# Skilled (#3) - [ZDF] Vertical diffusion: removal of explicit time-stepping (#11) - Message List

[ZDF] Vertical diffusion: removal of explicit time-stepping
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I want to remove the option ln_zdfexp =.TRUE. (see namelist_ref/namzdf). This mean that the vertical diffusion on both tracers and dynamics will be always computed with a implicit (backward) unconditionally stable time-stepping scheme. The use of an explicit time-stepping (using sub-time step) will no more exist.

Is there someone using this option ? and if yes, for which purpose ?

If nobody answer within 2 weeks, this option will be suppressed in the next version of NEMO.