospheric
  • chemical species
  • global distributions

  • boundary conditions
  • chemical models
  • meteorological model
  • smog chambers
  • chemistry program

  • chemical transformations
  • deposition models
  • chemical processes
  • meteorological processes
  • atmospheric mixed

  • acid deposition
  • transport subprogram
  • quality models
  • ofthe atmosphere
  • water vapor

  • surface boundary
  • modeling studies
  • meteorological models
  • transport processes
  • biological source

  • oxidation products
  • individual process
  • chemistry usually
  • nitrogen compounds
  • average emissions


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