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  • METEOROLOGY AND CLIMATOLOGY  (60)
  • Dynamics, dynamical systems, lattice effects
  • 1
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    Effect of long- and short-range order on SiGe alloy thermal conductivity: Molecular dynamics simulation (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-05-15
    Description: Author(s): Christopher H. Baker and Pamela M. Norris We report the role of long- and short-range order on the thermal conductivity and mode relaxation times of a model Si 0.5 Ge 0.5 alloy using molecular dynamics simulation. All interactions used the Stillinger-Weber potential and the Si and Ge atoms differed only by their mass. The simulated alloys were... [Phys. Rev. B 91, 180302(R)] Published Tue May 12, 2015
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Mapping the chemical potential landscape of a triple quantum dot (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-27
    Description: Author(s): M. A. Broome, S. K. Gorman, J. G. Keizer, T. F. Watson, S. J. Hile, W. J. Baker, and M. Y. Simmons We investigate the nonequilibrium charge dynamics of a triple quantum dot and demonstrate how electron transport through these systems can give rise to nontrivial tunneling paths. Using a real-time charge sensing method, we establish tunneling pathways taken by particular electrons under well-define… [Phys. Rev. B 94, 054314] Published Fri Aug 26, 2016
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Magnetoelastic coupling in bulk and nanoscale MnO (2011)
    American Physical Society (APS)
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    Publication Date: 2011-07-06
    Description: Author(s): Q.-C. Sun, S. N. Baker, A. D. Christianson, and J. L. Musfeldt Phonons are exquisitely sensitive to finite length scale effects because they are intimately connected to charge, structure, and magnetism, and a quantitative analysis of their behavior can reveal microscopic aspects of spin-lattice interaction. To investigate these effects in a model correlated oxi... [Phys. Rev. B 84, 014301] Published Tue Jul 05, 2011
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Application of the wavelet transform to nanoscale thermal transport (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-09-21
    Description: Author(s): Christopher H. Baker, Donald A. Jordan, and Pamela M. Norris The continuous wavelet transform is employed to analyze the dynamics and time-dependent energy distribution of phonon wave-packet propagation and scattering in molecular dynamics simulations. The equations of the one-dimensional continuous wavelet transform are presented and then discretized for imp... [Phys. Rev. B 86, 104306] Published Thu Sep 20, 2012
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Lidar-measured winds from space: A key component for weather and climate prediction (1995)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The deployment of a space-based Doppler lidar would provide information that is fundamental to advancing the understanding and prediction of weather and climate. This paper reviews the concepts of wind measurement by Doppler lidar, highlights the results of some observing system simulation experiments with lidar winds, and discusses the important advances in earth system science anticipated with lidar winds. Observing system simulation experiments, conducted using two different general circulation models, have shown (1) that there is a significant improvement in the forecast accuracy over the Southern Hemisphere and tropical oceans resulting from the assimilation of simulated satellite wind data, and (2) that wind data are significantly more effective than temperature or moisture data in controlling analysis error. Because accurate wind observations are currently almost entirely unavailable for the vast majority of tropical cyclones worldwide, lidar winds have the potential to substan- tially improve tropical cyclone forecasts. Similarly, to improve water vapor flux divergence calculations, a direct measure of the ageostrophic wind is needed since the present level of uncer- tainty cannot be reduced with better temperature and moisture soundings alone.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: American Meteorological Society, Bulletin (ISSN 0003-0007); 76; 6; p. 869-888
    Format: text
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  • 6
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    Observing system simulation experiments at NASA. Goddard Space Flight Center (1985)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: A series of realistic simulation studies is being conducted as a cooperative effort between the European Centre for Medium Range Weather Forecasts (ECMWF), the National Meteorological Center (NMC), and the Goddard Laboratory for Atmospheres (GLA), to provide a quantitative assessment of the potential impact of future observing systems on large scale numerical weather prediction. A special objective is to avoid the unrealistic character of earlier simulation studies. Following a brief review of previous simulation studies and real data impact tests, the methodology for the current simulation system will be described. Results from an assessment of the realism of the simulation system and of the potential impact of advanced observing systems on numerical weather prediction and preliminary results utilizing this system will be presented at the conference.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Proceedings of the NASA Symposium on Global Wind Measurements; p 65-71
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  • 7
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    The analysis sensitivity to tropical winds from the Global Weather Experiment (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The global scale divergent and rotational flow components of the Global Weather Experiment (GWE) are diagnosed from three different analyses of the data. The rotational flow shows closer agreement between the analyses than does the divergent flow. Although the major outflow and inflow centers are similarly placed in all analyses, the global kinetic energy of the divergent wind varies by about a factor of 2 between different analyses while the global kinetic energy of the rotational wind varies by only about 10 percent between the analyses. A series of real data assimilation experiments has been performed with the GLA general circulation model using different amounts of tropical wind data during the First Special Observing Period of the Global Weather Experiment. In exeriment 1, all available tropical wind data were used; in the second experiment, tropical wind data were suppressed; while, in the third and fourth experiments, only tropical wind data with westerly and easterly components, respectively, were assimilated. The rotational wind appears to be more sensitive to the presence or absence of tropical wind data than the divergent wind. It appears that the model, given only extratropical observations, generates excessively strong upper tropospheric westerlies. These biases are sufficiently pronounced to amplify the globally integrated rotational flow kinetic energy by about 10 percent and the global divergent flow kinetic energy by about a factor of 2. Including only easterly wind data in the tropics is more effective in controlling the model error than including only westerly wind data. This conclusion is especially noteworthy because approximately twice as many upper tropospheric westerly winds were available in these cases as easterly winds.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 114; 991-1007
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  • 8
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    Analysis/forecast experiments with a flow-dependent correlation function using FGGE data (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The use of a flow-dependent correlation function to improve the accuracy of an optimum interpolation (OI) scheme is examined. The development of the correlation function for the OI analysis scheme used for numerical weather prediction is described. The scheme uses a multivariate surface analysis over the oceans to model the pressure-wind error cross-correlation and it has the ability to use an error correlation function that is flow- and geographically-dependent. A series of four-day data assimilation experiments, conducted from January 5-9, 1979, were used to investigate the effect of the different features of the OI scheme (error correlation) on forecast skill for the barotropic lows and highs. The skill of the OI was compared with that of a successive correlation method (SCM) of analysis. It is observed that the largest difference in the correlation statistics occurred in barotropic and baroclinic lows and highs. The comparison reveals that the OI forecasts were more accurate than the SCM forecasts.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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  • 9
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    Analysis/forecast experiments with a multivariate statistical analysis scheme using FGGE data (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A three-dimensional, multivariate, statistical analysis method, optimal interpolation (OI) is described for modeling meteorological data from widely dispersed sites. The model was developed to analyze FGGE data at the NASA-Goddard Laboratory of Atmospherics. The model features a multivariate surface analysis over the oceans, including maintenance of the Ekman balance and a geographically dependent correlation function. Preliminary comparisons are made between the OI model and similar schemes employed at the European Center for Medium Range Weather Forecasts and the National Meteorological Center. The OI scheme is used to provide input to a GCM, and model error correlations are calculated for forecasts of 500 mb vertical water mixing ratios and the wind profiles. Comparisons are made between the predictions and measured data. The model is shown to be as accurate as a successive corrections model out to 4.5 days.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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  • 10
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    Simulation studies of the impact of future observing systems on weather prediction (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The features and preliminary results from a simulation system being implemented to develop realistic estimates of the impacts future data acquisition systems will have on large-scale numerical weather simulation are described. The new instruments may include advanced passive IR and microwave satellite sensors, as well as active scatterometer and lidar sounders. A main goal of the impact study is to identify those sensor systems which will provide the most benefit. The realism of the study is being enhanced by assimilating as much real-world data as possible and generating global weather maps for comparison with maps generated on the bases on the projected new, higher resolution data. Early results have indicated a preference for higher resolution wind data than for temperature data for making 1-5 day forecasts. The prime instrument candidate for collecting the data is lidar, provided the sensor resolution design goals are met.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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