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UID:20250514T075735EDT-6602jsAAfz@132.216.98.100
DTSTAMP:20250514T115735Z
DESCRIPTION:Sensitivity of Tropical Cyclone Intensification to Axisymmetric
  Heat Sources Part I: The Role of Inertial Stability\n\nThe processes resp
 onsible for changes in the intensity of a tropical cyclone (TC) remain not
  well understood. It has been suggested that the location of latent heat r
 elease by deep convection\, relative to the distribution of the inertial s
 tability of the mean azimuthal flow\, affects significantly the accelerati
 on of the tangential wind in TCs. Specifically\, when heating occurs in re
 gions of high inertial stability in a hurricane vortex\, the acceleration 
 of the tangential wind becomes more pronounced.  However\, there are two p
 athways for the acceleration to take place. The thermodynamic ``efficiency
 '' pathway stipulates that large inertial stability stiffens the radial in
 flow to decrease the strength of the diabatically forced secondary circula
 tion. As a result\, the adiabatic cooling associated with the upward branc
 h of the secondary circulation decreases and more of the imposed heating i
 s available to locally warm the air column. Through the thermal wind relat
 ion\, the tangential wind accelerates. On the other hand\, the ``dynamic''
  pathway stipulates that higher inertial stability implies higher relative
  vorticity and larger radial transport of angular momentum to spin up the 
 tangential wind. Whether one pathway prevails over the other is not always
  clear.  The main purpose of this study is to elaborate on how latent heat
  release in higher inertial stability regions results in larger tangential
  wind acceleration in TCs. Specifically\, the relative contribution of the
 ``efficiency'' versus the``dynamic'' route will be addressed using a three
 -dimensional\, nonlinear\, dry\, and fully compressible primitive equation
 s model. The model is initialized with a balanced axisymmetric vortex with
  a prescribed heat source to mimic convection in the eyewall region. A ser
 ies of sensitivity experiments on varying the strength of the initial vort
 ex and the magnitude of the prescribed heat source are conducted. Azimutha
 l momentum budget calculations will be presented with the analysis aided b
 y the application of the Sawyer-Eliassen equation. Our results indicate th
 at the contribution of the ``efficiency'' pathway to intensification is no
 n-negligible but remains sub-dominant. The spin up of the low-level tangen
 tial wind is always dominated by the azimuthal mean radial advection of ab
 solute vorticity.\n
DTSTART:20160217T193000Z
DTEND:20160217T200000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: Georgina Paull
URL:/meteo/channels/event/student-seminar-georgina-pau
 ll-255074
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