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Baroclinic effects on the distribution of tropical cyclone eye subsidence



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  • Journal Title:
    Frontiers in Earth Science
  • Personal Author:
  • NOAA Program & Office:
  • Description:
    Solutions of the secondary (transverse) circulation equation for an axisymmetric, gradient balanced vortex are used to better understand the distribution of subsidence in the eye of a tropical cyclone. This secondary circulation equation is derived using both the physical radius coordinate r and the potential radius coordinate R. In the R-coordinate version, baroclinic effects are implicit in the coordinate transformation and are recovered in the final step of transforming the solution for the streamfunction Ψ back from R-space to r-space. Two types of elliptic problems for Ψ are formulated: 1) the full secondary circulation problem, which is formulated on 0 ≤ R < ∞, with the diabatic forcing due to eyewall convection appearing on the right-hand side of the elliptic equation; 2) the restricted secondary circulation problem, which is formulated on 0 ≤ R ≤ Rew, where the constant Rew is the potential radius of the inside edge of the eyewall, with no diabatic forcing but with the streamfunction specified along R = Rew. The restricted secondary circulation problem can be solved semi-analytically for the case of vertically sheared, Rankine vortex cores. The solutions identify the conditions under which large values of radial and vertical advection of θ are located in the lower troposphere at the outer edge of the eye, thereby producing a warm-ring thermal structure.
  • Keywords:
  • Source:
    Frontiers in Earth Science, 10
  • DOI:
  • ISSN:
    2296-6463
  • Format:
    PDF
  • Publisher:
    Frontiers Media SA
  • Document Type:
    Journal Article
  • License:
  • Rights Information:
    CC BY
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha-512:055fc29eb45d7aea541877cc332dd5ec0c8bf1b9b7ddf422d428e61760aa037e69cb36f3302707aa04bf2c1260cabfee9179da7265141c0fdb1b2546b8eeada6
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  • File Type:
    Filetype[PDF - 4.07 MB ]
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