Tropical Cyclone Structure

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Tropical Cyclone Structure. MM5 Simulation of Hurricane Andrew Courtesy of Da-Lin Zhang at Univ. Maryland. Outline. Basic Circulations and Structure Primary Circulation Secondary Circulation Thermal Structure Basic Components of a Mature Hurricane Eye Eyewall - PowerPoint PPT Presentation

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  • TropicalM. D. EastinTropical Cyclone StructureMM5 Simulation of Hurricane Andrew Courtesy of Da-Lin Zhang at Univ. Maryland

    M. D. Eastin

  • TropicalM. D. EastinOutlineBasic Circulations and Structure

    Primary Circulation Secondary Circulation Thermal Structure

    Basic Components of a Mature Hurricane

    Eye Eyewall Rainbands Low-Level Inflow Upper-Level Outflow

    Tropical Cyclones as a Carnot Cycle

    Differences between Tropical and Mid-Latitude Cyclones

    Fun Facts about Tropical Cyclones

    M. D. Eastin

  • TropicalM. D. EastinTC CirculationsPrimary Circulation:

    The horizontal (or tangential) circulation that results from horizontal pressure gradients

    Secondary Circulation:

    The radial and vertical (or transverse) circulation that results from friction, low-level convergence, and buoyancy in the eyewall and rainbands

    M. D. Eastin

  • TropicalM. D. EastinTC Primary CirculationTangential Wind Field:

    Maximum is near the surface in the eyewall Magnitude is a function of the local horizontal pressure gradient (i.e. cyclostrophic balance) Cyclonic flow throughout most of the troposphere Anticyclonic flow aloft at larger radii (>100 km) In thermal wind balance with the storms temperature fieldTangential Wind and Pressure at 4 km altitudeRadius Height Cross SectionTangential Wind FieldPositive values are cyclonic (or counter-clockwise)

    Negative values are anticyclonic (or clockwise)EyewallEyewallEye

    M. D. Eastin

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    Pressure

    Vt

    Radius (km)

    Tangential Wind (m/s)

    Pressure (mb)

    Hypsometric

    Hypsometric Calculation

    ConstantsParametersLower LayerUpper Layer

    g9.81z215000p1900p1550

    R287p2125p2550p2200

    rho1.275T-bar-28psfc1013

    T'T'+Tbarp1Case 1

    0.0245.01013.37dTd(dz)dpsfcPsfc

    0.5245.51009.06Upper8236.76-29.61-

    1.0246.01004.79Lower8115.26-14.42-

    1.5246.51000.55Total-352.02-44.03968.97

    2.0247.0996.35

    2.5247.5992.18Case 2

    3.0248.0988.04dTd(dz)dpsfcPsfc

    3.5248.5983.94Upper12355.14-44.42-

    4.0249.0979.87Lower457.63-7.21-

    4.5249.5975.84Total-412.77-51.63961.37

    5.0250.0971.83

    5.5250.5967.86Case 3

    6.0251.0963.93dTd(dz)dpsfcPsfc

    6.5251.5960.02Upper4118.38-14.81-

    7.0252.0956.14Lower12172.89-21.63-

    7.5252.5952.30Total-291.27-36.43976.57

    8.0253.0948.49