Abstract
Stability of the sub-cloud layer has been studied by examining the difference between the temperature of the lifting condensation level (LCL) and that of a meteorological sounding at the LCL. The difference in these temperatures was used as an indicator of the stability of the sub-cloud layer. When the temperature at LCL was warmer/cooler than its surroundings, it indicated the unstable/ adiabatic/stable conditions of the sub-cloud layer. It was observed that when conditions were unstable or adiabatic, there was less monsoon activity. Stable conditions were associated with active monsoon periods. The results are discussed with the enhancement/decrease of convective activity on days of weak/active monsoon conditions.
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References
Betts, A. K.: 1976, ‘The Thermodynamic Transformation of the Tropical Sub-Cloud Layer by Precipitation and Downdrafts’, J. Atmos. Sc. 33, 1008–1020.
Brummer, B.: 1978, ‘Mass and Energy of a 1 km High Atmospheric Box over the GATE C-Scale Triangle during Undisturbed Weather Conditions’, J. Atmos. Sci. 6, 997–1011.
Dugan, F. J.: 1973, ‘The Thermodynamic Structure of the Cumulus Sub-Cloud Layer’, Atmospheric Science Paper No. 205, Colorado State University, Colorado.
Echternacht, K. L. and Garstang, M.: 1976, ‘Change in the Structure of the Tropical Sub-Cloud Layer from Undisturbed to Disturbed States’, Mon. Wea. Rev. 104, 407–417.
Esbensen, S. K.: 1977, ‘Thermodynamic Effects of Clouds in the Trade-Wind Planetary Boundary Layer’, Ph.D. dissertation, University of California, Los Angeles, 90024.
Garstang, M. and Betts, A. K.: 1974, ‘A Review of the Tropical Boundary Layer and Cumulus Convection: Structure, Parameterisation and Modelling’, Bull. Amer. Meteorol. Soc. 55, 1195–1205.
Johnson, R. H.: 1981, ‘Large Effects of Deep Convection on the GATE Tropical Boundary Layer’, J. Atmos. Sci. 38, 2399–2411.
Parasnis, S. S., Selvam, A. M., and Ramana Murty, Bh. V.: 1985, ‘Variations of the Thermodynamical Parameters in the Atmospheric Boundary Layer over the Deccan Plateau Region, India’, Pure Appl. Geophys. 123, 305–313.
Seguin, W. R. and Garstang, M.: 1976, ‘Some Evidence of the Effects of Convection on the Tropical Sub-Cloud Layer’, J. Atmos. Sci. 33, 660–666.
Srinivasan, V., Raman, S., and Sadashivan, V.: 1975, ‘Some Aspects of the Thermodynamic Structure of Monsoon Depression’, Indian J. Meteorol. Hydrol. Geophys. 26, 487–491.
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Parasnis, S.S. Stability of the sub-cloud layer during the summer monsoon. Boundary-Layer Meteorol 52, 69–74 (1990). https://doi.org/10.1007/BF00123178
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DOI: https://doi.org/10.1007/BF00123178