Journal of Earth System Science

, Volume 120, Issue 2, pp 311–319

Atmospheric stability index using radio occultation refractivity profiles

  • D Jagadheesha
  • B Manikiam
  • Neerja Sharma
  • P K Pal
Article

DOI: 10.1007/s12040-011-0053-x

Cite this article as:
Jagadheesha, D., Manikiam, B., Sharma, N. et al. J Earth Syst Sci (2011) 120: 311. doi:10.1007/s12040-011-0053-x
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Abstract

A new stability index based on atmospheric refractivity at ~500 hPa level and surface measurements of temperature, pressure and humidity is formulated. The new index named here as refractivity based lifted index (RLI) is designed to give similar results as traditionally used lifted index derived from radiosonde profiles of temperature, pressure and humidity. The formulation of the stability index and its comparison with the traditional temperature profile based lifted index (LI) is discussed. The index is tested on COSMIC radio occultation derived refractivity profiles over Indian region. The forecast potential of the new index for rainfall on 2°×2° latitude–longitude spatial scale with lead time of 3–24 hours indicate that the refractivity based lifted index works better than the traditional temperature based lifted index for the Indian monsoon region. Decreasing values of RLI tend to give increasing rainfall probabilities.

Keywords

Radio occultation; lifted index; atmospheric stability; rainfall nowcasting. 

Copyright information

© Indian Academy of Sciences 2011

Authors and Affiliations

  • D Jagadheesha
    • 1
  • B Manikiam
    • 2
  • Neerja Sharma
    • 3
  • P K Pal
    • 4
  1. 1.Atmospheric Science ProgrammeIndian Space Research Organization (ISRO) Head QuartersBangaloreIndia
  2. 2.Department of PhysicsTumkur UniversityTumkurIndia
  3. 3.Atmospheric Sciences and Oceanography GroupNational Remote Sensing CentreBalanagarIndia
  4. 4.Meteorology and Oceanography Group, Remote Sensing Applications Area, Space Applications CentreAhmedabadIndia