Planetary Boundary Layer

The planetary boundary layer model in the Mars Global Climate Model employs a Mellor-Yamada level-2 boundary layer scheme for turbulence closure. This implementation is first described in Haberle, et al. (1993), and later updated in Haberle, et al. (1999). The model calculates surface fluxes based on heat and momentum drag coefficients from the stability functions of Savijarvi (1995) and Hourdin et al. (1995). Eddy mixing coefficients are calculated using the equations from Arya (1998). The model also mixes gaseous tracers (such as water vapor) and passes the mixing coefficients to the microphysics routines for mixing and sedimentation of dust and ice and dust particles.