The 1983-1984 evaluation of VAS data in the LFM
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The 1983-1984 evaluation of VAS data in the LFM

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    "This paper examines the effect of vertical profiles of temperature from the VISSR Atmospheric Sounder (VAS) aboard the GOES-6 upon numerical integrations of the operational version of Limited Fine-mesh Model (LFM) run routinely at the National Meteorological Center (NMC). Studies of this kind are often called "impact studies" and have been conducted in the past with regard to the effect of temperature sounding data from polar orbiter satellites upon hemispheric or global analyses and forecasts. Bonner, et al. (1976) concluded that VTPR data from the NOAA-2 satellite produced, at most, a slight improvement on hemispheric forecasts out to 48-hours. He further concluded this result to be due to the lack of VTPR data in meteorologically active region, such as baroclinic zones, where the existence of deep clouds normally preclude valid clear radiance measurements, Tracton, et al 1980, concluded that TIROS-N data reduced the spatial variance of hemispheric analyses of height and temperature. These studies all focused on VTPR or TIROS-N data, which were designed to be capable of resolving synoptic-scale features. VAS, on the other hand, was designed to describe atmospheric temperature and moisture profiles with spatial and temporal resolutions of about 90 km and one hour, respectively. Because VAS is stationary with respect to the earth's surface, soundings must be made over a limited area. This makes VAS a natural choice for use in limited area models, such as the LFM, and for delineating pre-convective environments. In preparation for such uses of VAS data, Chesters, et al., 1982 conducted a simulation study to determine whether the meteorologically useful results could be achieved. They concluded that VAS would indeed hear sufficient horizontal resolution to adequately describe the major features of severe storm enviornments. They further emphasized that the quality of the soundings in the lowest levels would be improved by using surface observations in calculating VAS radiances"--Introduction.
  • Content Notes:
    Edward A. O'Lenic.

    "February 1985."

    "This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members."

    System requirements: Adobe Acrobat Reader.

    Includes bibliographical references (page 24-25).

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