Atmospheric stability index using radio occultation refractivity profiles |
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| Authors: | D Jagadheesha B Manikiam Neerja Sharma P K Pal |
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| Institution: | (1) National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt;(2) Research Institute of Sustainable Humanosphere, Kyoto University, Uji, Japan;(3) Present address: Maritime Studies Department, Faculty of Marine Science, King Abdul Aziz University, Jeddah, Saudi Arabia |
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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. |
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