Multiyear mean on Snow cover data
Added by Nathanael Harwood over 5 years ago
Hi - using ydaymean on the attached file returns some suspect dates and data
I downloaded Snow Cover Extent SCE data from NOAA and regridded it to ECMWF format, (time) interpolated it from weekly->daily and then made it into a spatial average for the N America region.
cdo -r -remapbil,SeaIce_Jan-June2016.nc SCE.nc SCE_2_regrid.nc cdo -b F32 inttime,1966-10-10,00:00:00,1day SCE_2_regrid.nc SCE_2_Daily.nc cdo -fldmean -sellonlatbox,-130,-70,40,70 SCE_2_Daily.nc SCE_NAmerica.nc
The result, attached, looks fine to me and yet ydaymean fails to run on it from the following code:
cdo -select,season=DJF,startdate=1981-12-01,enddate=2018-02-28 SCE_NAmerica.nc temp.nc cdo -timselmean,5 temp.nc temp_5day.nc cdo -ydaymean temp_5day.nc temp1.nc cdo -mergetime -selmon,12 temp1.nc -selmon,1,2 temp1.nc SCE_NAmerica_multiyear.nc
Did the interpolation mess with the date and somehow prevent ydaymean from working? Perhaps I need to mess with the time format?
Many thanks in advance,
Nathanael
| SCE_NAmerica.nc (226 KB) SCE_NAmerica.nc |
Replies (1)
RE: Multiyear mean on Snow cover data - Added by Karin Meier-Fleischer over 5 years ago
Hi Nathanael,
you have forgotten to delete the 29th February.
cdo -O -select,season=DJF,startdate=1981-12-01,enddate=2018-02-28 -del29feb SCE_NAmerica.nc temp.nc cdo -O -timselmean,5 temp.nc temp_5day.nc cdo -O -ydaymean temp_5day.nc temp1.nc cdo -O -mergetime -selmon,12 temp1.nc -selmon,1,2 temp1.nc SCE_NAmerica_multiyear.nc
cdo info SCE_NAmerica_multiyear.nc
-1 : Date Time Level Gridsize Miss : Minimum Mean Maximum : Parameter ID
1 : 2017-12-03 00:00:00 0 1 0 : 0.68876 : -1
2 : 2017-12-08 00:00:00 0 1 0 : 0.71939 : -1
3 : 2017-12-13 00:00:00 0 1 0 : 0.73638 : -1
4 : 2017-12-18 00:00:00 0 1 0 : 0.74834 : -1
5 : 2017-12-23 00:00:00 0 1 0 : 0.76557 : -1
6 : 2017-12-28 00:00:00 0 1 0 : 0.77330 : -1
7 : 2018-01-02 00:00:00 0 1 0 : 0.77886 : -1
8 : 2018-01-07 00:00:00 0 1 0 : 0.78298 : -1
9 : 2018-01-12 00:00:00 0 1 0 : 0.78821 : -1
10 : 2018-01-17 00:00:00 0 1 0 : 0.79328 : -1
11 : 2018-01-22 00:00:00 0 1 0 : 0.79686 : -1
12 : 2018-01-27 00:00:00 0 1 0 : 0.79300 : -1
13 : 2018-02-01 00:00:00 0 1 0 : 0.78819 : -1
14 : 2018-02-06 00:00:00 0 1 0 : 0.78336 : -1
15 : 2018-02-11 00:00:00 0 1 0 : 0.77877 : -1
16 : 2018-02-16 00:00:00 0 1 0 : 0.77477 : -1
17 : 2018-02-21 00:00:00 0 1 0 : 0.76430 : -1
18 : 2018-02-26 00:00:00 0 1 0 : 0.75342 : -1
cdo info: Processed 18 values from 1 variable over 18 timesteps [0.01s 14MB]
-Karin