# \#openifs-43r3 **URL:** https://forum.ecmwf.int/tag/openifs-43r3/121.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [Skin-temp vs SST vs soil temp](https://forum.ecmwf.int/t/skin-temp-vs-sst-vs-soil-temp/12123)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [23 January 2026 09:57 UTC](https://forum.ecmwf.int/t/skin-temp-vs-sst-vs-soil-temp/12123 "2026-01-23T09:57:42Z")
Good morning I've been running some OpenIFS experiments at Tco95 L91. As usual OpenIFS reads soil temp at level 1 (STL1), sea ice fraction (CI) etc from the ICMCL file. My question is: Should the soil temp at level 1 (… --- ## [SST over land, possible bug in SURF?](https://forum.ecmwf.int/t/sst-over-land-possible-bug-in-surf/12128)
**Author:** [@Klaus\_Wyser](https://forum.ecmwf.int/u/Klaus_Wyser)\ **Replies:** 11\ **Last updated:** [12 November 2024 10:11 UTC](https://forum.ecmwf.int/t/sst-over-land-possible-bug-in-surf/12128 "2024-11-12T10:11:18Z")
Admittedly SST over land sounds pretty weird, so why bother? The initial conditions for OpenIFS contain SSTK in the ICMGG\*INIT file with reasonable values over the ocean. Over land the values are close to 273 (K) bot not… --- ## [Relaxation coefficients & smoothing](https://forum.ecmwf.int/t/relaxation-coefficients-smoothing/12199)
**Author:** [@Marcus\_Koehler](https://forum.ecmwf.int/u/Marcus_Koehler)\ **Replies:** 10\ **Last updated:** [7 March 2024 15:06 UTC](https://forum.ecmwf.int/t/relaxation-coefficients-smoothing/12199 "2024-03-07T15:06:10Z")
I'm running relaxation experiments in 43r3 following the namelist changes outlined at How to use OpenIFS in nudged configuration, and I'm trying to work out what the relaxation coefficients and smoothing parameters mean … --- ## [Difference between 10 year aquaplanet simulations](https://forum.ecmwf.int/t/difference-between-10-year-aquaplanet-simulations/12099)
**Author:** [@Thomas\_Batelaan](https://forum.ecmwf.int/u/Thomas_Batelaan)\ **Replies:** 2\ **Last updated:** [12 July 2023 06:26 UTC](https://forum.ecmwf.int/t/difference-between-10-year-aquaplanet-simulations/12099 "2023-07-12T06:26:15Z")
I have a question about a notable discrepancy observed in two 10-year aquaplanet simulations. The initialization files (ICMGG\INUA, ICMGG\INIT, ICMSH\INIT) and fort.4 used were the same. The only diffe… --- ## [Perturbing the initial state for ensemble runs](https://forum.ecmwf.int/t/perturbing-the-initial-state-for-ensemble-runs/12110)
**Author:** [@Abhishek\_Savita](https://forum.ecmwf.int/u/Abhishek_Savita)\ **Replies:** 3\ **Last updated:** [10 May 2023 09:11 UTC](https://forum.ecmwf.int/t/perturbing-the-initial-state-for-ensemble-runs/12110 "2023-05-10T09:11:08Z")
perturb: 1 ensemble\_id: 1 What will happen if somebody use perturb = 2 or 3 instead of 1? any suggestion much appreciated --- ## [How are fields sent from radintg.F90 to radiation\_scheme.F90?](https://forum.ecmwf.int/t/how-are-fields-sent-from-radintg-f90-to-radiation-scheme-f90/12174)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 1\ **Last updated:** [1 May 2023 08:28 UTC](https://forum.ecmwf.int/t/how-are-fields-sent-from-radintg-f90-to-radiation-scheme-f90/12174 "2023-05-01T08:28:14Z")
Good afternoon I'm working on putting in the MACv2-SP aerosol properties in OpenIFS. This requires computing aerosol optical depth in a separate routine and sending to the radiation scheme, ecRAD. I'm reading in data… --- ## [Output CO2 or aerosol concentrations & optical depth](https://forum.ecmwf.int/t/output-co2-or-aerosol-concentrations-optical-depth/12176)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 1\ **Last updated:** [30 March 2023 17:09 UTC](https://forum.ecmwf.int/t/output-co2-or-aerosol-concentrations-optical-depth/12176 "2023-03-30T17:09:06Z")
Good afternoon I'm using OpenIFS 43r3v2 and I'd like to be able to output concentrations of greenhouse gases and aerosols. It would also be great to output aerosol optical depth for a few spectral bands. I went into yo… --- ## [Error reading the CL file for a 42 year OpenIFS run](https://forum.ecmwf.int/t/error-reading-the-cl-file-for-a-42-year-openifs-run/12146)
**Author:** [@Daniel\_Koehler](https://forum.ecmwf.int/u/Daniel_Koehler)\ **Replies:** 0\ **Last updated:** [17 February 2023 11:30 UTC](https://forum.ecmwf.int/t/error-reading-the-cl-file-for-a-42-year-openifs-run/12146 "2023-02-17T11:30:13Z")
I am running OpenIFS Cy43r3v2 at Tl255L91 with a 30 minute time step. I have an initial and boundary conditions file with starts on the 1.01.2000 and spans 42 years. When running OpenIFS the checking of the CL file fail… --- ## [OpenIFS: Editing ICMCLhif1INIT files with Eccodes tools](https://forum.ecmwf.int/t/openifs-editing-icmclhif1init-files-with-eccodes-tools/12177)
**Author:** [@Daniel\_Koehler98](https://forum.ecmwf.int/u/Daniel_Koehler98)\ **Replies:** 0\ **Last updated:** [6 February 2023 19:51 UTC](https://forum.ecmwf.int/t/openifs-editing-icmclhif1init-files-with-eccodes-tools/12177 "2023-02-06T19:51:09Z")
I am looking into editing the stl1 and ci values in the ICMCLhif1INIT files. When I split and remerge the file with eccodes like the following: grib\_copy ICMCLhif1INIT '\[shortName\]\_out' grib\_copy -B "dataDate asc" \*\_o… --- ## [Tendency fields and their explanation](https://forum.ecmwf.int/t/tendency-fields-and-their-explanation/12122)
**Author:** [@Abhishek\_Savita](https://forum.ecmwf.int/u/Abhishek_Savita)\ **Replies:** 1\ **Last updated:** [17 January 2023 11:46 UTC](https://forum.ecmwf.int/t/tendency-fields-and-their-explanation/12122 "2023-01-17T11:46:51Z")
tendency fields and their explanation --- ## [Spectral nudging / relaxation code in OpenIFS](https://forum.ecmwf.int/t/spectral-nudging-relaxation-code-in-openifs/12182)
**Author:** [@Marcus\_Koehler](https://forum.ecmwf.int/u/Marcus_Koehler)\ **Replies:** 16\ **Last updated:** [11 November 2022 10:54 UTC](https://forum.ecmwf.int/t/spectral-nudging-relaxation-code-in-openifs/12182 "2022-11-11T10:54:35Z")
From: Helge Goessling Sent: 10 March 2021 12:07 Subject: Re: Spectral nuding / relaxation code in OpenIFS Dear Markus and Glenn, I am coming back to the question of spectral nudging with OpenIFS. In the meantime … --- ## [Surface roughness on a aqua-planet simulation](https://forum.ecmwf.int/t/surface-roughness-on-a-aqua-planet-simulation/12153)
**Author:** [@Clement\_Bouvier](https://forum.ecmwf.int/u/Clement_Bouvier)\ **Replies:** 1\ **Last updated:** [20 October 2022 10:17 UTC](https://forum.ecmwf.int/t/surface-roughness-on-a-aqua-planet-simulation/12153 "2022-10-20T10:17:54Z")
Hello everyone I'm seeking to perform sensitivity experiments where the surface roughness is changed on a aqua-planet simulation (idealise case) without triggering the wave model (LWCOU or LWCOU2W). My first intuiti… --- ## [Glue restart files to change number of processors for restart](https://forum.ecmwf.int/t/glue-restart-files-to-change-number-of-processors-for-restart/12154)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 26\ **Last updated:** [7 October 2022 13:29 UTC](https://forum.ecmwf.int/t/glue-restart-files-to-change-number-of-processors-for-restart/12154 "2022-10-07T13:29:19Z")
Good evening I'm wondering if there is a tool or guide on how to "glue" and "split" the restart files (srf) so that the restart can be run on a different number of processors than the previous leg. For example, I've go… --- ## [Spectral "wiggles" in 43r3?](https://forum.ecmwf.int/t/spectral-wiggles-in-43r3/12169)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 8\ **Last updated:** [27 September 2022 13:25 UTC](https://forum.ecmwf.int/t/spectral-wiggles-in-43r3/12169 "2022-09-27T13:25:20Z")
Good afternoon all I have set up a coupled configuration with OpenIFS 43r3 + NEMO and run a first year. After using CDO to convert the grib output to netCDF I see a lot of "wiggles" in the surface pressure. I did not se… --- ## [Output data reduction to the northern hemisphere](https://forum.ecmwf.int/t/output-data-reduction-to-the-northern-hemisphere/12152)
**Author:** [@Clement\_Bouvier](https://forum.ecmwf.int/u/Clement_Bouvier)\ **Replies:** 3\ **Last updated:** [1 August 2022 13:27 UTC](https://forum.ecmwf.int/t/output-data-reduction-to-the-northern-hemisphere/12152 "2022-08-01T13:27:48Z")
Hello everyone I'm seeking to reduce the amount of data output to the northern hemisphere only. I saw that with FullPos fullpos\_usersguide.pdf (548.8 KB) it is possible to force the output to display only a specif… --- ## [Unexpected SST difference between the same OpenIFS configuration simulations with different model time steps](https://forum.ecmwf.int/t/unexpected-sst-difference-between-the-same-openifs-configuration-simulations-with-different-model-time-steps/12133)
**Author:** [@Abhishek\_Savita](https://forum.ecmwf.int/u/Abhishek_Savita)\ **Replies:** 10\ **Last updated:** [24 June 2022 10:48 UTC](https://forum.ecmwf.int/t/unexpected-sst-difference-between-the-same-openifs-configuration-simulations-with-different-model-time-steps/12133 "2022-06-24T10:48:32Z")
Dear OpenIFS experts, I am Abhishek and am very new to using the OpenIFS model, and have a question regarding the SST forcing we use to force the OPenIFS model (i.e., atmospheric components). So, I ran two simulations w… --- ## [Output of O3 concentrations used by radiation, ecRad](https://forum.ecmwf.int/t/output-of-o3-concentrations-used-by-radiation-ecrad/12166)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 0\ **Last updated:** [22 June 2022 13:02 UTC](https://forum.ecmwf.int/t/output-of-o3-concentrations-used-by-radiation-ecrad/12166 "2022-06-22T13:02:36Z")
Good afternoon all I'd like to ask about a problem that's been bugging me for a few days now: Is there a way to write the O3 concentrations used by the radiation scheme to output? Some background: By default, OpenIFS u… --- ## [Perturbing land surface parameters](https://forum.ecmwf.int/t/perturbing-land-surface-parameters/12127)
**Author:** [@Jamie\_Towner](https://forum.ecmwf.int/u/Jamie_Towner)\ **Replies:** 1\ **Last updated:** [14 June 2022 15:15 UTC](https://forum.ecmwf.int/t/perturbing-land-surface-parameters/12127 "2022-06-14T15:15:21Z")
Hello, I am planning to run some simulations using the openIFS which include perturbations to two or more parameters in the land surface module. We are currently looking to perturb the Van-Genuchten alpha parameter and… --- ## [How to creating initial file (ICMSH\* and ISMGG\*)?](https://forum.ecmwf.int/t/how-to-creating-initial-file-icmsh-and-ismgg/12193)
**Author:** [@Zhenqian\_Wang](https://forum.ecmwf.int/u/Zhenqian_Wang)\ **Replies:** 2\ **Last updated:** [9 June 2022 11:06 UTC](https://forum.ecmwf.int/t/how-to-creating-initial-file-icmsh-and-ismgg/12193 "2022-06-09T11:06:59Z")
Hi , I'm wondering whether if i can creating initial file(ICMSH${expid}INIT) from existing NetCDF files? I would like to design some sensitivity experiments, so i wont to create the initial file by NetCDF, i have tried… --- ## [OpenIFS ouput rule-of-thumb](https://forum.ecmwf.int/t/openifs-ouput-rule-of-thumb/12131)
**Author:** [@Thomas\_Batelaan](https://forum.ecmwf.int/u/Thomas_Batelaan)\ **Replies:** 3\ **Last updated:** [5 May 2022 10:23 UTC](https://forum.ecmwf.int/t/openifs-ouput-rule-of-thumb/12131 "2022-05-05T10:23:55Z")
Dear all, I am relatively new to OpenIFS and I am wondering if there is a kind of rule-of-thumb on how to output variables? I am very much aware of the How to control OpenIFS output page and know how to output on all t… --- ## [OpenIFS LBUD23 tendencies --\> out-of-mem](https://forum.ecmwf.int/t/openifs-lbud23-tendencies-out-of-mem/12175)
**Author:** [@Thomas\_Batelaan](https://forum.ecmwf.int/u/Thomas_Batelaan)\ **Replies:** 5\ **Last updated:** [2 May 2022 09:23 UTC](https://forum.ecmwf.int/t/openifs-lbud23-tendencies-out-of-mem/12175 "2022-05-02T09:23:49Z")
Hi all, I try to run a T1279 case and output PEXTRA tendencies, but I am overwriting my memory. I can run the model with regular (non-PEXTRA) grib codes, but I am struggling to output the tendencies. I share hereby the… --- ## [Aerosol effects in OpenIFS 43r3?](https://forum.ecmwf.int/t/aerosol-effects-in-openifs-43r3/12150)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 7\ **Last updated:** [8 April 2022 09:13 UTC](https://forum.ecmwf.int/t/aerosol-effects-in-openifs-43r3/12150 "2022-04-08T09:13:12Z")
Good morning I've been digging into understanding how aerosols are treated in OpenIFS 43r3v1. Some output from my NODE file is at the end of this post. My questions boil down to: 1) Is there any treatment of aerosol i… --- ## [Baroclinic wave simulation in the idealised moist case](https://forum.ecmwf.int/t/baroclinic-wave-simulation-in-the-idealised-moist-case/12103)
**Author:** [@Clement\_Bouvier](https://forum.ecmwf.int/u/Clement_Bouvier)\ **Replies:** 1\ **Last updated:** [25 March 2022 13:41 UTC](https://forum.ecmwf.int/t/baroclinic-wave-simulation-in-the-idealised-moist-case/12103 "2022-03-25T13:41:32Z")
Hello everyone, I am trying to run the baroclinic wave case in OpenIFS. The default dry case works fine. It also works fine if I change the NTESTCASE from 41 (dry) to 42 (moist). However, in both of these cases the ph… --- ## [Adding localized temperature perturbation](https://forum.ecmwf.int/t/adding-localized-temperature-perturbation/12183)
**Author:** [@Sandor\_Maho](https://forum.ecmwf.int/u/Sandor_Maho)\ **Replies:** 4\ **Last updated:** [11 March 2022 10:26 UTC](https://forum.ecmwf.int/t/adding-localized-temperature-perturbation/12183 "2022-03-11T10:26:20Z")
Hello, I am working with OpenIFS CY43R3 in its aqua planet configuration and trying to add a stationary localized heat perturbation which would mimick convective heating in the tropical mid-troposphere. My intention is… --- ## [How is runoff computed over the Antarctic ice sheet?](https://forum.ecmwf.int/t/how-is-runoff-computed-over-the-antarctic-ice-sheet/12135)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 5\ **Last updated:** [11 November 2021 10:57 UTC](https://forum.ecmwf.int/t/how-is-runoff-computed-over-the-antarctic-ice-sheet/12135 "2021-11-11T10:57:46Z")
Good afternoon, everyone! I'm running a coupled OpenIFS 43r3 + NEMO ORCA05 model with a runoff mapper similar to that of EC-Earth. The runoff mapper collects surface and sub-surface runoff from HTESSEL and eventually… --- ## [QBO and non-orographic wave drag](https://forum.ecmwf.int/t/qbo-and-non-orographic-wave-drag/12162)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 7\ **Last updated:** [8 July 2021 22:46 UTC](https://forum.ecmwf.int/t/qbo-and-non-orographic-wave-drag/12162 "2021-07-08T22:46:39Z")
Good morning all I've made some runs with Tco95L91 coupled to an NEMO (ORCA05) ocean and started investigating some of the biases. One thing that pops up is a strange behaviour of the QBO (see Figure). I reproduced Fig… --- ## [Overestimated scaling of ocean surface albedo with wind speed?](https://forum.ecmwf.int/t/overestimated-scaling-of-ocean-surface-albedo-with-wind-speed/12191)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 2\ **Last updated:** [5 July 2021 14:03 UTC](https://forum.ecmwf.int/t/overestimated-scaling-of-ocean-surface-albedo-with-wind-speed/12191 "2021-07-05T14:03:42Z")
Hello everyone, at AWI we were having yet another look at the SST biases of the coupled climate simulations made with OpenIFS 43r3 - FESOM2, but also at ECE3(IFS36r4 - NEMO3.6), and the ECMWF IFS43r1 - NEMO3.6 HighresMIP… --- ## [What is RVOLVSPEC used for?](https://forum.ecmwf.int/t/what-is-rvolvspec-used-for/12180)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 1\ **Last updated:** [2 July 2021 21:25 UTC](https://forum.ecmwf.int/t/what-is-rvolvspec-used-for/12180 "2021-07-02T21:25:17Z")
I've noticed in some namelists I'm using the value of RVOLVSPEC changes. Looking at the code this appears to be related to the volcanic aerosol optical path. Is that correct? Thanks, R. --- ## [Problem with oifs\_run on macOS: ulimit and sed command not working](https://forum.ecmwf.int/t/problem-with-oifs-run-on-macos-ulimit-and-sed-command-not-working/12118)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 2\ **Last updated:** [2 July 2021 20:31 UTC](https://forum.ecmwf.int/t/problem-with-oifs-run-on-macos-ulimit-and-sed-command-not-working/12118 "2021-07-02T20:31:15Z")
Hi, I'm trying OpenIFS on a mac (10.12.6 : Sierra). I've found a couple of problems with the oifs\_run script. The first problem is the use of 'ulimit': # Make sure process stack limit is increased ulimit -s … --- ## [Manually editing dates in rcf & waminfo](https://forum.ecmwf.int/t/manually-editing-dates-in-rcf-waminfo/12117)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [17 June 2021 13:57 UTC](https://forum.ecmwf.int/t/manually-editing-dates-in-rcf-waminfo/12117 "2021-06-17T13:57:58Z")
Over climatological runtimes OIFS 43r1v1 has stack memory and runtime growth problems. Shown is a 120 year long EC-Earth 4 simulation. The issue was reproduced with standalone OIFS. A solution targeting the root p… [Next page](https://forum.ecmwf.int/tag/openifs-43r3/121.md?match_all_tags=true&page=1&tags%5B%5D=openifs-43r3)