CAM not outputting values at every time step

[ckuo@lbl_gov]

Hello,I am writing out every time step in CAM and CLM to chase down something I don't understand in the code. ( http://bb.cgd.ucar.edu/user/login?destination=/lwup-passed-clm-cam-disagreement)However, every other 30 minutes of CAM returns a field of zeroes.  t=0s is non-zero, t=1800s & 3600 s are zero, and then starting at t=7200 s, zeroes are returned for every hour.Is there a reason for this?    How can I get each timestep to write out?  CLM does write out non-zero fields for every time step. Here are 2 user_nl_cam files which I tried, both the same result, and an image is attached showing maps of FLUT.  ------------------user_nl_cam #1-----------------------! Users should add all user specific namelist changes below in the form of ! namelist_var = new_namelist_value avgflag_pertape='A','I'fincl2 = 'FLUT'mfilt = 1,48nhtfrq = 0,1 ------------------user_nl_cam #2-----------------------! Users should add all user specific namelist changes below in the form of ! namelist_var = new_namelist_value avgflag_pertape='A','A'fincl2 = 'FLUT'mfilt = 1,48nhtfrq = 0,1 -----------------------Thank you!

 

[eaton]

By default the radiation calculations are done once per hour.  With a 30 minute time step every other output of radiation fields will contain zeros.  To run radiation every timestep set iradsw=1 and iradlw=1 in the namelist. 

 

[ckuo@lbl_gov]

Hello Eaton,Thank you so much for this information!   The documentation I had been referring to all seem to indicate that atm is run every 1800s, as is lnd.  ATM_NCPL=48 by default?From the CPL7 User Guide:" In addition, the driver is currently configured to couple the atmosphere, land, andsea ice models using the same coupling frequency while the ocean model can be coupledat the same or at a lower frequency. To support this feature, the driver doestemporal averaging of coupling inputs to the ocean and the driver also computesthe surface ocean albedo at the higher coupling frequency “ Is it wrong to understand that the atmosphere and land should have been running at 1800 s frequency?   Is the coupler now averaging the land information before passing to the atmosphere?Thanks,Kuo

 

[1475922792@qq_com]

Hello,Can the iradsw and iradlw be set at different values? Such as iradsw=3, iradlw=1? I have tried to set them as different numbers, but CAM5 crashed. I don't know why. Hope someone can help.Thank you.