Idealized Model Simulations to Determine Impacts of Storm‐Relative Winds on Differential Reflectivity and Specific Differential Phase Fields
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Idealized Model Simulations to Determine Impacts of Storm‐Relative Winds on Differential Reflectivity and Specific Differential Phase Fields

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Details:

  • Journal Title:
    Journal of Geophysical Research: Atmospheres
  • Personal Author:
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)
  • Description:
    Hydrometeors of varying sizes have different fall speeds; for example, larger raindrops have greater fall speeds than smaller raindrops. The resultant differential sedimentation leads to differences in residence time in a sorting layer where drops can be advected by the storm‐relative winds. The resulting size sorting has an effect on the polarimetric radar variables including specific differential phase KDP and differential reflectivity ZDR. This study uses a simple numerical model of raindrop size sorting to analyze and further elucidate the relationship between the storm‐relative winds and the ZDR and KDP fields. Increased mean storm‐relative winds lead to increased ZDR magnitudes and decreased KDP magnitudes. The separation distance between ZDR and KDP maxima is proportional to the magnitude of the mean storm‐relative wind and the orientation of a vector from ZDR to KDP maxima is aligned with the mean storm‐relative wind over the sorting layer. Further, it is shown that larger values of storm‐relative helicity are associated with greater separation distances and separation orientations approaching orthogonal to the shear vector over the sorting layer.
  • Keywords:
  • Source:
    Journal of Geophysical Research: Atmospheres, 125(24)
  • DOI:
  • ISSN:
    2169-897X;2169-8996;
  • Format:
    PDF
  • Publisher:
    American Geophysical Union (AGU)
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA19OAR4590222
  • Rights Information:
    Other
  • Compliance:
    Library
  • Main Document Checksum:
  • Download URL:
  • File Type:

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