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Change the time steps

Dear All,I'm running the cesm1.2.1 with the ICLM45CN component and daily atmospheric data. I'm just wondering to change the time steps of the lnd model clm as 8 time per day (each 3 hour). I already tried to change the ATM_NCPL from 48 per day to 8 per day. But I got errors as Trace/BPT trap. I also added tje lnd_cpl_offset and atm_cpl_offset as 10800 in user_nl_cpl, but I got the same errors. Does any of you have an idea if it's possible to run the clm in 3 hours time step with daily climate data? If yes, where can I define the parameter and which parameter should be defined?
 Thanks in advance for your replies. Best regards
 
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