In the following sections, we compare our simulation results with
observations and discus how the surface stress associated with
km-size thermal convection can be considered in GCM.
The surface wind and temperature at the lowest level of our numerical
model (about 1.5 m hight) can be compared with the observation
results at the 1.6 m hight of Viking Lander 1 (VL-1) site (Hess et al., 1977).
Our numerical simulation shows that the surface stress associated with
km-size thermal convection in dust-free case reaches threshold
value required to raise dust from the surface (see section 3.c).
The transition from dust-free Mars to dusty Mars can be simulated by
GCM naturally if the contribution of km-size thermal convection to
surface stress is considered in GCM .
