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Pure and Applied Geophysics

, Volume 170, Issue 12, pp 2369–2381 | Cite as

Impact of South China Sea Cold Surges and Typhoon Peipah on Initiating Cyclone Sidr in the Bay of Bengal

  • Naresh Krishna Vissa
  • A. N. V. SatyanarayanaEmail author
  • B. Prasad Kumar
Article

Abstract

In the present study, an attempt was made to understand the role of South China Sea (SCS) convection associated with northerly cold surges and Typhoon Peipah in initiating Cyclone Sidr in the Bay of Bengal (BoB). The variation of air sea fluxes during the entire history of Cyclone Sidr tracking before its landfall over Bangladesh was also studied. The presence of cold surges in the north SCS associated with heavy rainfall episodes has been noticed at the southern Gulf of Tonkin coast prior to the formation of Typhoon Peipah. Subsequently, these surges migrated south, which resulted in intensification of a deep convection on reaching the Vietnamese coast. During the same period in the western Pacific, Typhoon Peipah developed, propagating in the westward direction and entering the SCS. Analysis of geostationary water vapour images, mean sea level pressure, and surface wind maps clearly depicted the transport of convective cloud clusters, moisture, and westward momentum from Typhoon Peipah to the deep convection cells over the SCS. Consequently, the existing deep convection over the Vietnamese coast resulted in a westward direction and entered the Gulf of Thailand and Andaman Sea. The availability of higher latent heat fluxes, warmer sea surface temperatures, and suitable atmospheric conditions over this region favoured the formation of a tropical depression in the Andaman Sea. This depression further intensified in the southeast BoB, resulting in the formation of Cyclone Sidr. NCEP/NCAR wind fields and air-sea fluxes revealed left asymmetry surface winds and higher latent heat flux on the left side of the track during the intensification phase of Sidr.

Keywords

South China sea cold surges deep convection Typhoon Peipah Sidr cyclone 

Notes

Acknowledgments

Mr. Naresh Krishna Vissa would like to acknowledge the Council of Scientific and Industrial Research (CSIR), New Delhi, for funding the research and the Indian Institute of Technology Kharagpur for providing necessary facilities to conduct PhD work. We are thankful to the anonymous reviewers for their constructive suggestions, improving the quality of the manuscript.

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Copyright information

© Springer Basel 2013

Authors and Affiliations

  • Naresh Krishna Vissa
    • 1
  • A. N. V. Satyanarayana
    • 1
    Email author
  • B. Prasad Kumar
    • 2
  1. 1.Centre for Oceans, Rivers, Atmosphere and Land SciencesIndian Institute of TechnologyKharagpurIndia
  2. 2.Department of Ocean Engineering and Naval ArchitectureIndian Institute of TechnologyKharagpurIndia

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