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  • Other Sources  (4)
  • 1990-1994  (4)
  • 1980-1984
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  • 1
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    Application of a monotonic upstream-biased transport scheme to three-dimensional constituent transport calculations (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The application of van Leer's scheme, a monotonic, upstream-biased differencing scheme, to three-dimensional constituent transport calculations is shown. The major disadvantage of the scheme is shown to be a self-limiting diffusion. A major advantage of the scheme is shown to be its ability to maintain constituent correlations. The scheme is adapted for a spherical coordinate system with a hybrid sigma-pressure coordinate in the vertical. Special consideration is given to cross-polar flow. The vertical wind calculation is shown to be extremely sensitive to the method of calculating the divergence. This sensitivity implies that a vertical wind formulation consistent with the transport scheme is essential for accurate transport calculations. The computational savings of the time-splitting method used to solve this equation are shown. Finally, the capabilities of this scheme are illustrated by an ozone transport and chemistry model simulation.
    Keywords: GEOPHYSICS
    Type: Monthly Weather Review (ISSN 0027-0644); 119; 2456-246
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On the sensitivity of a residual circulation model to differences in input temperature data (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The residual mean circulation (RMC) formulation of zonally averaged transport in the middle atmosphere produces a circulation which depends on the distributions of net diabatic heating and temperature. Such circulations are from two temperature data sets, using the same radiative transfer code (Rosenfield et al. 1987). These circulations are then used to transport N2O in a photochemical model. The circulations and the resulting N2O distributions are notably different during the Northern Hemisphere winter, with that based on the NMC temperatures producing too much upward transport in the tropical stratosphere, as judged by comparison with the stratospheric and mesoscale sounder data. The experiment demonstrates that model calculations, in general, and perturbation assessments, in particular, are likely to be quite sensitive to the choice of input temperature data (where this is not computed self-consistently). It also reveals what appears to be a seasonally dependent bias in NMC zonally averaged temperatures with respect to those obtained from the LIMS instrument during 1978/1979.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 873-882
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fast two-dimensional model (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A two dimensional (altitude and latitude) model of the atmosphere is used to investigate problems relating to the variability of the dynamics and temperature of the atmosphere on the ozone distribution, solar cycle variations of atmospheric constituents, the sensitivity of model results to tropospheric trace gas sources, and assessment computations of changes in ozone related to manmade influences. In a comparison between two dimensional model results in which the odd nitrogen family was transported together and model results in which the odd nitrogen species was transported separately, it was found that the family approximations are adequate for perturbation scenario calculations.
    Keywords: GEOPHYSICS
    Type: NASA, Washington, NASA Upper Atmosphere Research Program: Research Summaries 1988-1989; p 209-210
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Stratosphere chemistry in a 2-D model with residual circulation (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objective of this research was to examine the effects of chemical perturbations on the stratosphere using models which can incorporate fully interactive radiative, chemical, and dynamical responses, in the context of a zonally averaged model. Model runs for the unperturbed, chlorine-perturbed and simultaneously chlorine-and CO2-perturbed cases were completed using the JPL-87 chemical kinetics data. The base case was analyzed and submitted for publication. The perturbed cases show substantial sensitivity of the predicted column ozone depletion to the perturbations affecting lower stratosphere temperature, but less to far dynamical perturbations. The column ozone distribution changed substantially when the kinetics data was changed. This implies a greater-than-expected uncertainty in predicted latitude distributions of ozone depletion, due to uncertainty about the accuracy and completeness of the chemical kinetics data set.
    Keywords: GEOPHYSICS
    Type: NASA, Washington, NASA Upper Atmosphere Research Program: Research Summaries 1988-1989; p 207-208
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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