Dear Sveta,
1. We wanted to run model for 3 month. After 1 month  calculation, the process is interupted and error is stated as "fortran error 59", file for the second month is created but no calculations are made.
It sounds like you are missing the ICBC files or the links to them.  Can you supply the 10 lines or so of your log file?  And can you also perform an ls -l in you run directory?
2. So what is the problem with two or three months calculations and Is it possible to have season model runs (for instance March-May)?
This should not be a problem...  Probably something will the ICBC files or even perhaps disk space.
3. And is it possible to save all calculations for three months in one file for instance ATM.1997..
Do you want SRF, ATM, and RAD in one file?  Or do you want 3 months of data in one file?  or Both?  In any case, the answer is yes, assuming that you do not exceed the file size maximum on your computer (2 GB if I recall correctly).  To do so, you would need to modify the output code, but for the precise details of what to modify, I need the precise details of what you would like to do.
4. When we open output files ATM and SRF in GRads, the value of total precipitation is 0. Why is it so?
We need more details to diagnose this problem.  Note that at time 0, precipitation is 0.  Perhaps you are only looking time zero in grads.  Try set t 2.

Jeremy

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