Converting ugrd10m, vgrd10m into ws10m for ensemble grib
Added by Ran Glattstein over 2 years ago
Hi guys,
I'm working on the ECMWF ensemble gribs (can be retrieved using "wget https://ai4edataeuwest.blob.core.windows.net/ecmwf/20220830/0z/0p4-beta/oper/20220830000000-150h-oper-fc.grib2").
I'm intereted in efficiently extracting the forecasted wind speed on 2m level for each member and then averaging it.
The classic cdo commands I use are taking average on all members for the URGD10m, VGRD10m but then it means nothing and WS10m can not be calculated.
I was wondering whether there is a command to create "WS10m" for each member and then continue to normal averaging as usual.
Thank you so much,
Ran.
Replies (14)
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Karin Meier-Fleischer over 2 years ago
Hi Ran,
I am not able to download the file:
404 The specified blob does not exist
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Sorry,
Please try this one
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Karin Meier-Fleischer over 2 years ago
The problem are the ensembles within the GRIB2 file, but I think I have a solution.
cdo -f grb2 -t ecmwf -sqrt -add \
-sqr -selname,10u 20220829000000-48h-enfo-ef.grib2 \
-sqr -selname,10v 20220829000000-48h-enfo-ef.grib2 \
tmp.grb2
The wind speed variable name can be set to 10si (ECMWF).
grib_set -s shortName=10si tmp.grb2 20220829000000-48h-enfo-ef_10si.grib2
The PNG shows the computed wind speed of the first ensemble member:
| ensemble1_10si.png (256 KB) ensemble1_10si.png |
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Amazing!!!!
Thank you so much!
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
But I think we might have a problem here...
ws10m = square_root (ugrd^2 + vgrd^2)
it seems what you are doing is sum(square_root(ugrd)+square_root(vgrd))
Am I right?
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Oops,
didn't notice the sqrt at the beginning.
All is good, world is saved :))))
sorry for the mistake
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Hi again...
So I've been trying to run the commands, but sadly I'm getting an Error.
It seems like mycdo doesn't find 10u and 10v fields.
When I run
cdo -selname,10u original.grb2 dest_10u.grb2
I get the following Error:
cdo selname (Warning): Variable name 10u not found!
cdo selname (Abort): No variables selected!
I'm wondering could it be due to the fact that I'm using CDO 1.9.3 ? tried to run apt-get --upgrade but it deosn't find newer versions.
If so I willy try to install manually from downloading the tar file (if you have a script that's installing the tar it would be great).
Thanks again,
Ran.
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Karin Meier-Fleischer over 2 years ago
No, it is because the variable 10u is not in original.grb2 or you use a wrong parameter table.
You can list the variables in your file with
cdo showvar original.grb2
or get a short info about the content with
cdo sinfon original.grb2
If it is an ECMWF GRIB2 file you can use the '-t ecmwf' option
cdo -t ecmwf -selname,10u original.grb2 dest_10u.grb2
But I can only guess without the file.
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Hi, attaching the file. Sorry for that.
It seems like "cdo showvar" only identifies "2t" field, although the file contains many fields (that can be seen when running grib_ls on it)
Do you manage to perform the transformation on the attached file ? maybe my CDO version is the problem?
Thanks
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
OK I think I see the problem.
It seems like cdo showvar (or selname) can't identify the fields correctly when working on the grib that contains all of the Perturbation Members.
When running the same commands on a specific perturbation grib file (see attached) it does seem to work!
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Karin Meier-Fleischer over 2 years ago
I guess you have to update CDO because I'm not able to reproduce the problem.
cdo showvar eps_op_0p50_20220830_0000_240.US.minigrib 2t 2t 2t 2t 2t 2t 2t 2t 2t 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 2t 2t 10u 10v 2t 2t 10u 10v 2t 2t 2t 10u 10v 10u 10v tp 2t 10u 10v 2t 10u 10v 2t 10u 10v 10u 10v 2t 10u 10v 10u 10v 10u 10v 10u 10v 2t 10u 10v 2t 10u 10v 2t tp tp 10u 10v 10u 10v 2t tp 10u 10v 2t 2t 2t 2t 2t 10u 10v 2t 2t 2t 2t 2t 10u 10v 2t 2t 2t 2t 10u 10v 2t 2t 2t 2t tp 2t 2t 2t 2t 10u 10v 2t 10u 10v 2t 2t 2t 10u 10v tp 10u 10v 10u 10v 10u 10v 10u 10v tp 10u 10v tp 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v 10u 10v tp 10u 10v tp 10u 10v 2t tp 10u 10v tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp tp t gh gh t gh t gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh gh t gh gh gh gh t gh t t gh gh gh gh t t t t gh gh gh gh gh gh gh gh gh t t t t gh t t t gh t t t t t t gh t t t t t t gh t t t t gh t gh t t t t t gh gh t t t t t gh t t gh t t t t sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp sp st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st st ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro ro
Doing the calculation of the wind speed as explained above:
cdo -f grb2 -t ecmwf -sqrt -add -sqr -selname,10u eps_op_0p50_20220830_0000_240.US.minigrib -sqr -selname,10v eps_op_0p50_20220830_0000_240.US.minigrib outfile.grb2
cdo(1) add: Process started
cdo(2) sqr: Process started
cdo(3) selname: Process started
cdo(4) sqr: Process started
cdo(5) selname: Process started
cdo(1) add (Warning): Input streams have different parameter names!
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
gribapiEncode : *** GRIB2 shortName does not correspond to chosen variable name: "unknown" ("10u").
cdo(5) selname: Processed 385560 values from 459 variables over 1 timestep.
cdo(4) sqr: Processed 385560 values from 51 variables over 1 timestep.
cdo(3) selname: Processed 385560 values from 459 variables over 1 timestep.
cdo(2) sqr: Processed 385560 values from 51 variables over 1 timestep.
cdo(1) add: Processed 771120 values from 102 variables over 2 timesteps.
cdo sqrt: Processed 385560 values from 51 variables over 1 timestep [1.46s 98MB].
grib_set -s shortName=10si outfile.grb2 10si.grb2
cdo sinfon 10si.grb2
File format : GRIB2
-1 : Institut Source T Steptype Levels Num Points Num Dtype : Parameter name
1 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
2 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
3 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
4 : ECMWF unknown v instant 1 1 7560 1 P10 : 10si
5 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
6 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
7 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
8 : ECMWF unknown v instant 1 1 7560 1 P12 : 10si
9 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
10 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
11 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
12 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
13 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
14 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
15 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
16 : ECMWF unknown v instant 1 1 7560 1 P12 : 10si
17 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
18 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
19 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
20 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
21 : ECMWF unknown v instant 1 1 7560 1 P13 : 10si
22 : ECMWF unknown v instant 1 1 7560 1 P12 : 10si
23 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
24 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
25 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
26 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
27 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
28 : ECMWF unknown v instant 1 1 7560 1 P10 : 10si
29 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
30 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
31 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
32 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
33 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
34 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
35 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
36 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
37 : ECMWF unknown v instant 1 1 7560 1 P12 : 10si
38 : ECMWF unknown v instant 1 1 7560 1 P10 : 10si
39 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
40 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
41 : ECMWF unknown v instant 1 1 7560 1 P10 : 10si
42 : ECMWF unknown v instant 1 1 7560 1 P12 : 10si
43 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
44 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
45 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
46 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
47 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
48 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
49 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
50 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
51 : ECMWF unknown v instant 1 1 7560 1 P11 : 10si
Grid coordinates :
1 : lonlat : points=7560 (126x60)
lon : 233 to 295.5 by 0.5 degrees_east
lat : 22 to 51.5 by 0.5 degrees_north
Vertical coordinates :
1 : height : levels=1
height : 10 m
Time coordinate :
time : 1 step
RefTime = 2022-08-30 00:00:00 Units = hours Calendar = proleptic_gregorian
YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss
2022-09-09 00:00:00
cdo sinfon: Processed 51 variables over 1 timestep [0.26s 49MB].
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Ok, so it's probably really a version issue.
thanks
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Ran Glattstein over 2 years ago
Are versions > 1.9.3 available for ubuntu 18.04 ?
Can't find it on apt-get.
RE: Converting ugrd10m, vgrd10m into ws10m for ensemble grib - Added by Karin Meier-Fleischer over 2 years ago
I recommend to use conda to install CDO. See https://code.mpimet.mpg.de/projects/cdo/wiki/Anaconda