rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Numerical modeling of a rotating cumulonimbus cloud
  name:
    name part: Smith, David Ray.
    role:
      role term: creator
  name:
    name part: Bell, Jon G.
    role:
      role term: degree committee member.
  name:
    name part: Brundidge, Kenneth C.
    role:
      role term: degree committee member.
  name:
    name part: Das, Phanindramohan
    role:
      role term: degree supervisor.
  name:
    name part: Scoggins, James R.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses.
  origin info:
    place:
      place term: txu
    date issued: 1979
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xii, 118 leaves : illustrations ; 29 cm
  abstract: The processes leading to the extreme concentration of vorticity that accompany the formation of a tornado are not well understood. One of the steps in this process appears to be the concentration and vertical propagation of available vorticity in a rotating mesoscale convective system. An attempt is made to understand the vorticity concentration process through a numerical study o f a two-dimensional, axisymmetric, and time-dependent model of a rotating convective cloud. The numerical model consists of the three equations of motion, a thermodynamic equation, a set of continuity equations for the water substances (water vapor, cloud water droplets, ice crystals, rain and hail), a diagnostic nondimensionalized pressure equation, and appropriate boundary conditions. These equations are solved numerically by use of centered differences in space and time on a 16 km by 16 km grid. The grid spacing is 500 m and most calculations use a time step of 1 second. Two experiments are performed in this study. A nonprecipitating cloud with rotation induced in the outer half of the domain is constructed. A precipitating cloud is also generated with the same characteristics of the previous cloud, except the autoconversion process is activated to produce precipitation-size hydrometeors. The numerical model produces features of convective clouds consistent with the two-dimensional axisymmetric model of Soong and Ogura (1973), although that model does not contain rotation. Furthermore, the present model extends the work of Leslie and Smith (1979) by the incorporation of cloud-microphysical processes and by the extension of the spatial dimensions. In experiments which examine both precipitating and nonprecipitating clouds, the vertical gradient in vertical velocity is accompanied by a radial inflow which is responsible for increasing the vorticity in the vicinity of the core of the cloud. In the precipitating case, drag created by the precipitation hydrometeors enhances the downdraft in …
  note: "Major subject: Meteorology."
  note: Vita.
  note: Texas A & M University
  note: Includes bibliographical references (leaves 114-117).
  subject:
    topic: Clouds
  subject:
    topic: Cumulonimbus
  subject:
    topic: Thunderstorms
  subject:
    topic: Tornadoes
  subject:
    topic: Major meteorology
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-55023
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-55023
  record info:
    record content source: TXA
    record creation date: 800611
    record change date: 20220104090813.0
    record identifier: in00000051846
    language of cataloging:
      language term: eng