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  • 1975-1979  (17)
  • 1
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    Time-Continuous Assimilation of Remote-Sounding Data and Its Effect an Weather Forecasting (1979)
    American Meteorological Society
    Details
    Publication Date: 1979-02-01
    Print ISSN: 0027-0644
    Electronic ISSN: 1520-0493
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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  • 2
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    Free Oscillations in a Climate Model with Ice-Sheet Dynamics (1979)
    American Meteorological Society
    Details
    Publication Date: 1979-12-01
    Print ISSN: 0022-4928
    Electronic ISSN: 1520-0469
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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  • 3
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    Climate Stability for a Sellers-Type Model (1976)
    American Meteorological Society
    Details
    Publication Date: 1976-01-01
    Print ISSN: 0022-4928
    Electronic ISSN: 1520-0469
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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  • 4
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    A Balanced Diagnostic System Compatible with a Barotropic Prognostic Model (1977)
    American Meteorological Society
    Details
    Publication Date: 1977-10-01
    Print ISSN: 0027-0644
    Electronic ISSN: 1520-0493
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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  • 5
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    A statistical method for time-continuous assimilation of remote sounding temperatures (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: A time-continuous statistical method is presented for the four-dimensional assimilation of remote sounding temperatures based on radiometric measurements from polar-orbiting satellites. This method is applied to DST-6 data from the NOAA-4 and Nimbus-6 satellites. Experiments are reported in which the state of the atmosphere throughout the test period was determined using a varying amount of satellite data and in which different methods were used for their assimilation. Data from the NOAA-4 satellite only, from Nimbus-6 only, and from both satellites together were used; the methods tested include different variations of the statistical method as well as more traditional methods. The conclusions are that: (1) satellite-derived temperature data can have a modest, but statistically significant positive impact on numerical weather prediction in the two-to-three day range; (2) this impact is highly sensitive to the quantity of data available; and (3) the assimilation method plays a major role in the magnitude of the impact for the same data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center 3d NASA Weather and Climate Program Sci. Rev.; p 93-103
    Format: text
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  • 6
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    Wind laws for shockless initialization (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A system of diagnostic equations for the velocity field, or wind laws, was derived for each of a number of models of large-scale atmospheric flow. The derivation in each case is mathematically exact and does not involve any physical assumptions not already present in the prognostic equations, such as nondivergence or vanishing of derivatives of the divergence. Therefore, initial states computed by solving these diagnostic equations should be compatible with the type of motion described by the prognostic equations of the model and should not generate initialization shocks when inserted into the model. Numerical solutions of the diagnostic system corresponding to a barotropic model are exhibited. Some problems concerning the possibility of implementing such a system in operational numerical weather prediction are discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Deut. Wetterdienst Ann. of Meteorol. No. 11; p 112-115
    Format: text
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  • 7
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    Time-continuous assimilation of remote-sounding data and its effect on weather forecasting (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Methods were developed for the time-continuous assimilation of satellite-sounding temperature data: direct insertion method, asynoptic successive correction method, and local linear regression method. These methods were applied to DST-6 data from the operational and experimental temperature sounders aboard the NOAA 4 and Nimbus 6 satellites. Attention is given to a comparison of these methods and their effect on the accuracy of the initial states obtained, as well as the resulting forecasts generated from these initial states. The results suggest that (1) satellite-derived temperature data can have a modest though statistically significant positive impact on numerical weather prediction in the 2-3 day range; (2) the impact is highly sensitive to the quantity of data available; and (3) the method of satellite-data assimilation can substantially influence the magnitude of the impact obtained for the same data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review; 107; Feb. 197
    Format: text
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  • 8
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    Free oscillations in a climate model with ice-sheet dynamics (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A study of stable periodic solutions to a simple nonlinear model of the ocean-atmosphere-ice system is presented. The model has two dependent variables: ocean-atmosphere temperature and latitudinal extent of the ice cover. No explicit dependence on latitude is considered in the model. Hence all variables depend only on time and the model consists of a coupled set of nonlinear ordinary differential equations. The globally averaged ocean-atmosphere temperature in the model is governed by the radiation balance. The reflectivity to incoming solar radiation, i.e., the planetary albedo, includes separate contributions from sea ice and from continental ice sheets. The major physical mechanisms active in the model are (1) albedo-temperature feedback, (2) continental ice-sheet dynamics and (3) precipitation-rate variations. The model has three-equilibrium solutions, two of which are linearly unstable, while one is linearly stable. For some choices of parameters, the stability picture changes and sustained, finite-amplitude oscillations obtain around the previously stable equilibrium solution. The physical interpretation of these oscillations points to the possibility of internal mechanisms playing a role in glaciation cycles.
    Keywords: GEOSCIENCES (GENERAL)
    Type: Journal of the Atmospheric Sciences; 36; Dec. 197
    Format: text
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  • 9
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    An energy-balance model of glaciation cycles (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A one dimensional energy balance model is presented which contains a time lagged albedo to account for the delayed dependence of continental ice sheets on temperature; it also includes a smoothing of temperature gradients in the tropics to account for the effect of the Hadley circulation on the strong flattening of meridional temperature profiles there. The model exhibits finite amplitude, sustained free oscillations; these oscillations are triggered by a change in the insulation parameter and occur in the absence of any external forcing. This model behavior strongly suggests the possibility of an almost-intransitive mechanism playing a role in glaciation cycles. This behavior also occurs on shorter time scales which might be relevant to the interannual variability of the atmosphere.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: WMO Climate Models: Performance, Intercomparison and Sensitivity Studies, Vol. 2; p 886-916
    Format: text
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  • 10
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    The GISS sounding temperature impact test (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The impact of DST 5 and DST 6 satellite sounding data on mid-range forecasting was studied. The GISS temperature sounding technique, the GISS time-continuous four-dimensional assimilation procedure based on optimal statistical analysis, the GISS forecast model, and the verification techniques developed, including impact on local precipitation forecasts are described. It is found that the impact of sounding data was substantial and beneficial for the winter test period, Jan. 29 - Feb. 21. 1976. Forecasts started from initial state obtained with the aid of satellite data showed a mean improvement of about 4 points in the 48 and 772 hours Sub 1 scores as verified over North America and Europe. This corresponds to an 8 to 12 hour forecast improvement in the forecast range at 48 hours. An automated local precipitation forecast model applied to 128 cities in the United States showed on an average 15% improvement when satellite data was used for numerical forecasts. The improvement was 75% in the midwest.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-78063
    Format: application/pdf
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