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Yang, M.-J ., D.-L. Zhang, X.-D. Tang, and Y. Zhang, J. Geophys . Res.

A modeling study of Typhoon Nari (2001) at landfall. Part II: Structural changes and terrain-induced asymmetries. Yang, M.-J ., D.-L. Zhang, X.-D. Tang, and Y. Zhang, J. Geophys . Res. Part I

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Yang, M.-J ., D.-L. Zhang, X.-D. Tang, and Y. Zhang, J. Geophys . Res.

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  1. A modeling study of Typhoon Nari (2001) at landfall. Part II: Structural changes and terrain-induced asymmetries. Yang, M.-J., D.-L. Zhang, X.-D. Tang, and Y. Zhang, J. Geophys. Res.

  2. Part I The effects of Taiwan topography on the track, intensity, and surface precipitation during the landfall of Nari.

  3. 2km grid • Cylindrical coordinates • (r, θ, z) • B.C.: outputs of 6km grid

  4. 24h 14h 30h Partial Landfall Stage Full Landfall Stage Ocean Stage Use minimum surface central pressureto determine the cyclone center. Use vortex circulation centerto determine the cyclone center.

  5. Topographic Effects on Landfall Structure

  6. Full terrain No terrain Ocean 21h 20h 22h

  7. Full terrain No terrain Ocean 21h 20h 22h

  8. Full terrain No terrain Ocean 21h 20h 22h

  9. Landfall

  10. Vortex Contraction after Landfall • Previous observational and modeling studies have documented contraction of the eye wall as a phenomenon of TC growth over the ocean [Willoughby et al., 1982; Willoughby and Black, 1996; Liu et al., 1999]

  11. Full terrain No terrain 50% terrain

  12. Eye Wall Breakdown after Landfall t=30h

  13. t=20h Higher- Lower-

  14. t=25h Higher- Lower-

  15. t=30h Higher- Lower-

  16. t=30h

  17. Conclusions • After landfall, the tangential flow is weakened but the low-level radial wind is strengthened , due to the terrain blocking and surface friction. • At the time of landfall, Nari shows stronger primary and secondary circulations in the presence of the CMR topography because of the enhanced latent heat release.

  18. RMW and midlevel eye wall updraft contract after landfall. When latent heating rates decrease, the inner core vortex size begins to increase and the storm weakens slowly. • The interaction of Nari’s vortex circulation with the elevated lower-air, combined with the CMR topographical lifting, accounts for most of the asymmetrical structures after landfall.

  19. Thank you for your listening!

  20. http://www.tlsh.tp.edu.tw/~t127/topographytaiwan/images/0101.jpghttp://www.tlsh.tp.edu.tw/~t127/topographytaiwan/images/0101.jpg

  21. (Fig. 20 in Part I)

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