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Offset in Solar radiation data

I'm trying to use my own meteo forcing in CLM 4.0 for an I_SP compset.The data are available for all the variables every 6 hours (3,9,15,21). I’m using a linear interpolation for all the variables except for Solar, which should be interpolated using coszen.I separated the streams for solar and the other variables, by the time variables in the two netcdf files are the same.The question is: do I have to set offset= -10800 (3 hours) for the solar data and =0 for all the others?Thanks in advance for your help, Carmelo
 
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