Characterization of internal inertia gravity wave over a low latitude: results from the RONAC-2012 campaign

  • K. N. Uma
  • Siddarth Shankar DasEmail author
  • K. Kishore Kumar
  • K. V. Subrahmanyam
  • G. Ramkumar
Original Paper


High height resolution GPS sonde measurements have been utilized to understand the characteristics of internal inertia gravity waves (IGWs) over a low-latitude station Trivandrum (8.5°N, 76.9°E) during an intensive campaign “Research on OrganisatioN of Atmospheric convection (RONAC), which was initiated to understand the organization of convective systems during the Indian summer monsoon (ISM). GPS sondes had been launched at every 3 hourly intervals for a period of 10 days before the onset of ISM from 23 May to 1 June 2012. This unique dataset is utilized to understand the characteristics of IGW over this latitude where the effect of the Coriolis force is minimum. Observations show that the onset of tropical easterly jet (TEJ) was established well before the onset of ISM. Internal IGW activity with ~ 78 h periodicity associated with TEJ was observed in the upper troposphere and lower stratosphere (UTLS) regions. We have reconstructed the time series of winds to understand the propagation characteristics and employed Stokes parameter method to extract the other wave parameters. Vertical and horizontal wavelengths of ~ 2.3 km and ~ 2620 km were observed, respectively. The significance of the present study lies in the characterization of internal IGW over Trivandrum for the first time, which will be an important addition to the present understanding of the IGW and hence to the gravity wave community.



The authors acknowledge all the scientific and technical staff of the Space Physics Laboratory (SPL) and Meteorological Facility, Vikram Sarabhai Space Centre, Trivandrum, who participated in the RONAC campaign. Thanks to Dr. Radhika Ramchandran, Director, SPL for her constant supports extended during this study. Authors gratefully acknowledge both the reviewers and Editor-in-chief for their valuable comments and suggestions for the improvement of the manuscript. RONAC campaign data can be obtained on request to the Principal investigator.


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • K. N. Uma
    • 1
  • Siddarth Shankar Das
    • 1
    Email author
  • K. Kishore Kumar
    • 1
  • K. V. Subrahmanyam
    • 1
  • G. Ramkumar
    • 1
  1. 1.Space Physics LaboratoryTrivandrumIndia

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