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IFS cycle 40r1 was the operational model at ECMWF from 19th November 2013 to 12th May 2015. These release notes describe the differences between OpenIFS 40r1v2 and 40r1v1.1.

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For differences between 40r1v1 and the previous release based on IFS cycle 38, please see the Release Notes for 40r1v1.

Warning

OpenIFS 40r1v2 will not produce the same meteorological results as the previous releases 40r1v1 and 40r1v1.1. A number of changes have been made that mean the model is not bit identical to the previous releases, though the differences are small for medium range forecasts.

For more information on the IFS 40r1 release, see the description of the IFS 40r1, more detailed summary of changes in IFS 40r1 is also available.

Support

Please report any issues or problems with this release to the OpenIFS User Forums or openifs-support@ecmwf.int.

Model documentation

The IFS 40r1 model documentation (PDF manuals) is available from the main ECMWF website.


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Summary of changes

  • an evaluation package is now included, comprising scripts and Metview macros. This uses two sets of case studies for verifying the user's OpenIFS model against OpenIFS forecasts performed at ECMWF and plot standard maps for comparison (see below).
  • reset of accumulated output. New namelist variables have been added to allow accumulated variables (e.g. total precip.) to be reset at a specified frequency. See NRSACCFREQ & NRSACCOFF in yomppc.F90 and namelist namppc.nam.h.
  • aquaplanet configuration. New variables introduced to set the min & max SST (with thanks to Jakob Beran, Stockholm)
  • bugfix in wave model code which would cause a crash when writing a restart file.
  • long-runs. A number of routines have been modified to ensure some integer variables and counters do not overflow on very long integrations (with thanks to Uwe Fladrich, SMHI and EC-Earth).
  • modified SETTLS scheme for improved stratospheric warming forecasts and various improvements for the semi-Lagrangian interpolation and mass fixers (see further notes below).
  • fix to bug in qnegat.F90 where negative values of moisture were not reset correctly, leading to a very slow moistening of the atmosphere. Negligible difference for medium range forecasts.
  • ecCodes is now supported by a change to grib_api_interface.F90. In line with this change, environment variables OIFS_GRIB_API* have been renamed to OIFS_GRIB* and OIFS_SAMPLES_PATH has been renamed OIFS_IFS_SAMPLES_PATH to avoid confusion with the default samples. As grib-api will not be supported after the end of 2018, we recommend users migrate to ecCodes.
  • sucpl0.F90 setup routine for coupled runs now added (was missing in previous version).
  • spectral_arp_mod.F90 modified to add security fix to computation of noise (has potential to alter results for ensembles).
  • bugfix to cptime.F for RS7K architecture (with thanks to Siham SBII, Morocco).
  • new command create_ex available to create the experiment directory structure for single or ensemble forecasts.
  • intel compiler options improved to prevent some crashes due to speculative execution of if branches on some hardware.
  • some I/O statistics (from iostream_mix) are now reported correctly in the model log file (NODE.001).
  • python/ecmwfapi updated to version 1.5.
  • minor efficiency improvements.
  • some surplus code removed.

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IBM compiler. Although configuration files are provided for the IBM compiler, we can not test it at ECMWF and welcome any corrections from users.

The Known Issues page has more information about potential problems with the OpenIFS code.

New evaluation package and test-data

A new evaluation package has been added to OpenIFS that allows the user to verify the meteorological performance of their model version against the same case studies run at ECMWF. This includes a new test-data download site (see below), with a step-by-step guide on how to download the initial files, ECMWF reanalyses for comparison and a gallery of the forecasts performed at ECMWF. The OpenIFS team will use these case studies with each new release to catalogue the changes in model releases. This evaluation suite will also be useful in analysing contributions from users. A more extensive evaluation suite is used at ECMWF to assess changes for the operational IFS but this is too complex to be run outside ECMWF.

For more information

See OpenIFS User Guide : Meteorological Evaluation

After introduction of the two cases, this section guides the user step by step through running the selected experiments, post-processing the model outputs, downloading the reference (ERA-Interim and ERA5) data and visualising the model outputs with Metview. A catalogue from the prepared figures is also included. The input data and the namelists needed for the model runs, the scripts for the MARS retrieves of the re-analyses, the Metview macros for visualization and the output figures are available for download on the ECMWF download server.

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