What are the numbers printed in the atm.log files after nstep, te?

[JennyB]

Hi,

With CESM-2.1.3 for example, what exactly do the 4 values printed in the atm.log file at each time step correspond to (physical quantity and unit)?

If they are identical for 2 runs for the same time step, does it mean that these 2 simulations are exactly the same, or can it be mere coincidence?

Cheers,

Jenny

 

[peverley]

Hi Jenny,

Those values are printed by the check_energy module. You can find the code in question here: $CAM/src/physics/cam/check_energy.F90 (around line ~560).

write(iulog,'(1x,a9,1x,i8,4(1x,e25.17))') "nstep, te", nstep, teinp_glob, teout_glob, heat_glob, psurf_glob

The four numbers after the timestep number are:

1. teinp_glob: global mean energy of input state [J]
2. teout_glob: global mean energy of output state [J]
3. heat_glob: global mean heating rate [J s-1]
4. psurf_glob: global mean surface pressure [Pa]

More recent versions of CAM also include psurf_top (global mean top boundary pressure) [Pa].

As for what you can infer from identical values, I asked a scientist and he said that it's pretty safe to say that two runs are bit for bit when the four numbers are the same (although theoretically there can be differences).

Courtney

 

[JennyB]

Thanks a lot Courtney