Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1776473 | Journal of Atmospheric and Solar-Terrestrial Physics | 2014 | 8 Pages |
Abstract
In the present study we made a detailed analysis of the surface ABL parameters associated with three thunderstorms that occurred over Cochin during pre-monsoon season. The high-resolution sonic anemometer data can provide microscale evolution of the surface boundary layer processes. The parameters studied are momentum flux, sensible heat flux, Turbulent Kinetic Energy (TKE), friction velocity and variance of u, v, w, T. Momentum flux anomalously increases from 0.1 N mâ2 to 1 N mâ2 during the occurrence of thunderstorm. Correspondingly, sensible heat flux decreases anomalously to a value of â200 W mâ2 from 10 W mâ2. TKE increases abruptly to 3 m2 sâ2 from 0.5 m2 sâ2 during convective activity. Friction velocity also changes abruptly to 1 m sâ1 from 0.1 m sâ1. The thermodynamic parameters and stability indices were investigated prior to the occurrence of thunderstorms and found that the atmospheric characteristics were conducive for the formation of convective activity.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geophysics
Authors
C.A. Babu, P.R. Jayakrishnan,