I have a nc file of 40 years for a variable recorded at daily temporal resolution. I would like to sum these over monthly intervals and have tried the following:
cdo monsum inputfile.nc outputfile.nc
Although this runs with no error, I only get one frame in the output file. I would expect a much larger file.
I am thinking this might be some issue with time in the input file.
Copied info from ncdump-h input file
:
dimensions:
time = UNLIMITED ; // (14975 currently)
longitude = 40 ;
latitude = 66 ;
variables:
double time(time) ;
time:standard_name = "time" ;
time:units = "days since 1979-1-1 00:00:00" ;
time:calendar = "proleptic_gregorian" ;
time:axis = "T" ;
double longitude(longitude) ;
longitude:standard_name = "projection_x_coordinate" ;
longitude:long_name = "longitude" ;
longitude:units = "degrees_east" ;
longitude:axis = "X" ;
double latitude(latitude) ;
latitude:standard_name = "projection_y_coordinate" ;
latitude:long_name = "latitude" ;
latitude:units = "degrees_north" ;
latitude:axis = "Y" ;
int crs ;
crs:proj4 = "+proj=longlat +datum=WGS84" ;
float variable(time, latitude, longitude) ;
variable :grid_mapping = "crs" ;
variable :_FillValue = -3.4e+38f ;
variable :missing_value = -3.4e+38f ;
variable :proj4 = "+proj=longlat +datum=WGS84" ;
variable :min = 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ;
variable :max = 6.5701843261719, 8.62581787109377, 6.24334106445315, 8.29082641601565, 7.59359130859377, 10.0182434082031, 9.76052246093752, 9.95830688476565, 10.3648010253906, 12.8482604980469, 13.1276489257813, 13.1267333984375, 10.9829345703125, 9.82497558593752, 10.1014953613281, 11.8195434570313, 13.9579711914063, 10.0517211914063, 9.37850341796877, 11.3964782714844, 13.0114074707031, 14.4672180175781, 11.4755798339844, 10.6639953613281, 11.3891540527344, 11.9616943359375, 13.7388854980469, 5.56426391601565, 7.07705078125002, 7.64479980468752, 8.25527343750002 ; // global attributes:
:CDI = "Climate Data Interface version 1.9.10 (https://mpimet.mpg.de/cdi)" ;
:Conventions = "CF-1.4" ;
:created_by = "R, packages ncdf4 and raster (version 3.4-10)" ;
:date = "2021-10-06 11:52:06" ;
:history = "Mon Oct 18 13:50:40 2021: cdo setreftime,1979-01-01,00:00:00 kdd_AR_1979_2019.nc kdd_AR_1979_2019_adj.nc\n",
Help is much appreciated. Sorry for not being to provide a straightforward reproducible example. I can share the data via we-transfer or such if needed. Thanks!
Thanks for Adrian Tompkins who lead me straight to the answer. I had to fix the time axis of the merged file used here as input. This is possible using the
settaxis operator
. Here an example of the full command:
cdo settaxis,date,time[,inc] infile outfile