Question on reordering monthly means
Added by Holly Ayres over 5 years ago
Hello,
I am not sure if there is a way to do this or a script I could write using CDO, but hopefully someone can at least point me in the right direction.
I need to create a 14 month average from 280 years of monthly data (3480 time steps in this original file). The end result would ideally be in the form of-
A,M,J,J,A,S,O,N,D,J,F,M,A,M (14 time steps). (From averaging, the last A,M would be the same as the first A,M which simplifies the problem a little).
Doing a monthly mean (ymonmean) always gives me a January to December output, but I cannot find a way to reorder this.
How would I do an April-March output rather than a January-December output (I have tried to use seltimestep 4/3591 but this still gives me the J-D output, I have also tried timesort but could not find much on the correct usage of this)? I was thinking I could then do some kind of merge of files to add on the last two months?
Is there a way to get the desired result in a simple way that I am somehow just not thinking about?
Thank you,
Holly
Replies (2)
RE: Question on reordering monthly means - Added by Karin Meier-Fleischer over 5 years ago
Hi Holly,
a mixed time axis makes sense for you?
cdo -selmon,4/12 -ymonmean tas_day_MPI-ESM-LR_rcp45_r1i1p1_20060101-20091231.nc month_4_12.nc cdo -selmon,1/5 -ymonmean tas_day_MPI-ESM-LR_rcp45_r1i1p1_20060101-20091231.nc month_1_5.nc cdo -O cat month_4_12.nc month_1_5.nc outfile.nc
cdo sinfo outfile.nc
-1 : Date Time Level Gridsize Miss : Minimum Mean Maximum : Parameter ID
1 : 2009-04-30 12:00:00 2 18432 0 : 210.23 278.44 309.47 : -1
2 : 2009-05-31 12:00:00 2 18432 0 : 207.28 280.13 314.12 : -1
3 : 2009-06-30 12:00:00 2 18432 0 : 207.82 281.09 317.02 : -1
4 : 2009-07-31 12:00:00 2 18432 0 : 205.65 281.41 316.79 : -1
5 : 2009-08-31 12:00:00 2 18432 0 : 205.63 281.12 316.82 : -1
6 : 2009-09-30 12:00:00 2 18432 0 : 205.05 280.16 312.79 : -1
7 : 2009-10-31 12:00:00 2 18432 0 : 210.55 278.84 308.13 : -1
8 : 2009-11-30 12:00:00 2 18432 0 : 221.13 277.81 307.79 : -1
9 : 2009-12-31 12:00:00 2 18432 0 : 230.93 277.35 307.53 : -1
10 : 2009-01-31 12:00:00 2 18432 0 : 231.21 277.05 307.33 : -1
11 : 2009-02-28 12:00:00 2 18432 0 : 224.92 276.80 307.02 : -1
12 : 2009-03-31 12:00:00 2 18432 0 : 216.87 277.32 306.34 : -1
13 : 2009-04-30 12:00:00 2 18432 0 : 210.23 278.44 309.47 : -1
14 : 2009-05-31 12:00:00 2 18432 0 : 207.28 280.13 314.12 : -1
cdo info: Processed 258048 values from 1 variable over 14 timesteps [0.01s 22MB]
-Karin
RE: Question on reordering monthly means - Added by Holly Ayres over 5 years ago
Hi Karin,
This is perfect, thank you!
Holly