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What would happen if I changed the dtime in the cam's namelist without changing the ATM-NCPL

A

Aisun

syd96.asssaaword
New Member
What would happen if I changed the dtime in the cam's namelist without changing the ATM-NCPL and other values. I am using B1850 simulation
 
H

hplin

Haipeng Lin
Moderator
Staff member
Hi Aisun,

In namelist_definition.xml there is a description of the effects of dtime with respect to CAM:
The length (in seconds) of the atm time step, i.e., the driver calls the
atm component once every dtime seconds. This is also the coupling interval
between the dynamics and physics packages. This variable is not actually
used in the atm model, but rather is used by build-namelist to set the
value of {{ hilight }}atm_cpl_dt{{ closehilight }}. So it will have an effect only
when running CAM using standalone scripts. The CESM scripts have their own
method for setting {{ hilight }}atm_cpl_dt{{ closehilight }}.
Default: is resolution and dycore dependent and is set by build-namelist.
Click to expand...

From the CESM tutorial (Physics Timestep — CESM Tutorial ) it is recommended to change the model timestep by using ATM_NCPL.
 
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