pure and applied geophysics

, Volume 115, Issue 5–6, pp 1303–1333 | Cite as

Synoptic features and structures of some equatorial vortices over the South China Sea in the Malaysian region during the winter monsoon, December 1973

  • Boon Khean Cheang


In December 1973, Peninsular Malaysia and Sarawak experienced a few periods of heavy rain caused by westward moving equatorial vortices from the South China Sea. In this report, the synoptic characteristies associated with the development and intersification of these vortices are shown. Structure of one of the disturbances was examined. Disturbances in the trades associated with lateral shear were found to be important for the genesis of the equatorial vortices. However, the intensification of these disturbances depended on the interaction with the cold monsoon surge.

Key words

Monsoon Synoptic features Equatorial vortices 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Bryant, K. (1958),Comparison of months giving extremes of rainfall during northeast monsoon at Changi, Singapore Island, Meteor. Mag.87, 307–312.Google Scholar
  2. Burpee, R. W. (1972),The origin and structure of easterly waves in the lower troposphere of North Africa, J. Atmos. Sci.29, 77–90.Google Scholar
  3. Carlson, T. N. (1969a),Synoptic histories of three African disturbances that developed into Atlantic hurricanes, Mon. Wea. Rev.97, 256–276.Google Scholar
  4. Cheang, B. K. (1977),Structure of a cyclonic disturbance over the South China Sea and the Malaysian region during the winter Monsoon—to be published in the proceedings of International Symposium on Monsoons, New Delhi, India.Google Scholar
  5. Fett, R. W. (1966),Upper-level structure of the formative tropical cyclone, Mon. Wea. Rev.94, 9–18.Google Scholar
  6. Gan, t. L. (undated),A study of some heavy rainspells on the east coast of Malaya during the northeast monsoon season. Memoir of the Malayan Meteorological Service, No. 6.Google Scholar
  7. Holton, J. R.,An introduction to Dynamic Meteorology (Academic Press, New York, 1972), pp. 290–294.Google Scholar
  8. Krshnamurti, T. N. andPan, H. L. (1977),Long term variability in Monsoon flows over the lower troposphere—to be published in the Proceedings of International Symposium on Monsoons. New Delhi, India.Google Scholar
  9. Nitta, T. andYanai, M. (1969),A note on barotropic instability of the tropical easterly current, J. Meteor. Soc.47, 183–197.Google Scholar
  10. Palmer, C. E. (1952),Tropical meteorology, Quart. J. Roy. Met. Soc.78 (336), 126–164.Google Scholar
  11. Pedgley, D. E. andKrishnamurti, T. N. (1976),Structure and behaviour of a monsoon cyclone over West Africa, Mon. Wea. Rev.104 (2), 149–167.Google Scholar
  12. Ramage, C. S.,Monsoon Meteorology, (Academic Press, 1971), pp. 79–85.Google Scholar
  13. Reed, R. J. (1970),Structure and characteristics of easterly waves in the equatorial Western Pacific during July–August 1967, Proceedings of the Symposium on Tropical Meteorology 1970, University of Hawaii.Google Scholar
  14. Reed, R. J. andRecker, E. E. (1971),Structure and properties of synoptic-scale wave disturbances in the equatorial western Pacific, J. Atmos. Sci.28, 1117–1133.Google Scholar
  15. Riehl, H., Bell, G. J., Ramage, C. S., Augustin, E., Frost, R., Hastenrath, S., Krishnamurti, T. N. andVan der Boogard, H. M. E. (1969),The Diagnosis and prediction of SE Asia northeast monsoon weather, NWRF 12-0669-144, Navy Weather Research Facility.Google Scholar
  16. Sadler, J. C. (1967),On the origin of tropical vortices. Proceedings of the Working Panel on Tropical Dynamic Meteorological, August 1967, NWRF 12-1167-132, Navy Weather Research Facility, pp. 39–76.Google Scholar
  17. Sadler, J. C. (1970),Mean cloudiness and gradient-level-wind charts over the tropics, Vol. II: Charts Technical Report 215. Air Weather Service (MAC) United States Air Force.Google Scholar
  18. Wallace, J. M. andChang, C. P. (1969),Spectrum analysis of large-scale wave disturbances in the tropical lower troposphere, J. Atmos. Sci.26, 1010–1025.Google Scholar
  19. Watts, I. E. M.,Equatorial weather (University of London Press, 1955), pp. 97–98.Google Scholar
  20. Williams, K. T. (1970),A statistical analysis of satellite-observed trade wind cloud clusters in the western north Pacific, Atmospheric Science Paper No. 161. Department of Atmospheric Science, Colorado State University.Google Scholar
  21. Yanai, M., Maruyama, T., Nitta, T. andHayashi, Y. (1968),Power spectra of large-scale disturbances over the tropical Pacific, J. Meteor. Soc. Japan,46, 308–323.Google Scholar

Copyright information

© Birkhäuser Verlag 1977

Authors and Affiliations

  • Boon Khean Cheang
    • 1
  1. 1.Malaysian Meterological ServicePetaling JayaMalaysia

Personalised recommendations