about improper time dimension value to extract

hi,
  i met a strange problem, i have a nc file, whose information is as following with ncdump:
*********************************************
netcdf cruncep_lwdown_1901 {
dimensions:
        time_counter = UNLIMITED ; // (1460 currently)
        latitude = 360 ;
        longitude = 720 ;

variables:
        float Incoming_Long_Wave_Radiation(time_counter, latitude, longitude) ;
                Incoming_Long_Wave_Radiation:title = "Incoming_Long_Wave_Radiation" ;
                Incoming_Long_Wave_Radiation:units = "W/m2" ;
        float latitude(latitude) ;
                latitude:units = "Degrees" ;
                latitude:title = "Latitude" ;
        float longitude(longitude) ;
                longitude:units = "Degrees" ;
                longitude:title = "Longitude" ;
        long mask(latitude, longitude) ;

// global attributes:
                :file_name = "cruncep_lwdown_1901_2008.nc" ;
                :model_name = "STOMATE-SECHIBA-LPJ" ;
                :history = "Tue Jan 19 15:10:21 2010: ncks -d time_counter,0,1459 cruncep_lwdown_1901_2008.nc cruncep_lwdown_1901.nc" ;
}
*********************************************

from the above presentation, the "time" dimension is not defined with normal "time",then in NCL:
  ff=addfile("cruncep_lwdown_1901.nc","r")
i can print(ff->latitude) and print(ff->longitude), but i can't print(ff->time_counter), which showed the follows error :

******************************************
ncl 9> print(ff->time_counter)
fatal:Either file (ff) isn't defined or variable (time_counter) is not a variable in the file
fatal:Execute: Error occurred at or near line 9
******************************************

anybody can give me some advice about how to show the time dimension value ?
thanks





dyjbean

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Received on Sat Aug 4 03:05:19 2012