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  • Geophysics  (3)
  • Computer Programming and Software  (1)
  • Superfluidity and superconductivity  (1)
  • 1
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    Anomalous dependence of c-axis polarized Fe B_{1g} phonon mode with Fe and Se concentrations in Fe_{1+y}Te_{1−x}Se_{x} (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-28
    Description: Author(s): Y. J. Um, A. Subedi, P. Toulemonde, A. Y. Ganin, L. Boeri, M. Rahlenbeck, Y. Liu, C. T. Lin, S. J. E. Carlsson, A. Sulpice, M. J. Rosseinsky, B. Keimer, and M. Le Tacon We report on an investigation of the lattice dynamical properties in a range of Fe 1+ y Te 1− x Se x compounds, with special emphasis on the c -axis polarized vibration of Fe with B 1 g symmetry, a Raman active mode common to all families of Fe-based superconductors. We have carried out a systematic study of ... [Phys. Rev. B 85, 064519] Published Mon Feb 27, 2012
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    High-Frequency Planetary Waves in the Polar Middle Atmosphere as seen in a data Assimilation System (2003)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: This study examines the winter southern hemisphere vortex of 1998 using four times daily output from a data assimilation system to focus on the polar 2-day, wave number 2 component of the 4-day wave. The data assimilation system products are from a test version of the finite volume data assimilation system (fvDAS) being developed at Goddard Space Flight Center (GSFC) and include an ozone assimilation system. Results show that the polar 2-day wave dominates during July 1998 at 70 degrees. The period of the quasi 2-day wave is somewhat shorter than 2 days (about 1.7 days) during July 1998 with an average perturbation temperature amplitude for the month of over 2.5 K. The 2-day wave propagates more slowly than the zonal mean zonal wind, consistent with Rossby wave theory, and has EP flux divergence regions associated with regions of negative horizontal potential vorticity gradients, as expected from linear instability theory. Results for the assimilation-produced ozone mixing ratio show that the 2-day wave represents a major source of ozone variation in this region. The ozone wave in the assimilation system is in good agreement with the wave seen in the POAM (Polar Ozone and Aerosol Measurement) ozone observations for the same time period. Some differences with linear instability theory are noted as well as spectral peaks in the ozone field, not seen in the temperature field, that may be a consequence of advection.
    Keywords: Geophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    DAO's Finite-volume/Physical-space Data Assimilation System: Stratospheric Applications (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: In this talk we describe the next-generation data assimilation system being developed at NASA's Data Assimilation Office (DAO), with emphasis on the applications to stratospheric forecasts and stratospheric constituent transport. This data assimilation system includes the General Circulation Model jointly developed by the DAO and the Climate and Global Dynamics Division (CGDD) at NCAR. This model is based on the finite-volume dynamical core) developed at DAO with physical parameterizations from the NCAR Climate Community Model. The Physical-space Statistical Analysis System (PSAS) is used to combine a first guess from the NASA-NCAR GCM with observational data to provide an updated estimate of the state of the atmosphere. Case studies for the (northern) Winter of 2000 will be discussed.
    Keywords: Geophysics
    Type: SPARC 2000; Nov 06, 2000 - Nov 10, 2000; Mar del Plata; Argentina
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Age-of-Air, Tape Recorder, and Vertical Transport Schemes (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: A numerical-analytic investigation of the impacts of vertical transport schemes on the model simulated age-of-air and the so-called 'tape recorder' will be presented using an idealized 1-D column transport model as well as a more realistic 3-D dynamical model. By comparing to the 'exact' solutions of 'age-of-air' and the 'tape recorder' obtainable in the 1-D setting, useful insight is gained on the impacts of numerical diffusion and dispersion of numerical schemes used in global models. Advantages and disadvantages of Eulerian, semi-Lagrangian, and Lagrangian transport schemes will be discussed. Vertical resolution requirement for numerical schemes as well as observing systems for capturing the fine details of the 'tape recorder' or any upward propagating wave-like structures can potentially be derived from the 1-D analytic model.
    Keywords: Computer Programming and Software
    Type: SPARDC; Nov 06, 2000 - Nov 10, 2000; Mar del Plata; Argentina
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Development of the Joint NASA/NCAR General Circulation Model (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The Data Assimilation Office at NASA/Goddard Space Flight Center is collaborating with NCAR/CGD in an ambitious proposal for the development of a unified climate, numerical weather prediction, and chemistry transport model which is suitable for global data assimilation of the physical and chemical state of the Earth's atmosphere. A prototype model based on the NCAR CCM3 physics and the NASA finite-volume dynamical core has been built. A unique feature of the NASA finite-volume dynamical core is its advanced tracer transport algorithm on the floating Lagrangian control-volume coordinate. The model currently has a highly idealized ozone production/loss chemistry derived from the observed 2D (latitude-height) climatology of the recent decades. Nevertheless, the simulated horizontal wave structure of the total ozone is in good qualitative agreement with the observed (TOMS). Long term climate simulations and NWP experiments have been carried out. Current up to date status and futur! e plan will be discussed in the conference.
    Keywords: Geophysics
    Type: NWP Conference; Sep 01, 1999; Denver, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
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