ABSTRACT
Due to the poor
understanding of the small-scale processes at the air-water interface, some lab
experiments are done in a water tank by infrared techniques. With the help of
ESMD method, the stochastic temperature sequences extracted from the infrared
photographs are decomposed into several empirical modes of general periodic
forms. The corresponding analyses on the modes reveal that, within certain
limits, both spatial and temporal frequencies increase along the wind speed. As
for the amplitudes, the existence of wind may result in fold increasing of
their values. In addition, when the wind speed is added from 4 m/s to 5 m/s,
both frequency and amplitude of the surface temperature decrease and it implies
an enhanced mixing and a weakened temperature gradient under the force of wind
blowing.