CDO

I have many nc file, such like 2001_01.nc 2001_02.nc...2010_11.nc 2010.12.nc, and I want to merge them into one file.However, I failed when I use the "cdo mergetime ifile1 ifile2 ofile", that because they have different time information.(Well,I think so...)

I wonder if anyone can help me to merge them. Thanks a lot!

Here are the infomation of two of the files:
2001_01.nc
dimensions:
NbLatitudes = 915 ;
NbLongitudes = 1080 ;
GridDepth = 1 ;
LatLon = 2 ;
variables:
int LatLon(LatLon) ;
LatLon:_FillValue = 2147483647 ;
LatLon:long_name = "No sense but necessary for some automatic tools" ;
LatLon:units = "count" ;
double NbLatitudes(NbLatitudes) ;
NbLatitudes:_FillValue = 1.84467440737096e+19 ;
NbLatitudes:long_name = "Latitudes" ;
NbLatitudes:units = "degrees_north" ;
double NbLongitudes(NbLongitudes) ;
NbLongitudes:_FillValue = 1.84467440737096e+19 ;
NbLongitudes:long_name = "Longitudes" ;
NbLongitudes:units = "degrees_east" ;
double LatLonMin(LatLon) ;
LatLonMin:_FillValue = 1.84467440737096e+19 ;
LatLonMin:long_name = "Latitude/Longitude of south/ouest corner" ;
LatLonMin:units = "degree" ;
double LatLonStep(LatLon) ;
LatLonStep:_FillValue = 1.84467440737096e+19 ;
LatLonStep:long_name = "latitude/longitude steps" ;
LatLonStep:units = "degree" ;
float Grid_0001(NbLongitudes, NbLatitudes) ;
Grid_0001:_FillValue = 1.844674e+19f ;
Grid_0001:long_name = "Averaged Sea Level Anomaly 2001/01" ;
Grid_0001:units = "cm" ;

// global attributes:
:FileType = "GRID_DOTS_MERCATOR" ;
:OriginalName = "dt_upd_global_merged_msla_h_y2001_m01.nc" ;
:title = "SSALTO/DUACS - DT MSLA - Merged Product - Homogeneous Global Processing" ;
:years = 2001s ;
:*+months = 1s ;+*
:origin = "created from daily Sea Level Anomaly maps" ;
:institution = "CLS" ;
:CreatedBy = "SSALTO/DUACS" ;

---------------------------------------------------------------------------
2001_02.ncdimensions:
NbLatitudes = 915 ;
NbLongitudes = 1080 ;
GridDepth = 1 ;
LatLon = 2 ;
variables:
int LatLon(LatLon) ;
LatLon:_FillValue = 2147483647 ;
LatLon:long_name = "No sense but necessary for some automatic tools" ;
LatLon:units = "count" ;
double NbLatitudes(NbLatitudes) ;
NbLatitudes:_FillValue = 1.84467440737096e+19 ;
NbLatitudes:long_name = "Latitudes" ;
NbLatitudes:units = "degrees_north" ;
double NbLongitudes(NbLongitudes) ;
NbLongitudes:_FillValue = 1.84467440737096e+19 ;
NbLongitudes:long_name = "Longitudes" ;
NbLongitudes:units = "degrees_east" ;
double LatLonMin(LatLon) ;
LatLonMin:_FillValue = 1.84467440737096e+19 ;
LatLonMin:long_name = "Latitude/Longitude of south/ouest corner" ;
LatLonMin:units = "degree" ;
double LatLonStep(LatLon) ;
LatLonStep:_FillValue = 1.84467440737096e+19 ;
LatLonStep:long_name = "latitude/longitude steps" ;
LatLonStep:units = "degree" ;
float Grid_0001(NbLongitudes, NbLatitudes) ;
Grid_0001:_FillValue = 1.844674e+19f ;
Grid_0001:long_name = "Averaged Sea Level Anomaly 2001/02" ;
Grid_0001:units = "cm" ;

// global attributes:
:FileType = "GRID_DOTS_MERCATOR" ;
:OriginalName = "dt_upd_global_merged_msla_h_y2001_m02.nc" ;
:title = "SSALTO/DUACS - DT MSLA - Merged Product - Homogeneous Global Processing" ;
:years = 2001s ;
:+*months = 2s ;*+
:origin = "created from daily Sea Level Anomaly maps" ;
:institution = "CLS" ;
:CreatedBy = "SSALTO/DUACS" ;
}