Introduction:

An additional suite of MTGCM simulations is provided with linkage to the NASA Ames Mars General Circulation Model (MGCM) for various dust conditions [e.g. Bougher et al. 1999]. Static dust cases are chosen which incorporate horizontally uniform and specified vertical dust distributions for integrated visible dust opacities of 0.2 (Northern Summer conditions), 0.3 and 1.0 (Southern Summer conditions). The MTGCM differences in thermal, compositional, and dynamical features are striking for globally uniform opacities of 0.3 to 1.0, common to Southern Summer conditions outside of dust storm events. However, a small opacity case (0.2) yields meager MTGCM differences from the non-dust case. These MTGCM dust simulations (Mars Northern Summer and Southern Summer) are meant to provide an example of possible dust-driven thermal/dynamical effects at thermospheric heights for comparison to actual Mars thermospheric datasets (see above).