A Multiscale Numerical Study of Hurricane Andrew 1992' Part IV: Unbalanced Flows

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A Multiscale Numerical Study of Hurricane Andrew
(1992).Part IV Unbalanced Flows

• Speaker ??
• Liu et al., 2001. Mon. Wea. Rev., 129, 92-107.

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Introduction

• The structure and development of unbalanced
  forces and flows in hurricanes.
• The analyses of the radial momentum and absolute
  angular momentum (AAM) budgets.
• Azimuthal momentum eq.
• AAM eq.

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relative cyclostrophic force imbalance
simulated winds
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Summary

• AAM is near-conserved three-dimensionally in the
  eyewall.
• the MBL inflow is the major source of AAM for the
  spinup of the storm.
• Supergradient flows and forces, even after being
  temporally and azimuthally averaged, are well
  organized from the bottom of the eye center to
  the upper outflow layer in the eyewall.
• the hurricane vortex flows evolve very slowly
  even during its rapid deepening stage.
• The azimuthheight cross sections of
  instantaneous fields display significant
  asymmetries but well-organized wavenumber-2
  structures in the form of vortexRossby waves.