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  • 1990-1994  (4)
  • 1975-1979  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    An isentropic vertical coordinate model: Design and application to atmospheric frontogenesis studies (1992)
    Springer
    Meteorology and atmospheric physics 50 (1992), S. 31-45 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary The isentropic vertical coordinate model developed at UCLA is briefly reviewed. The review includes an outline of the approach used to overcome technical difficulties in handling model layers with small mass. The model's performance is demonstrated by simulating the evolution of a middle-latitude baroclinic disturbance. During the evolution of the disturbance, sharp frontal zones are generated in the upper and middle troposphere with realistic tropopause folding. The extent to which different dynamical processes contribute to frontogenesis is analyzed. While the model successfully simulates frontogenesis in the upper and middle troposphere, it has a difficulty in simulating surface fronts. The difficulty arises due to the lack of degrees of freedom in surface temperatures since an isentropic vertical coordinate model requires a large number ofvertical layers to obtain a highhorizontal resolution at the lower boundary. This suggests the potential of a hybrid vertical coordinate, which approaches θ at upper levels and σ at lower levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025503
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Trypanosoma congolense: the in vitro akinetoplastic induction sensitivity assay (1992)
    Springer
    Parasitology research 78 (1992), S. 136-141 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Incubation ofTrypanosoma conglense in diminazene aceturate (Berenil) or isometamidium chloride (Samorin) induced akinetoplastic (AK) forms in vitro. The AK values (expressed in percent) obtained were found to be useful for rapid assessment of relative drug sensitivities. In susceptible clones, AK forms were induced at all drug concentrations tested, whereas in resistant clones they were induced only at higher concentrations. The Berenil-resistant clone exhibited AK values of 0.9%±0.6%–8.9±2% at concentrations of 1–100 μg/ml at 4–10 h post-inoculation (p.i.), whereas the Berenil-susceptible clone displayed values of 9.3%±3%–19.2%±5% at 0.1–50 μg/ml. Motile trypanosomes were not seen at 100 μg/ml at 4 h p.i. or at 10 or 50 μg/ml at 10 h p.i. The Samorin-resistant clone showed AK values of 0.5%±0.1%–43%±3% at concentrations of 0.1–100 μg/ml at 4 and 10 h p.i., whereas the Samorin-susceptible clone exhibited values of 5.3%±2%–45%±4% at 0.0005–100 μg/ml. These results were supported by the findings obtained using a mouse infectivity test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931655
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    Paper (German National Licenses)
    Fulltext
  • 3
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    An isentropic vertical coordinate model: Design and application to atmospheric frontogenesis studies (1992)
    Springer
    Details
    Publication Date: 1992-01-01
    Print ISSN: 0177-7971
    Electronic ISSN: 1436-5065
    Topics: Geography , Physics
    Published by Springer
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    PAPER CURRENT
  • 4
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    Automated infrared imaging temperature measurement with application to upward flame spread studies. Part I (1993)
    Elsevier
    Details
    Publication Date: 1993-02-01
    Print ISSN: 0010-2180
    Electronic ISSN: 1556-2921
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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    PAPER CURRENT
  • 5
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    Numerical simulation of flow near steep mountains with a potential enstrophy conserving scheme for the shallow water equations (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Numerical experiments show that use of a potential enstrophy conserving scheme drastically improves numerical simulation of flow near steep mountains.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center 3d NASA Weather and Climate Program Sci. Rev.; p 111-115
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Computational design of the basic dynamical processes of the UCLA general circulation model (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The 12-layer UCLA general circulation model encompassing troposphere and stratosphere (and superjacent 'sponge layer') is described. Prognostic variables are: surface pressure, horizontal velocity, temperature, water vapor and ozone in each layer, planetary boundary layer (PBL) depth, temperature, moisture and momentum discontinuities at PBL top, ground temperature and water storage, and mass of snow on ground. Selection of space finite-difference schemes for homogeneous incompressible flow, with/without a free surface, nonlinear two-dimensional nondivergent flow, enstrophy conserving schemes, momentum advection schemes, vertical and horizontal difference schemes, and time differencing schemes are discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    An energy and potential enstrophy conserving scheme for the shallow water equations (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A three-dimensional finite difference scheme for the solution of the shallow water momentum equations which accounts for the conservation of potential enstrophy in the flow of a homogeneous incompressible shallow atmosphere over steep topography as well as for total energy conservation is presented. The scheme is derived to be consistent with a reasonable scheme for potential vorticity advection in a long-term integration for a general flow with divergent mass flux. Numerical comparisons of the characteristics of the present potential enstrophy-conserving scheme with those of a scheme that conserves potential enstrophy only for purely horizontal nondivergent flow are presented which demonstrate the reduction of computational noise in the wind field with the enstrophy-conserving scheme and its convergence even in relatively coarse grids.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Numerical Weather Prediction; Oct 29, 1979 - Nov 01, 1979; Silver Spring, MD
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    July simulation by the UCLA general circulation model (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of a July simulation produced by the UCLA general circulation model are analyzed with a view to improving the model. It is shown that while many features of the July climatology are well reproduced, others, such as the intensity of the jet streams in the upper troposphere, the frequency of cyclogenesis, the structure of the subtropical pressure belt in the Southern Hemisphere, and the precipitation are not well reproduced. It is suggested that the sources of error are related to inadequate vertical and horizontal resolutions, to the choice of upper boundary at 50 mb, to poor representation of topographically forced motions, and to the indirect coupling between the general circulation model and the planetary boundary model. The analysis has led to the introduction of major design changes in the model.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Numerical Weather Prediction; Oct 29, 1979 - Nov 01, 1979; Silver Spring, MD
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Description and preliminary results of the 9-level UCLA general circulation model (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The 9-level general circulation model, with the upper boundary of 50 mb, is a modification of the earlier 6- and 12-level versions used at UCLA. Two major design changes have been made in an effort to improve the model: (1) a potential enstrophy conserving scheme in the equation of motion has replaced the previous scheme which only conserved enstrophy for nondivergent flow, and (2) the treatment of the planetary boundary layer has been modified by making the predicted planetary boundary layer top a coordinate surface. Experiments with idealized steep mountains have been made to test each of the major modifications, and the model is now ready for general circulation simulation experiments.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Numerical Weather Prediction; Oct 29, 1979 - Nov 01, 1979; Silver Spring, MD
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Numerical methods used in atmospheric models (1976)
    Global Atmospheric Research Programme (GARP)
    In:  GARP Publications Series, 17 . Global Atmospheric Research Programme (GARP), 64 pp.
    Details
    Publication Date: 2020-08-03
    Description: Methods used for the solution of hydrodynamic governing equations in numerical models of the atmosphere are discussed. In particular grid point finite difference methods and problems and methods used for time and horizontal space differencing are covered. Specific problems relating to the numerical solution of the advection and gravity wave equations are discussed. Volume 1
    Type: Report , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
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