Assessment of static stability indices and related thermodynamic parameters for predictions of atmospheric convective potential and precipitation over Nigeria (original) (raw)

2021

Abstract

Three static stability indices (K-index, KI; Lifted-index, LI; and Total Totals index, TTI) and three related thermodynamic parameters (First and second Adedokun indices; ADED1 and ADED2 as well as the available potential energy; CAPE) were estimated to predict instability condition and precipitation over Nigeria. ERA5 reanalysis datasets of daily air temperature and specific humidity at multiple pressure levels from 1979 to 2018 were used for the prediction while the computed seasonal averages of the static stability indices (SSIs) and thermodynamic parameters (TPs) were validated with the precipitation data. It was revealed that SSIs and TPs produced ranges of values that were fairly good predictive of atmospheric convection and instability conditions over different climatic zones. They adequately captured seasonal variations in atmospheric instability conditions and migration and pulsation of the south-westerly and the north-easterly wind systems. Significant decreasing trends in...

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