Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

The Possible Mechanism on the Formation and Intensification of the Maximum Wind Core in Tropical Cyclone

Zhong, Zhong;Wang, Xiao-Ting;Zhang, Jin-Shan

  • Published : 20070500
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Abstract

In this paper, the possible mechanism on the formation of the maximum wind core (MWC) in inner-core area of tropical cyclone (TC) is analyzed by use of the simulation output of Winnie (1997) before its landfall with the triply-nested meso-scale model MM5 (V3), as well as the contribution of of MWC both in its rapid rotation and trochoidal oscillation periods. The results show that the intensification and the position of the MWC, acompanied with the intensification of symetric flow, are generally dominated both by the phase and the amplitude of asymmetric flow at wavenumber 1, whereas asymmetric flow at higher wavenumber plays a secondary role. The symmetric flow is the main portion of MWC, which covers more than 80% of the wind speed, and the in-tensification of MWC is usually consistent with that of sy of asymetric flow, namely, axisymmetrization process of TC. The possible mechanism for the intensification and position of MWC is caused by the non-synchronous rotation and the superposition of asymmetric waves within the inner-core of TC, respectively, and the more the rotation of MWC, the less the intensification of TC, however, it does seem that the intensification of MWC becomes violent when it is in the trochoidal oscillation period.

Keywords

References

  1. Bosart, L. F., C. S. Velden, W. E. Bracken, J. Molinari, and P. G. Black, 2000: Environmental influence on the rapid intensification stage of hurricane Opal (1995) over the Gulf of Mexico. Mon. Wea. Rev., 128, 322-352 https://doi.org/10.1175/1520-0493(2000)128<0322:EIOTRI>2.0.CO;2
  2. Chen, L. S., and Z. X., Luo, 1995: Some relations between asymmetric structure and motion of typhoon. ACTA Meteorologica Sinica, 9, 411-419
  3. Chen, L. S., and Z. X., Luo, 1998: Numerical study on function affecting tropical cyclone structure and motion. ACTA Meteorological Sinica, 12, 504-512.
  4. Elsberry, R. L., K. A. Emanuel, G. Holland, H. Gerrish, M. Demaria, and C. Guard, 1992: Is there any hope for tropical cyclone intensity prediction? A panel discussion. Bull. Amer. Meteor. Soc., 73, 264-275 https://doi.org/10.1175/1520-0477-73.3.264
  5. Fiorino, M., and R. L. Elsberry, 1989: Some aspects of vortex structure in tropical cyclone motion. J. Atmos. Sci., 46, 1257-1265
  6. Hong, X., S. W. Chang, S. Raman, L. K. Shay, and R. Hodur, 2000: The interaction between hurricane Opal (1995) and a warm-core ring in the Gulf of Mexico. Mon. Wea. Rev., 128, 1347-1365 https://doi.org/10.1175/1520-0493(2000)128<1347:TIBHOA>2.0.CO;2
  7. Jorgensen, D. P., 1984: Mesoscale and convective-scale characteristics of mature hurricanes. Part II: Inner core structure of Hurricane Allen (1980). J. Atmos. Sci., 41, 1287-1311 https://doi.org/10.1175/1520-0469(1984)041<1287:MACSCO>2.0.CO;2
  8. Montgomery, M. T., and R. J. Kallenbach, 1997: A theory for vortex Rossby-waves and its application to spiral band and intensity changes in hurricanes. Quart. J. Roy. Meteor. Soc., 123, 435-465 https://doi.org/10.1002/qj.49712353810
  9. Reasor, P. D., and M. T. Montgomer, 2000: Low-wavenumber structure and evolution of the hurricane inner core observed by airborne dual-Doppler radar. Mon. Wea. Rew., 128, 1653-1680 https://doi.org/10.1175/1520-0493(2000)128<1653:LWSAEO>2.0.CO;2
  10. Shea, D. J., and W. M. Gray, 1973: The hurricane inner core region. I: Symmetric and asymmetric structure. J. Atmos. Sci., 30, 1544-1564 https://doi.org/10.1175/1520-0469(1973)030<1544:THICRI>2.0.CO;2
  11. Smith, G. S., and M. T. Montgomery, 1995: Vortex axisymmetriczation and its dependence on azimuthal wavenumber or asymmetric radial structure changes. Quart. J. Roy. Meteor. Soc., 121, 1615-1650 https://doi.org/10.1002/qj.49712152707
  12. Wang, Y., 2002: Vortex Rossby waves in a numerically simulated tropical cyclone. Part II: The role in tropical cyclone structure and intensity change. J. Atmos. Sci., 59, 1239-1262 https://doi.org/10.1175/1520-0469(2002)059<1239:VRWIAN>2.0.CO;2
  13. Wang, Y., and C. C. WU, 2004: Current understanding of tropical cyclone structure and intensity changes - a review. Meteo. Atmos. Phys., 87, 257-278 https://doi.org/10.1007/s00703-003-0055-6
  14. Wang, Y., and G. J. Holland, 1996: Tropical cyclone motion and evolution in vertical shear. J. Atmos. Sci., 53, 3313-3332 https://doi.org/10.1175/1520-0469(1996)053<3313:TCMAEI>2.0.CO;2
  15. Wu, C. C., and H. J. Cheng, 1999: An observational study of environmental influences on the intensity changes of typhoons Flo (1990) and Gene (1990). Mon. Wea. Rev., 127, 3003-3031 https://doi.org/10.1175/1520-0493(1999)127<3003:AOSOEI>2.0.CO;2
  16. Xu, Y. M., and R. S. WU, 2005: The numerical simulation of the genesis of tropical cyclone Bilis (2000): The evolution and transformation of asymmetric momentum. Chinese J. of Atmos. Sci., 29, 79-90
  17. Zhong, Z., and J. S. Zhang, 2006: Explicit simulation on the track and intensity of tropical cyclone Winnie (1997). J. of Hydrodynamics, 18,641-652