id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc 1367,NOCS development branch for sub-timestepping of vertical advection,acc,acc,"Tests using ORCA1 and ORCA025 configurations with high vertical resolution (O(1m) top boxes) can suffer from numerical stability issues associated with vertical advection. This is especially true when boxes are thinned further by options such as fully embedded sea-ice. This branch introduces a sub-timestepping scheme for vertical advection which should allow baroclinic timesteps to be maintained at traditional values even with such options activated. The scheme applies only to the vector form for momentum (ln_dynadv_vec=.true.) and has been implemented as a variant of the TVD scheme for tracer advection. Further details will be found on: wiki:ticket/1367_NOC2_ZTS",Task,closed,low,,OCE,v3.6,,fixed,,