Valid values for dtlimit in the datm_in file

[sur23beeb]

Hi all,
I am doing an ocean+ice simulation forced by JRA55 atmospheric fields. The nominal ocean grid resolution is 0.1 degree. Here are some relevant details:

resolution: TL319_t13
compset: 2000_DATM%JRA_SLND_CICE_POP2_DROF%JRA_SGLC_SWAV
cesmtag: cesm2.1.4-rc.08

I have a question regarding the parameter dtlimit in the file datm_in, located in the run/ folder. Here are the values for the 10 different data-atmospheric streams:

dtlimit = 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5

While compiling the same configuration on a different machine (Xsede), here are the corresponding values from the same file:

dtlimit = 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.e30, 1.5

For some reason, the second-last value is different. I looked up the description for this parameter (link) and the value 1.e30 apparently is used to turn off "trapping" missing data or errors in the data streams. Is there a reason the parameter is taking on different values on the two machines? I guess I could just change it manually in datm_in if I wanted to, assuming other parameter settings do not hinge on this value.

Thanks.

 

[sur23beeb]

Sorry for bumping this post but does anybody know how sensitive are simulations to values of dtlimit in the datm_in file?

 

[sur23beeb]

Just wanted to provide an udpate, turns out the dtlimit values are important! Here is a related thread.