Customize POP output

POP output is controlled by POP’s tavg_nml namelist, which variables such as

• tavg_freq: frequency at which the model fields are written

• tavg_freq_opt: units of time for ‘tavg_freq’ (‘nmonth’, ‘nhour’, ‘once’,…)

• tavg_file_freq:frequency at which the model files are written

• tavg_file_freq_opt: units of time for ‘tavg_file_freq’ (‘nmonth’, ‘nhour’, …)

These are arrays, with a value for each output stream. A convenient way to change the first stream to be daily averages bundled into monthly files is to add the following lines to user_nl_pop:

tavg_freq_opt(1) = 'nday' 
tavg_freq(1) = 1 
tavg_file_freq_opt(1) = 'nmonth' 
tavg_file_freq(1) = 1 

See: https://www.cesm.ucar.edu/models/cesm2/settings/current/pop2_nml.html

CAUTION: Note that changing tavg_nml variables via user_nl_pop is non-standard. While the above is convenient, attempting more complicated changes can lead to unexpected model behavior. For full flexibility, use the workaround explained in user_nl_pop.