____________________________________________________________________________________________ Description: WACCM gravity wave breaking bug Date : 2011-08-31 Contact : Michael Mills, mmills@ucar.edu Information: Details: Gravity waves break in the middle and upper atmosphere where molecular diffusion coefficients become large. However, the gravity wave breaking scheme has been passed an eddy diffusivity for heat (kvh) instead of molecular diffusivity. Hence gravity wave breaking in the upper atmosphere is not treated correctly. In tests where this bug is fixed, very little change is seen in calculated climate or dynamics of the middle atmosphere. This bug should be fixed with the next public release of CESM.