Vertical velocities and available potential energy generated by landscape variability - Theory

It is shown that landscape variability decreases the temperature in the surface layer when, through
mesoscale flow, cool air intrudes over warm patches, lifting warm air and weakening the static stability of
the upper part of the planetary boundary layer. This mechanism generates regions of upward vertical
motion and a sizable amount of available potential energy and can make the environment of the lower
troposphere more favorable to cloud formation. This process is enhanced by light ambient wind through the
generation of trapped propagating waves, which penetrate into the midtropospheric levels, transporting
upward the thermal perturbations and weakening the static stability around the top of the boundary layer.
At moderate ambient wind speeds, the presence of surface roughness changes strengthens the wave activity,
further favoring the vertical transport of the thermal perturbations. When the intensity of the ambient wind
is larger than 5 m s1, the vertical velocities induced by the surface roughness changes prevail over those
induced by the diabatic flux changes. The analysis is performed using a linear theory in which the mesoscale
dynamics are forced by the diurnal diabatic sensible heat flux and by the surface stress. Results are shown
as a function of ambient flow intensity and of the wavelength of a sinusoidal landscape variability.