30 min timestep for Jnr

30 min timestep for Jnr

All jobs are overwriting U, V, θ_vd, moisture fields, π and π_s.

Comparing

u-bl619 (Timestep for both Snr and Jnr is 20 minutes)
u-bl607 (Timestep for Snr is 20 minutes and for Jnr it is 30 minutes)

Comparing u-bl619 vs u-bl607

Increasing Jnr's timestep from 20 to 30 minutes is

A little worse for most fields.
Except W and Dη/Dt which are a lot worse.