# Latest **URL:** https://forums.jcsda.org/latest.md [Latest](https://forums.jcsda.org/latest.md) · [Categories](https://forums.jcsda.org/categories.md) --- ## [Welcome to Discourse](https://forums.jcsda.org/t/welcome-to-discourse/7)
**Author:** [@system](https://forums.jcsda.org/u/system)\ **Replies:** 0\ **Last updated:** [August 6, 2020, 8:22pm UTC](https://forums.jcsda.org/t/welcome-to-discourse/7 "2020-08-06T20:22:15Z")
JCSDA software products include the Joint Effort in Data assimilation Integration (JEDI), the Sea-Ice Ocean and Coupled Assimilation (SOCA) system, and the Community Radiative Transfer Model (CRTM). These forums are int… --- ## [Supply a horizontal correlation .nc file to BUMP?](https://forums.jcsda.org/t/supply-a-horizontal-correlation-nc-file-to-bump/763)
**Author:** [@asafaie](https://forums.jcsda.org/u/asafaie)\ **Replies:** 2\ **Last updated:** [September 21, 2026, 5:53am UTC](https://forums.jcsda.org/t/supply-a-horizontal-correlation-nc-file-to-bump/763 "2026-09-21T05:53:12Z")
Hi, I’m trying to figure out how to configure my yaml files (for the Dirac unit test case, using dirac\_cov\_nicas.yaml and parameters\_bump\_cor\_nicas.yaml) so that instead of setting a constant value for the horizontal co… --- ## [FillValue questions when running SOCA observer offline](https://forums.jcsda.org/t/fillvalue-questions-when-running-soca-observer-offline/767)
**Author:** [@hhwei](https://forums.jcsda.org/u/hhwei)\ **Replies:** 0\ **Last updated:** [September 11, 2026, 3:10pm UTC](https://forums.jcsda.org/t/fillvalue-questions-when-running-soca-observer-offline/767 "2026-09-11T15:10:15Z")
Hi, I am trying to run the SOCA observer offline. I am currently using the model history file as the input model file instead of the restart file from GEFSv13. Is there anything I should be aware of when using the hist… --- ## [How can I obtain 3DVar static B files for a regional MPAS-JEDI？](https://forums.jcsda.org/t/how-can-i-obtain-3dvar-static-b-files-for-a-regional-mpas-jedi/677)
**Author:** [@CGC](https://forums.jcsda.org/u/CGC)\ **Replies:** 22\ **Last updated:** [August 21, 2026, 6:48pm UTC](https://forums.jcsda.org/t/how-can-i-obtain-3dvar-static-b-files-for-a-regional-mpas-jedi/677 "2026-08-21T18:48:51Z")
I am currently using MPAS-JEDI to perform 3DVar data assimilation for a regional forecast, but I am unable to find suitable static BE (background error covariance) files for my domain（15km， 1000km radius domain）. The tut… --- ## [JEDI and MPAS](https://forums.jcsda.org/t/jedi-and-mpas/764)
**Author:** [@JiaWANG](https://forums.jcsda.org/u/JiaWANG)\ **Replies:** 1\ **Last updated:** [August 21, 2026, 6:31pm UTC](https://forums.jcsda.org/t/jedi-and-mpas/764 "2026-08-21T18:31:24Z")
Can I ask why a JEDI version should only be interfaced a specific MPAS version? --- ## [MPAS-JEDI Envirnment setup on ASPIRE 2A](https://forums.jcsda.org/t/mpas-jedi-envirnment-setup-on-aspire-2a/766)
**Author:** [@SkyCanvas297](https://forums.jcsda.org/u/SkyCanvas297)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 5:14am UTC](https://forums.jcsda.org/t/mpas-jedi-envirnment-setup-on-aspire-2a/766 "2026-08-14T05:14:19Z")
Hi Team, I have been trying to set up an environment for mos3r3n/mpas-bundle. However, when I run source code/env-setup/gnu-aspire2a.sh It shows that a few modules were unable to load. Can anyone working on ASPIRE … --- ## [Mismatch for arguments MPI\_BCAST](https://forums.jcsda.org/t/mismatch-for-arguments-mpi-bcast/745)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 2\ **Last updated:** [June 9, 2026, 11:05am UTC](https://forums.jcsda.org/t/mismatch-for-arguments-mpi-bcast/745 "2026-06-09T11:05:18Z")
Hi, I am using the mpi module to manage the call of the subroutines of my new observation operator in the differents ranks. I am trying to avoid a multiple reading of a file from all the ranks(I checked that the run cra… --- ## [Differences in code governing the visible computations--v3 vs v2](https://forums.jcsda.org/t/differences-in-code-governing-the-visible-computations-v3-vs-v2/744)
**Author:** [@JackD](https://forums.jcsda.org/u/JackD)\ **Replies:** 0\ **Last updated:** [May 22, 2026, 5:23pm UTC](https://forums.jcsda.org/t/differences-in-code-governing-the-visible-computations-v3-vs-v2/744 "2026-05-22T17:23:28Z")
Were there upgrades to the CRTM regarding the processing of the visible channels from v2 to v3? I didn’t see anything specific in the Users’ Guide but we are seeing differences in the surface reflections of our simulati… --- ## [Helpcrtm\_coeffs2.4](https://forums.jcsda.org/t/helpcrtm-coeffs2-4/682)
**Author:** [@fzr111](https://forums.jcsda.org/u/fzr111)\ **Replies:** 2\ **Last updated:** [May 12, 2026, 10:16am UTC](https://forums.jcsda.org/t/helpcrtm-coeffs2-4/682 "2026-05-12T10:16:55Z")
Is the crtm\_coeffs2.3 coefficient file compatible with the crtm\_coeffs2.4 version in my WRFDA 4.5.1? If not, could you provide the latest crtm\_coeffs file suitable for Himawari-9? thanks --- ## [MPAS-JEDI Radar Reflectivity Algorithm Error](https://forums.jcsda.org/t/mpas-jedi-radar-reflectivity-algorithm-error/740)
**Author:** [@amercer](https://forums.jcsda.org/u/amercer)\ **Replies:** 1\ **Last updated:** [April 30, 2026, 10:13pm UTC](https://forums.jcsda.org/t/mpas-jedi-radar-reflectivity-algorithm-error/740 "2026-04-30T22:13:11Z")
I am trying to utilize MPAS-JEDI’s 3dVAR application to assimilate Nexrad Level II radar reflectivity. I wrote a script to convert Level II data to IODA format, which seemed to assimilate when I did it with velocity, bu… --- ## [JEDI-MPAS Error with Thompson Tables](https://forums.jcsda.org/t/jedi-mpas-error-with-thompson-tables/738)
**Author:** [@amercer](https://forums.jcsda.org/u/amercer)\ **Replies:** 4\ **Last updated:** [April 17, 2026, 7:29pm UTC](https://forums.jcsda.org/t/jedi-mpas-error-with-thompson-tables/738 "2026-04-17T19:29:53Z")
I am new to MPAS-JEDI and am trying to assimilate Nexrad Level II data to a single time in an existing MPAS regional simulation. I have successfully generated the appropriately formatted ioda file (I think), as well as t… --- ## [Question about the process of CRTM coefficient files](https://forums.jcsda.org/t/question-about-the-process-of-crtm-coefficient-files/736)
**Author:** [@chaochao](https://forums.jcsda.org/u/chaochao)\ **Replies:** 0\ **Last updated:** [April 2, 2026, 7:47am UTC](https://forums.jcsda.org/t/question-about-the-process-of-crtm-coefficient-files/736 "2026-04-02T07:47:32Z")
Dear Sir/Ma’am, Hello, this is chaochao. I am currently working on the data assimilation of the FY-3F Microwave Humidity Sounder (MWHS-2). Since the CRTM coefficient files for this instrument are not publicly available,… --- ## [MPAS-JEDI build error during make on Ubuntu (undefined reference to \_gfortran\_transfer\_real\_write)](https://forums.jcsda.org/t/mpas-jedi-build-error-during-make-on-ubuntu-undefined-reference-to-gfortran-transfer-real-write/729)
**Author:** [@Astrogirlanajli](https://forums.jcsda.org/u/Astrogirlanajli)\ **Replies:** 2\ **Last updated:** [March 17, 2026, 4:21am UTC](https://forums.jcsda.org/t/mpas-jedi-build-error-during-make-on-ubuntu-undefined-reference-to-gfortran-transfer-real-write/729 "2026-03-17T04:21:07Z")
Hello everyone, I am trying to build MPAS-JEDI using the spack-stack environment on Ubuntu. The configuration step completes successfully, but the build fails during the linking stage. Environment Host OS: Windows wi… --- ## [Meaning of hofx0, hofx1, hofx2 after MPAS-JEDI bias correction](https://forums.jcsda.org/t/meaning-of-hofx0-hofx1-hofx2-after-mpas-jedi-bias-correction/735)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 0\ **Last updated:** [March 12, 2026, 7:52am UTC](https://forums.jcsda.org/t/meaning-of-hofx0-hofx1-hofx2-after-mpas-jedi-bias-correction/735 "2026-03-12T07:52:55Z")
After I ran the satellite bias correction, the output file obsout\_3denvar\_bc\_amsua\_n19.nc4contains hofx0, hofx1, hofx2in hofx, and EffectiveQC0, EffectiveQC1, EffectiveQC2in EffectiveQC. I would like to confirm my und… --- ## [Coefficients for visible channels for GOES-19](https://forums.jcsda.org/t/coefficients-for-visible-channels-for-goes-19/734)
**Author:** [@JackD](https://forums.jcsda.org/u/JackD)\ **Replies:** 0\ **Last updated:** [March 10, 2026, 3:59pm UTC](https://forums.jcsda.org/t/coefficients-for-visible-channels-for-goes-19/734 "2026-03-10T15:59:36Z")
I recently installed CRTMv3.1.2. The TauCoeff.bin and Spc.Coeff.bin files that come with the release include the infrared channels (abi\_g19.SpcCoeff.bin and abi\_g19.TauCoeff.bin) but not the visible channels. That is, … --- ## [Mpas-jedi B sample data's date](https://forums.jcsda.org/t/mpas-jedi-b-sample-datas-date/724)
**Author:** [@rqin\_624](https://forums.jcsda.org/u/rqin_624)\ **Replies:** 1\ **Last updated:** [March 6, 2026, 5:35pm UTC](https://forums.jcsda.org/t/mpas-jedi-b-sample-datas-date/724 "2026-03-06T17:35:04Z")
Hi, I have a question about the mpas-jedi B sample data’s date. in 3\_convert\_uv\_to\_psichi.bash: the commented “# f\_fcst=…” line, is a more common dir structure “init\_dir/output.valid\_date.nc“. but the actually used … --- ## [Staggered-grid variables in a JEDI model interface](https://forums.jcsda.org/t/staggered-grid-variables-in-a-jedi-model-interface/722)
**Author:** [@zsimin97](https://forums.jcsda.org/u/zsimin97)\ **Replies:** 0\ **Last updated:** [February 24, 2026, 2:23pm UTC](https://forums.jcsda.org/t/staggered-grid-variables-in-a-jedi-model-interface/722 "2026-02-24T14:23:57Z")
I would like to ask for guidance on how staggered grids should be represented within a JEDI model interface. In our model, some variables are defined on a staggered grid (e.g., different horizontal locations for U/V win… --- ## [Difference between mpas-bundle and spack-stack](https://forums.jcsda.org/t/difference-between-mpas-bundle-and-spack-stack/632)
**Author:** [@bigveech](https://forums.jcsda.org/u/bigveech)\ **Replies:** 2\ **Last updated:** [February 24, 2026, 9:09am UTC](https://forums.jcsda.org/t/difference-between-mpas-bundle-and-spack-stack/632 "2026-02-24T09:09:44Z")
Hello everyone, I’m attempting to do some data assimilation with using JEDI MPAS. I started by looking at this repo GitHub mpas-jedi which suggested that I use mpas-bundle. After attempting to build, I came across anot… --- ## [UFO Variables, need for levels quantities](https://forums.jcsda.org/t/ufo-variables-need-for-levels-quantities/721)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 0\ **Last updated:** [February 20, 2026, 8:38pm UTC](https://forums.jcsda.org/t/ufo-variables-need-for-levels-quantities/721 "2026-02-20T20:38:31Z")
Hi, I am currently trying to integrate an observation operator in JEDI and I am working on the UFO interface. I am wondering if trough the ufo variables defined in ufo\_variables\_mod.F90 I can obtain the values of some v… --- ## [Sample Marine data for SOCA 3dvar](https://forums.jcsda.org/t/sample-marine-data-for-soca-3dvar/720)
**Author:** [@abhisek](https://forums.jcsda.org/u/abhisek)\ **Replies:** 0\ **Last updated:** [February 13, 2026, 5:23pm UTC](https://forums.jcsda.org/t/sample-marine-data-for-soca-3dvar/720 "2026-02-13T17:23:37Z")
Hi all, I am new to JEDI. Would like to implement JEDI-SOCA for OM4 MOM6 configuration. I could install the Jedi-bundle using a container image and run the one 3dvar assimilation cycle on OM4 with the help of GitHub - t… --- ## [MPAS-JEDI for satellite bias correction](https://forums.jcsda.org/t/mpas-jedi-for-satellite-bias-correction/719)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 0\ **Last updated:** [February 13, 2026, 2:35am UTC](https://forums.jcsda.org/t/mpas-jedi-for-satellite-bias-correction/719 "2026-02-13T02:35:13Z")
1. Question about using MPAS-JEDI for satellite bias correction: I would like to use MPAS-JEDI for satellite bias correction, but it seems that this part is not covered in the available tutorials. Could you please provi… --- ## [SOCA tutorial - how to run the ocean observer](https://forums.jcsda.org/t/soca-tutorial-how-to-run-the-ocean-observer/718)
**Author:** [@jsouza\_psl](https://forums.jcsda.org/u/jsouza_psl)\ **Replies:** 0\ **Last updated:** [February 11, 2026, 5:53pm UTC](https://forums.jcsda.org/t/soca-tutorial-how-to-run-the-ocean-observer/718 "2026-02-11T17:53:24Z")
I want to run the ocean observer on my MOM6 results. I was looking for the tutorial to help me get this running and provide a template for the config files. However, I see that the tutorial was removed about a year ago f… --- ## [SOCA-Tutorial; problem with TOPO\_CONFIG](https://forums.jcsda.org/t/soca-tutorial-problem-with-topo-config/717)
**Author:** [@jsouza\_psl](https://forums.jcsda.org/u/jsouza_psl)\ **Replies:** 1\ **Last updated:** [February 10, 2026, 11:01pm UTC](https://forums.jcsda.org/t/soca-tutorial-problem-with-topo-config/717 "2026-02-10T23:01:24Z")
Hi there. I have a recent build of the jedi-bundle, and am now trying to run a couple of examples contained in the soca-tutorial that I cloned from: While following the instructions for both “soca\_hofx3d.x” and “soca… --- ## [JEDI MPI Issue on Derecho](https://forums.jcsda.org/t/jedi-mpi-issue-on-derecho/716)
**Author:** [@RobinArmstrong](https://forums.jcsda.org/u/RobinArmstrong)\ **Replies:** 6\ **Last updated:** [January 8, 2026, 5:36pm UTC](https://forums.jcsda.org/t/jedi-mpi-issue-on-derecho/716 "2026-01-08T17:36:52Z")
Hello, When I try to run mpasjedi\_variational.x on Derecho, I’m getting a puzzling MPI error. It always occurs just after the ==\> create geom messages start to be displayed. Here is the error. MPICH ERROR \[Rank 16\] \[jo… --- ## [MPAS-JEDI ctest failure (test\_mpasjedi\_geometry)](https://forums.jcsda.org/t/mpas-jedi-ctest-failure-test-mpasjedi-geometry/715)
**Author:** [@AKnight](https://forums.jcsda.org/u/AKnight)\ **Replies:** 1\ **Last updated:** [December 15, 2025, 9:31pm UTC](https://forums.jcsda.org/t/mpas-jedi-ctest-failure-test-mpasjedi-geometry/715 "2025-12-15T21:31:31Z")
I have made it through the entire build process, but when I go to run the ctest from the build/mpas-jedi, the three geometry tests (2:test\_mpasjedi\_geometry, 8:test\_mpasjedi\_geometry\_iterator\_2d\_2pe, 9:test\_mpasjedi\_geom… --- ## [Not found "librtm.so" to compile oops on Derecho](https://forums.jcsda.org/t/not-found-librtm-so-to-compile-oops-on-derecho/714)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 9\ **Last updated:** [December 9, 2025, 3:28pm UTC](https://forums.jcsda.org/t/not-found-librtm-so-to-compile-oops-on-derecho/714 "2025-12-09T15:28:42Z")
Hi, I am currently compiling the MPAS-JEDI bundle on Derecho and I just did many times in the past but now that I got my account and resources back after a little period of having my account deactivated I am finding a pr… --- ## [Build fv3-jedi outside of jedi-bundle](https://forums.jcsda.org/t/build-fv3-jedi-outside-of-jedi-bundle/712)
**Author:** [@rickgrubin-noaa](https://forums.jcsda.org/u/rickgrubin-noaa)\ **Replies:** 5\ **Last updated:** [December 5, 2025, 6:21pm UTC](https://forums.jcsda.org/t/build-fv3-jedi-outside-of-jedi-bundle/712 "2025-12-05T18:21:37Z")
Building fv3-jedi outside of jedi-bundle -- --------------------------------------------------------- -- Build summary -- --------------------------------------------------------- -- system : \[host\] \[Linux-5.15.0-108… --- ## [Ctest errors when compiling JEDI in a single precision mode](https://forums.jcsda.org/t/ctest-errors-when-compiling-jedi-in-a-single-precision-mode/708)
**Author:** [@JiaWANG](https://forums.jcsda.org/u/JiaWANG)\ **Replies:** 3\ **Last updated:** [November 11, 2025, 5:45pm UTC](https://forums.jcsda.org/t/ctest-errors-when-compiling-jedi-in-a-single-precision-mode/708 "2025-11-11T17:45:19Z")
On Derecho, when I compile JEDI in the default double precision mode, all tests are passed. But when I compile JEDI in a single precision model, tests are failed starting from the 3rd test “test\_mpasjedi\_state“. These … --- ## [Variables in the ensemble samples](https://forums.jcsda.org/t/variables-in-the-ensemble-samples/710)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 1\ **Last updated:** [November 11, 2025, 5:40pm UTC](https://forums.jcsda.org/t/variables-in-the-ensemble-samples/710 "2025-11-11T17:40:58Z")
When using MPAS-JEDI for ensemble variational data assimilation, what variables need to be included in the generated sample files? --- ## [Issues building CRTM 2.4.0](https://forums.jcsda.org/t/issues-building-crtm-2-4-0/705)
**Author:** [@joehellmersNOAA](https://forums.jcsda.org/u/joehellmersNOAA)\ **Replies:** 8\ **Last updated:** [October 29, 2025, 6:31pm UTC](https://forums.jcsda.org/t/issues-building-crtm-2-4-0/705 "2025-10-29T18:31:26Z")
Hello, I’m trying to build CRTM, but the configure command gives a CRTM\_Module.F90 source file not found. What I’m doing specifically which I think is following the directions exactly .. . configuration/gfortran-debug… [Next page](https://forums.jcsda.org/latest.md?page=1)