# AIFS, IFS and OpenIFS **URL:** https://forum.ecmwf.int/c/ifs-aifs-and-openifs/42.md?page=3 [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) **Page:** 4 --- ## [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 … --- ## [Heatwave maximum 2mT overestimate](https://forum.ecmwf.int/t/heatwave-maximum-2mt-overestimate/12372)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 4\ **Last updated:** [2 July 2021 10:39 UTC](https://forum.ecmwf.int/t/heatwave-maximum-2mt-overestimate/12372 "2021-07-02T10:39:45Z")
Hi all ! I would like to report a kind of systematic error associated with the current heat-wave in Europe. I noticed that 2m maximum temperatures during the heat-wave peak in Northern Italy have been overpredicted. Esp… --- ## [Severe Monsoon Surge in January over Singapore](https://forum.ecmwf.int/t/severe-monsoon-surge-in-january-over-singapore/12368)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 3\ **Last updated:** [1 July 2021 13:55 UTC](https://forum.ecmwf.int/t/severe-monsoon-surge-in-january-over-singapore/12368 "2021-07-01T13:55:08Z")
Would like to share on two episodes of monsoon surges over Singapore in January this year. The first monsoon surge had a highest daily total rainfall of 238.4mm and 210.6mm on 1 and 2 January. The second monsoon surge, w… --- ## [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… --- ## [Flooding in New Zeeland in May-June 2021](https://forum.ecmwf.int/t/flooding-in-new-zeeland-in-may-june-2021/12376)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 1\ **Last updated:** [2 June 2021 15:04 UTC](https://forum.ecmwf.int/t/flooding-in-new-zeeland-in-may-june-2021/12376 "2021-06-02T15:04:19Z")
In the end of May Canterbury in New Zeeland experienced extreme rainfall followed by floods. We have started on a severe event page here: 202105 - Rainfall - New Zeeland , but we would appreciate more information about t… --- ## [Extreme rainfall in Sweden May 2021](https://forum.ecmwf.int/t/extreme-rainfall-in-sweden-may-2021/12355)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 0\ **Last updated:** [27 May 2021 14:18 UTC](https://forum.ecmwf.int/t/extreme-rainfall-in-sweden-may-2021/12355 "2021-05-27T14:18:00Z")
On 26th May, parts of Sweden experience heavy rainfall and flash flooding with up to 60mm recorded locally and 45-50mm more widely across the region. This was associated with a frontal system approaching from the south, … --- ## [Tropical Cyclone Tauktae](https://forum.ecmwf.int/t/tropical-cyclone-tauktae/12363)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 0\ **Last updated:** [25 May 2021 18:02 UTC](https://forum.ecmwf.int/t/tropical-cyclone-tauktae/12363 "2021-05-25T18:02:10Z")
Tropical Cyclone Tauktae recently impacted India, making landfall in Gujarat on 17th May 2021 after passing along the wester coast of India. Floodlist reports that weather stations in Mumbair recorded 230mm of rain in th… --- ## [Fujiwhara Effect of Tropical Cyclones Seroja & Odette](https://forum.ecmwf.int/t/fujiwhara-effect-of-tropical-cyclones-seroja-odette/12359)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 0\ **Last updated:** [10 May 2021 17:59 UTC](https://forum.ecmwf.int/t/fujiwhara-effect-of-tropical-cyclones-seroja-odette/12359 "2021-05-10T17:59:55Z")
On 10th April, tropical cyclones Seroja and Odette merged together - a rare phenomenon called the Fujiwhara Effect, which presents a significant challenge in forecasting track and intensity of the tropical cyclones. Ty… --- ## [Precipitation forecast biases in Southeast Asia](https://forum.ecmwf.int/t/precipitation-forecast-biases-in-southeast-asia/12374)
**Author:** [@Rebecca\_Emerton](https://forum.ecmwf.int/u/Rebecca_Emerton)\ **Replies:** 0\ **Last updated:** [10 May 2021 17:53 UTC](https://forum.ecmwf.int/t/precipitation-forecast-biases-in-southeast-asia/12374 "2021-05-10T17:53:57Z")
ECMWF are aware of a systematic wet bias in IFS forecasts of precipitation over Southeast Asia, with an average bias of 1.61 mm/day in the boreal summer half-year, and precipitation overestimations on forecast day 3 of u… --- ## [Are vtables actually needed?](https://forum.ecmwf.int/t/are-vtables-actually-needed/12187)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [22 February 2021 12:39 UTC](https://forum.ecmwf.int/t/are-vtables-actually-needed/12187 "2021-02-22T12:39:42Z")
Hi all I always link rtables and vtables folders in my run directory when I run OpenIFS, but I just tried to run without vtables and it still works. I've dug into the code and I can't find that vtable files, e.g. vtabl… --- ## [OpenIFS run with pextra: Floating point exception](https://forum.ecmwf.int/t/openifs-run-with-pextra-floating-point-exception/12126)
**Author:** [@Julian\_Krueger](https://forum.ecmwf.int/u/Julian_Krueger)\ **Replies:** 9\ **Last updated:** [11 January 2021 13:22 UTC](https://forum.ecmwf.int/t/openifs-run-with-pextra-floating-point-exception/12126 "2021-01-11T13:22:07Z")
Hi all, I tried to run OpenIFS 43r3 with TCO95 and I'm using pextra fields for the first time. The run crashed due to a 'Floating point exception (core dumped)’. Is there any additional information necessary to know ab… --- ## [Chemical tracer transport in OpenIFS](https://forum.ecmwf.int/t/chemical-tracer-transport-in-openifs/12168)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 16\ **Last updated:** [16 December 2020 16:03 UTC](https://forum.ecmwf.int/t/chemical-tracer-transport-in-openifs/12168 "2020-12-16T16:03:06Z")
I was approached by a colleague of mine who was asking about the feasibility of calculating chemical tracer transport with OpenIFS. I did some research and found three different project in this direction. Firstly there … --- ## [Nudging to reanalysis / operational analysis](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188)
**Author:** [@Victoria\_Sinclair](https://forum.ecmwf.int/u/Victoria_Sinclair)\ **Replies:** 12\ **Last updated:** [7 December 2020 12:16 UTC](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188 "2020-12-07T12:16:50Z")
We are interested at looking at the impact of sudden stratospheric warmings on the troposphere. We are wondering if there is a nudging capacity in OpenIFS so that we could force the stratosphere to be "correct" (i.e. nu… --- ## [Smoother orography in OpenIFS](https://forum.ecmwf.int/t/smoother-orography-in-openifs/12106)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 5\ **Last updated:** [18 November 2020 14:23 UTC](https://forum.ecmwf.int/t/smoother-orography-in-openifs/12106 "2020-11-18T14:23:24Z")
Hi I'd like to do a sensitivity experiment with OpenIFS 43r3 using smoother orography. The plan is to use Tco199 but use orography at either Tco95 or coarser resolution. Since the input file "sporog" is spectral, I'… --- ## [Changing CO2 concentration in openIFS to rcp scenarions](https://forum.ecmwf.int/t/changing-co2-concentration-in-openifs-to-rcp-scenarions/12102)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 11\ **Last updated:** [17 November 2020 13:36 UTC](https://forum.ecmwf.int/t/changing-co2-concentration-in-openifs-to-rcp-scenarions/12102 "2020-11-17T13:36:34Z")
The CO2 concentration (and other GHG concentrations) in openIFS is controlled via a couple of switches. In the climate data directory, you find the files CO2CLIM and GCO2CLIM. The CO2CLIM and GCO2CLIM files however only… --- ## [Restart file generation can suffer occasional bit level changes affecting reproducibility](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 2\ **Last updated:** [17 November 2020 13:33 UTC](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156 "2020-11-17T13:33:43Z")
It's been reported within the EC-Earth consortium with their version of IFS, and confirmed with OpenIFS 40r1, that occasional random bit-flips can occur when the model writes restart files. This means that two identical … --- ## [Tracers and mass fixers?](https://forum.ecmwf.int/t/tracers-and-mass-fixers/12149)
**Author:** [@Etienne\_Tourigny](https://forum.ecmwf.int/u/Etienne_Tourigny)\ **Replies:** 1\ **Last updated:** [17 November 2020 09:12 UTC](https://forum.ecmwf.int/t/tracers-and-mass-fixers/12149 "2020-11-17T09:12:53Z")
Dear all please excuse my ignorance on this topic, but I would like to know which (if any) GHG and aerosol tracers and which mass fixers are supported in openifs43r3? I am unsure if the page How to control mass conserv… --- ## [Stochastic perturbations](https://forum.ecmwf.int/t/stochastic-perturbations/12145)
**Author:** [@Etienne\_Tourigny](https://forum.ecmwf.int/u/Etienne_Tourigny)\ **Replies:** 4\ **Last updated:** [16 November 2020 17:41 UTC](https://forum.ecmwf.int/t/stochastic-perturbations/12145 "2020-11-16T17:41:44Z")
Dear all - can someone please inform me on the available stochastic perturbation schemes available in oifs? Are the Stochastically Perturbed Parametrization Tendency scheme (SPPT, Palmer et al., 2009; Buizza et al., 199… --- ## [Sea ice thickness](https://forum.ecmwf.int/t/sea-ice-thickness/12167)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 10\ **Last updated:** [26 July 2020 15:24 UTC](https://forum.ecmwf.int/t/sea-ice-thickness/12167 "2020-07-26T15:24:35Z")
Hello together, I was recently browsing though the code looking for where the sea ice thickness in uncoupled OpenIFS is set. I found that it is read from the restart file and written to the restart file as ZTHKICE and h… --- ## [Enabling bound checks doesn't work](https://forum.ecmwf.int/t/enabling-bound-checks-doesnt-work/12186)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 4\ **Last updated:** [8 May 2020 00:15 UTC](https://forum.ecmwf.int/t/enabling-bound-checks-doesnt-work/12186 "2020-05-08T00:15:22Z")
Hi, I'm trying to debug a problem with the model. I modified the FCM config files to add the array bound checking but now I get a strange message about subscripts with values -999999 which don't look like random values … --- ## [Negative humidity fixer](https://forum.ecmwf.int/t/negative-humidity-fixer/12096)
**Author:** [@Try\_Gve](https://forum.ecmwf.int/u/Try_Gve)\ **Replies:** 1\ **Last updated:** [20 March 2020 13:20 UTC](https://forum.ecmwf.int/t/negative-humidity-fixer/12096 "2020-03-20T13:20:45Z")
Hi. We are doing a "sensitivity analysis" exercise investigating the impact on turning on and off various parametrization schemes in the OpenIFS framework. In that regards, I have played around with the Negative Humidity… --- ## [Scm with fixed solar radiation](https://forum.ecmwf.int/t/scm-with-fixed-solar-radiation/12157)
**Author:** [@Miriam\_Saraceni](https://forum.ecmwf.int/u/Miriam_Saraceni)\ **Replies:** 2\ **Last updated:** [10 February 2020 13:22 UTC](https://forum.ecmwf.int/t/scm-with-fixed-solar-radiation/12157 "2020-02-10T13:22:53Z")
Hi all, I would like to change the Single column model source code in order to run the model with constant and fixed radiation from the sun, avoiding diurnal cycle. By looking at the source code for the radiation i… --- ## [Surface conditions in AMIP runs](https://forum.ecmwf.int/t/surface-conditions-in-amip-runs/12192)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 6\ **Last updated:** [4 November 2019 03:35 UTC](https://forum.ecmwf.int/t/surface-conditions-in-amip-runs/12192 "2019-11-04T03:35:00Z")
Hi I was wondering about AMIP-style runs with OpenIFS. About a year ago, Glenn sent me a set of ICMCL files (from prepIFS I think) that I use to give OpenIFS a surface condition when running. These files include skin-t… --- ## [OCP-Tool to generate OASIS3MCT input files and modify OIFS & runoff\_mapper input files for coupled simulations](https://forum.ecmwf.int/t/ocp-tool-to-generate-oasis3mct-input-files-and-modify-oifs-runoff-mapper-input-files-for-coupled-simulations/12173)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [16 October 2019 13:40 UTC](https://forum.ecmwf.int/t/ocp-tool-to-generate-oasis3mct-input-files-and-modify-oifs-runoff-mapper-input-files-for-coupled-simulations/12173 "2019-10-16T13:40:45Z")
I'd like to share a v0.1 of something I called OpenIFS Coupling Preparation Tool (ocp-tool). I combined some of Joakims script to generate OASIS3MCT input files for a given OpenIFS grid with my script to modify OpenIFS … --- ## [EXTREMELY slow OpenIFS when coupled to NEMO using Intel MPI version 2019](https://forum.ecmwf.int/t/extremely-slow-openifs-when-coupled-to-nemo-using-intel-mpi-version-2019/12172)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 9\ **Last updated:** [5 September 2019 16:54 UTC](https://forum.ecmwf.int/t/extremely-slow-openifs-when-coupled-to-nemo-using-intel-mpi-version-2019/12172 "2019-09-05T16:54:02Z")
Hi all I've got a coupled model, FOCI-OpenIFS, which consists of OpenIFS 40R1 + NEMO 3.6 + OASIS3-MCT3 + river routing (similar to EC-Earth). I'm running it on HLRN-IV in Goettingen, Germany, which has Intel Skylake … --- ## [Crash when running OpenIFS CY40 with 4 threads per task](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [31 July 2019 13:58 UTC](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097 "2019-07-31T13:58:27Z")
Good afternoon I'm running some experiments with OpenIFS T511L91 which seems to scale up to ~ 1200 MPI tasks. Beyond that the model actually becomes slower when using more CPUs. So I thought I would try to use more th… --- ## [Processing ICMUA output files](https://forum.ecmwf.int/t/processing-icmua-output-files/12132)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 4\ **Last updated:** [30 July 2019 08:17 UTC](https://forum.ecmwf.int/t/processing-icmua-output-files/12132 "2019-07-30T08:17:26Z")
Good morning, I'm running cy43r3 and I would like to process the ICMUA output files. The new files contain a mix of grib1 and grib2 fields that is not easly processable by the cdo provided our computing center: … --- ## [How to output the streamfunction and velocity potential from OpenIFS?](https://forum.ecmwf.int/t/how-to-output-the-streamfunction-and-velocity-potential-from-openifs/12190)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 5\ **Last updated:** [26 July 2019 10:53 UTC](https://forum.ecmwf.int/t/how-to-output-the-streamfunction-and-velocity-potential-from-openifs/12190 "2019-07-26T10:53:26Z")
Hi OpenIFS team, I would like to be able to output the streamfunction and velocity potential from OpenIFS (instead of or as well as the divergence and vorticity). Unfortunately the GRIB codes for streamfn and vel.pot. … --- ## [Modifiying the land sea mask](https://forum.ecmwf.int/t/modifiying-the-land-sea-mask/12121)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 2\ **Last updated:** [23 July 2019 12:05 UTC](https://forum.ecmwf.int/t/modifiying-the-land-sea-mask/12121 "2019-07-23T12:05:52Z")
I would like to run an OpenIFS setup (T159) coupled to a low resolution ocean. The ocean model and OpenIFS do not fully agree as to which surface points should be wet points: I used Joakims skript for generating o… --- ## [Can not run OpenIFS beyond year 2154 (255 years since 1900)](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 1\ **Last updated:** [23 July 2019 11:56 UTC](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134 "2019-07-23T11:56:39Z")
Hi all I've just had a crash of my coupled OpenIFS cy40r1 +NEMO 3.6 model, the error being \[481\] grib\_accessor\_class\_budgdate.c at line 188: assertion failure Assert(year \< 255) I know Jan Streffing talked about this… [Previous page](https://forum.ecmwf.int/c/ifs-aifs-and-openifs/42.md?page=2) [Next page](https://forum.ecmwf.int/c/ifs-aifs-and-openifs/42.md?page=4)