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

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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.

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  1. Bryant, K. (1958),Comparison of months giving extremes of rainfall during northeast monsoon at Changi, Singapore Island, Meteor. Mag.87, 307–312.

  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.

  3. Carlson, T. N. (1969a),Synoptic histories of three African disturbances that developed into Atlantic hurricanes, Mon. Wea. Rev.97, 256–276.

  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.

  5. Fett, R. W. (1966),Upper-level structure of the formative tropical cyclone, Mon. Wea. Rev.94, 9–18.

  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.

  7. Holton, J. R.,An introduction to Dynamic Meteorology (Academic Press, New York, 1972), pp. 290–294.

  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.

  9. Nitta, T. andYanai, M. (1969),A note on barotropic instability of the tropical easterly current, J. Meteor. Soc.47, 183–197.

  10. Palmer, C. E. (1952),Tropical meteorology, Quart. J. Roy. Met. Soc.78 (336), 126–164.

  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.

  12. Ramage, C. S.,Monsoon Meteorology, (Academic Press, 1971), pp. 79–85.

  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.

  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.

  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.

  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.

  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.

  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.

  19. Watts, I. E. M.,Equatorial weather (University of London Press, 1955), pp. 97–98.

  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.

  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.

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Cheang, B.K. Synoptic features and structures of some equatorial vortices over the South China Sea in the Malaysian region during the winter monsoon, December 1973. PAGEOPH 115, 1303–1333 (1977). https://doi.org/10.1007/BF00874411

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Key words

  • Monsoon
  • Synoptic features
  • Equatorial vortices