• Md.Khaleelur Rahiman
• H. Aleem Basha
• K. Thygarajan

The convection developed due to temperature and moisture stratification in the atmosphere is main cause for precipitation and can be measured with Convective available potential energy (CAPE). Convection takes place before monsoon starts and as it is measured in CAPE reaches to maximum value at a place and after monsoon ends CAPE takes minimum value. In this way we have a cycle of convection over the year. There is variation in convection from station to station. In this study we have inspected dominant frequency components in CAPE for 15 meteorological station over India by applying EMD and Lomb-Scargle periodogram (LSP) algorithm for a period of 30 years (1987-2016) using Integrated Global Radiosonde Archive (IGRA) radiosonde data. We have observed significant variation in periodicity of convective activity for different stations. We have observed regional (3-4 months), semiannual (6 months), annual (12 months), quasi-biennial (20-35 months), ENSO (40-80 months), solar cycles (100-140 months), periodicities.

CAPE, EMD, IMF, LSP

"Convective Available Potential Energy Variability over India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 12, page no.1061-1068, December-2017, Available :http://www.jetir.org/papers/JETIR1712148.pdf

"Convective Available Potential Energy Variability over India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 12, page no. pp1061-1068, December-2017, Available at : http://www.jetir.org/papers/JETIR1712148.pdf