Add ability to cycle GOCART aerosols #334
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Replaces the old gfs_cyc method for determining cycling frequency with one that explicitly sets the step length. In place of gfs_cyc there are two new variables to determine step sizing: STEP_GFS and STEP_DA. Both are of the timedelta type. STEP_GFS determines the frequency of GFS and defaults to 6 hours STEP_DA determines the frequency of DA and also defaults to 6 hours If STEP_GFS is set to 00:00:00, only the DA system is run If STEP_DA is set to 00:00:00, only the GFS system is run (free-forecast mode) Note that this new method currently requires the additional setting of STEP_DA to zero, in addition to using free forecast layout. If STEP_DA is non-zero, the first cycle is DA-only, so this should be kept in mind when setting up your experiments (especially if you want GFS to run at certain times of day). If both are non-zero, STEP_GFS should always be an integer multiple of STEP_DA, otherwise unexpected behavior may occur. Other than setting STEP_DA to zero for free forecast, STEP_DA is unlikely to be changed from its default value in the near-future for GFS, but the new method is flexible for any future incorporation of LAM system that requires faster DA cycling. Examples: Full-cycling with DA & GFS: STEP_GFS: !timedelta "06:00:00" STEP_DA: !timedelta "06:00:00" (since these are defaults, nothing needs to be placed in the case file, but you may wish to for clarity) Normal DA with GFS at each 00z starting 2013-04-01: SDATE: 2013-03-31t18:00:00 STEP_GFS: !timedelta "24:00:00" Free forecast with GFS every 24h at 00z starting 2013-04-01: SDATE: 2013-04-01t00:00:00 STEP_GFS: !timedelta "24:00:00" STEP_DA: !timedelta "00:00:00" CROW ss updated to add a new tool that converts a timedelta to a string. The wave model, which formerly used gfs_cyc to determine the wave cycling interval, now determines WAVHCYC directly from STEP_GFS. Since this variable is only a number of hours, this will only work for whole-hour GFS frequencies. Case files have been updated to use the new settings in place of gfs_cyc, as well as set STEP_DA to zero for free forecast cases. However, they have not all been tested. Additional testing is needed to ensure these changes are fully operational for DA cycling runs. Refs: NOAA-EMC#260, NOAA-EMC#314
Updates the restart_interval setting to make sure it always includes the STEP_GFS time if GOCART is on. This is done using the advanced functionality of restart_interval, which allows for an explicit list of restart times instead of a single interval. If STEP_GFS is a multiple of restart_interval, it is left unchanged. If STEP_GFS is not a multiple of restart_interval, restart_interval is converted to an explicit sequence of restart times, then STEP_GFS is added. If restart_interval is already an explicit list, STEP_GFS is just added to it. This may add a redundant restart time, but that is ignored by FV3. In order to complete this update, the CROW type for restart_interval had to be changed from int to string to accomodate lists of numbers. This has the added benefit of allowing explicit definition of restart times in other applications as well. As part of this update, the values for restart_interval in the forecast config were updated to use the appropriate settings rather than hardcoded values. The default value for the gfs restart_interval was also changed from 6 to 0 to maintain the previous behavior when the setting was ignored. Refs: NOAA-EMC#314
A new init_chem job is added to the coupled workflow to cycle tracer concentrations from the previous cycle's restart files. The new job doesn't run for the first cycle (since there are no previous cycle restart files to use). If aerosol initialization is desired for the first cycle, they need to be added manually, though the new scripts may be reutilized to do so. Tracer concentrations are merely copied from the restart files to the cold-start initial conditions. There is no adjustment to ensure mass conservation or any other property. The list of tracers copied is determined by the new parm/chem/gocart_tracer.list file, which is a plain-text list of NetCDF variables to copy. If any are missing in the restart files, the job will fail. The NetCDF4 module for python3 is required for the init job to work. This module is not part of the default installation of python on Hera (though it is on WCOSS), so in addition to now loading python, the base modulefile also adds the location of a personal copy of the needed python module to the PYTHONPATH. Most of the new scripts are recycled from the GEFS-aerosol development, though this method was abandoned there in favor of true warm start for the aerosol member. Refs: NOAA-EMC#314
WalterKolczynski-NOAA
requested review from
rmontuoro,
JessicaMeixner-NOAA and
KateFriedman-NOAA
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A couple things that I hope can be updated before merging:
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@rmontuoro in particular needs to confirm these changes are doing what he expected. |
This was referenced Jun 9, 2021
KateFriedman-NOAA
approved these changes
Jun 9, 2021
workflow/cases/dev/fv3q2fy19retro5-GFS@C768_ENKF@384+80MEM_whatever.yaml
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| status=$? | ||
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| # export DATAROOT="$RUNDIR/$CDATE/$CDUMP" |
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delete commented out lines?
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| # Modules availble through hpc-stack | |||
| module use /scratch2/NCEPDEV/nwprod/hpc-stack/libs/hpc-stack/modulefiles/stack | |||
| # module use /scratch2/NCEPDEV/nwprod/hpc-stack/libs/hpc-stack/modulefiles/stack | |||
| module use /scratch1/NCEPDEV/nems/Raffaele.Montuoro/dev/nasa/libs/hpc-stack/1.1.0-nasa/modulefiles/stack | |||
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What's the path forward with not relying on Raffaele's stack? What's the timeline for getting what's needed in the emc hpc stack?
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These are also only for hera, so if we are doing this, shouldn't we be consistent throughout the platforms.
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Also in the strategy used here: ufs-community/ufs-weather-model#591 only the modules that are different use the personal stack, perhaps that's a better way forward? So only:
module use -a /scratch1/NCEPDEV/nems/Raffaele.Montuoro/dev/nasa/ufs/lib/modulefiles
module load gftl-shared/v1.3.0
module load yafyaml/v0.5.1
module load mapl/v2.7.1-beta
module load intelpython/3.6.8
While all others use the hpc-stack from nwprod?
The print statement for the tracer (restart) file search was missing an f, so variables were not being substituted. Refs: NOAA-EMC#314
The restart_interval export needed to be enclosed in quotation marks so bash will properly assign the whole list to the variable. Refs: NOAA-EMC#314
FHCYC was being used to determine the forecast interval for the aerosol cycling, but this appears to be an appropriate setting to use. Added a new exported environment variable STEP_GFS, which is the number of hours between GFS forecasts. While it is derived from the workflow STEP_GFS setting, it is only the integer number of hours, not a timedelta like the workflow setting. May want to revist this later to avoid confusion. Additionally, the restart file written at the end of the forecast does not have the timestamp as part of the filename like the intermediary restart files do. The chem init script is adjusted to not use the time- stamp when looking for the final restart file. And, since it now has to read in FHMAX anyway, also added a short-circuit so the search doesn't bother trying to search previous cycles that can't include the restart time needed. Refs: NOAA-EMC#314
rmontuoro
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Jun 22, 2021
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This updates the WW3 submodule pointer to point to the top of the WW3 develop branch. The path to WW3 inputs is changed to input-data-20201201/WW3_input_data_20201207/
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* Updates to stochastic_physics_wrapper (NOAA-EMC#280) Fix to stochastic_physics_wrapper to allow for random patterns to update at a longer time-step than model Co-authored-by: Dom Heinzeller <[email protected]> * Update for Jet, bug fixes in running with frac_grid=T and GFDL MP, and in restarting with frac_grid=T (NOAA-EMC#304) Update the modulefile for jet.intel to enable UPP v10.0.0. The hpc-stack v1.0.0 pre-release is used for this. Small changes are made to tests.rt.sh for jet.intel and gaea.intel (consistency with other platforms). The submodule pointer update for fv3atm addresses bugs in the ufs-weather-model with frac_grid=T and GFDL microphysics, and with restarting the model when frac_grid=T (from @shansun6 and @SMoorthi-emc). * Feature/update mom6 and retain b4b results for 025x025 resolution (NOAA-EMC#290) * point MOM6 to new branch which corresponding to GFDL 20201022 commit * modify fms_files.cmake and mom6_files.cmake to reflect changes in MOM6 code as this version of MOM6 contains some file deletion, new files being added and renaming of files * manually set MOM6 parameters in order to retain origonal results for 0.25x0.25 resolution * update MOM6 to include Bugfix for mom6solo to be built * modify compile.sh to allow mom6solo compiling * modify MOM_input_template for all resolutions based on GFDL MOM6-example main branch update on 20201022 * change executable permissions for CMakeLists.txt * chmod 644 to 6 files Dom pointed out * chmod for CMakeLists.txt and tests/compile.sh * change baseline directpory to 20201202 in rt.sh * Update CICE, Move regression test input outside baseline directory (NOAA-EMC#270) *Updates CICE to most recent develop branch of NOAA-EMC * Sets n_aero (number of aerosols) in ice_in_template to 0. * removes trailing whitespace from ice_in * moves regression test input outside baseline directory (ufs-weather PR NOAA-EMC#312) Co-authored-by: Dusan Jovic <[email protected]> Co-authored-by: Dom Heinzeller <[email protected]> * Updates to build for JEDI linking/control, add wcoss2 (#295) * Build on wcoss2 (acorn) * Use -march=core-avx2 instead of -xCORE-AVX2 on wcoss2 * Updates to build for JEDI linking/control * Removed unnecessary include files and INLINE POST setting * Updated to address PR suggestions. * Add rt_acorn.conf. Change /lfs/h2 to /lfs/h1. * Update .gitmodules and submodule pointer for fv3atm for code review and testing * regression test results * Updated .gitmodules and removed extraneous file * Fixed .gitmodules and updated pointer for FV3 * Updated pointer to NEMS repo Co-authored-by: Dusan Jovic <[email protected]> Co-authored-by: Dom Heinzeller <[email protected]> * Final-final GFS v16 updates / restart reproducibility bugfixes (NOAA-EMC#325) * Update .gitmodules and submodule pointer for fv3atm for code review and testing * Add GFS v16 beta restart test, update stochastics test * Update regression test baseline date tag to 20201214; skip-ci * tests/rt.conf: bugfix, add missing 'fv3' to new stochy tests; skip-ci * Regression test logs for gaea.intel, hera.gnu, hera.intel, jet.intel, orion.intel; skip-ci * Run GFS v16beta tests also on wcoss; regression test logs for wcoss; skip-ci * Regression test logs for cheyenne.intel and cheyenne.gnu * Revert change to .gitmodules and update submodule pointer for fv3atm * Add optional bulk flux calculation in ufs-datm (NOAA-EMC#266) * Update NEMS DATM and CMEPS to allow the optional bulk flux formulation; add two tests using the option * Update top level CMakeList.txt to have compile flags for MOM6 and CICE6 identical for ufs-cpld and ufs-datm * Add optional configuration variable to nems.configure to specify the directory where CMEPS will write restarts * Adds cheyenne tasking variables to default_vars and sets WW3_COMP to cheyenne for platform cheyenne.intel *NOTE: Baselines develop-20201215 exist on all platforms, regression tests were run against exactly that baseline on all systems except cheyenne.intel. On cheyenne.intel the tests were run against 20201214, and this baseline is identical to 20201215 (as per "diff -r develop-20201214 develop-20201215"). Co-authors: @DusanJovic-NOAA @aerorahul @JessicaMeixner-NOAA skip-ci * Add 2 new tests for DATM-MOM6-CICE6 application (NOAA-EMC#332) * Add the following 2 tests: datm_restart_cfsr, datm_debug_cfsr * Add wcoss_dell_p3.log. * Add Hera log, Orion log, wcoss_dell_p3 log. * RRTMGP and Thompson MP coupling (NOAA-EMC#323) * Feature branch with RRTMGP and Thompson MP * Updated FV3/ccpp-physics. Added namelist and configuration for RRTMGP RTs using GSD physics. * Updated FV3 * Update physics in FV3 * Updated baselines in rt.sh * Updated RT logs. Updated FV3 physics submodule pointer. * Updated FV3 hash and .gitmodules * Regression test log for PR NOAA-EMC#323 for jet.intel (NOAA-EMC#336) * Update modules with hpc-stack v1.1.0 (NOAA-EMC#319) * Update modules with hpc-stack v1.1.0 * Minor bug fixes to CCPP UGWP Co-authored-by: Dom Heinzeller <[email protected]> * Replace old regional SDF with FV3_GFS_v15_thompson_mynn (NOAA-EMC#333) * Replace old FV3_GFS_2017_gfdlmp_regional SDF for regional tests with FV3_GFS_v15_thompson_mynn. * Final path to IC's and new results. Also, input.nml updated. * Update RegressionTests_wcoss_dell_p3.log * Update RegressionTests_wcoss_cray.log * Update RegressionTests_hera.intel.log * Update RegressionTests_jet.intel.log * Update RegressionTests_orion.intel.log * Update RegressionTests_cheyenne* logs. * Update RegressionTests_hera.gnu.log * Feature/ww3update (NOAA-EMC#334) This updates the WW3 submodule pointer to point to the top of the WW3 develop branch. The path to WW3 inputs is changed to input-data-20201201/WW3_input_data_20201207/ * Remove IPD (step 1) (NOAA-EMC#331) Make CCPP=Y the default in tests/compile.sh. Remove CCPP=Y from tests/rt*.conf and adjust formatting. Update submodule pointer for MOM6 to include PR NOAA-EMC#341 ("Update MOM6 to GFDL's 20201218 commit") Add modulefiles/wcoss_cray/fv3_debug (identical to modulefiles/wcoss_cray/fv3) Fix broken utest (see NOAA-EMC#348) * Update the format of rt.conf (NOAA-EMC#349) Update the format of MACHINES column in rt.conf (and other .conf files). This column can be either empty, which means a test will run on all supported machines, or start with - or + sign to exclude or include specified machines explicitly. * Add checkpoint restarts for ufs-cpld (NOAA-EMC#342) * Adds 3 checkpoint restart tests for the ufs-cpld model * Drops the existing c92mx025 restart test * Adds cheyenne.intel as tested configuration for ufs-cpld and ufs-datm * Fixes instances of srf_data* in various fv3_conf files * add frac grid input, update and add additional cpld tests (NOAA-EMC#354) * Updates FV3_input_frac to add both benchmark dates and L127 files * Adds additional tests and restart tests for coupled model * Sets all cpld tests to use frac grid input by default * Removes all instances of USE_LA_LI2016=True except for benchmark+wave configurations * Remove unnecessary SIMD instruction sets for Jet, first round of cleanup in rt.conf, initialize cld_amt to zero for regional runs (dycore) (NOAA-EMC#353) * Reduce SIMDMULTIARCH sets from four to two in cmake/Intel.cmake * First cleanup of regression test config tests/rt.conf * tests/rt.sh: reduce number of build jobs on jet.intel from 10 to 5 * Remove flags -f and -s from rt.sh, remove SET logic, remove corresponding column in all rt*conf files * Remove tests/rt_acorn.conf and run GFS v15p2 and GFS v16beta DEBUG tests on all platforms * Implementation of CCPP timestep_init and timestep_final phases (NOAA-EMC#337) * Update .gitmodules and submodule pointer for fv3atm for code review and testing * Update submodule pointer for fv3atm; skip-ci * Don't try to compile all suites in DEBUG mode on cheyenne.intel, weird bug on compute nodes; skip-ci * Don't try to compile all suites in DEBUG mode on wcoss_cray; skip-ci * Regression test logs for cheyenne.gnu, cheyenne.intel, gaea.intel, hera.gnu, hera.intel, jet.intel, orion.intel; skip-ci * Don't try to compile all suites in DEBUG mode on wcoss_dell_p3; skip-ci * Regression test logs for wcoss_cray and wcoss_dell_p3 * Revert change to .gitmodules and update submodule pointer for fv3atm * Update CMEPS (NOAA-EMC#345) * Update CMEPS for recent changes, including addition of new run "post" run phases to eliminate redundant mapping, multiple ice sheet capability and ocn->land ice dynamic mapping * Add a new test fv3_gfs_v16_RRTMGP_c192L127 Co-authored-by: Jun Wang <[email protected]> * Remove IPD steps 3 and 5 (NOAA-EMC#357) Reduce SIMDMULTIARCH sets from four to two in cmake/Intel.cmake * First cleanup of regression test config tests/rt.conf * tests/rt.sh: reduce number of build jobs on jet.intel from 10 to 5; skip-ci * Remove flags -f and -s from rt.sh, remove SET logic, remove corresponding column in all rt*conf files * Update usage in rt.sh, add modulefiles/jet.intel/fv3_debug; skip-ci * CCPP is default in cmake build * Add debug modulefiles for linux.gnu and macosx.gnu * Update submodule pointer for fv3atm * Change logic in CMakeLists.txt and tests/compile.sh so that 32BIT=ON automatically sets DYN32=ON; skip-ci * Move logic to set DYN32 - depending on 32BIT setting - to fv3atm * Remove -DCCPP=ON from tests/compile.sh; update submodule pointer for fv3atm; skip-ci * point fv3 to EMC develop branch (NOAA-EMC#377) * update cpl gfsv16 tests, rrtmgp fix and bug fixes in cmeps (NOAA-EMC#378) * update CMEPS, fix character length error for gnu compile * add Dusan's fix for rt_utils.sh * update cpl gfsv16 tests, replace seaice_newland.grb with global_slmask.t1534.3072.1536.grb, recover input.mom6.nml.IN, update input directory, update global thread and decomp tests, update fdiag for global control * point to Dustins rrtmgp fix branch * update input directory Co-authored-by: denise.worthen <[email protected]> Co-authored-by: Jun Wang <[email protected]> * Update develop from NOAA-GSL: RUC ice, MYNN sfclay, stochastic land perturbations (NOAA-EMC#386) * Update .gitmodules and submodule pointer for fv3atm for gsl/develop branch * RUC ice for gsl/develop (replaces NOAA-EMC#47) (NOAA-EMC#49)Implementation of RUC LSM ice model in CCPP * Squash-merge climbfuji:rucice_gfsv16dzmin into gsl/develop * Add kice=9 to tests/tests/fv3_ccpp_rap and tests/tests/fv3_ccpp_hrrr * Change NEW_BASELINE directory for gsl/develop to avoid conflicts with development work on the authoritative branches * Add KICE=9 to tests/tests/fv3_ccpp_gsd_unified_ugwp and tests/tests/fv3_ccpp_gsd_drag_suite_unified_ugwp * Revert change to .gitmodules and update submodule pointer for fv3atm * Update gsl/develop from develop 2020/12/08 (NOAA-EMC#50) * Updates to stochastic_physics_wrapper (NOAA-EMC#280) Fix to stochastic_physics_wrapper to allow for random patterns to update at a longer time-step than model * Update for Jet, bug fixes in running with frac_grid=T and GFDL MP, and in restarting with frac_grid=T (NOAA-EMC#304) Update the modulefile for jet.intel to enable UPP v10.0.0. The hpc-stack v1.0.0 pre-release is used for this. Small changes are made to tests.rt.sh for jet.intel and gaea.intel (consistency with other platforms). The submodule pointer update for fv3atm addresses bugs in the ufs-weather-model with frac_grid=T and GFDL microphysics, and with restarting the model when frac_grid=T (from @shansun6 and @SMoorthi-emc). * Land stochastic perturbations (NOAA-EMC#57) * dycore options to add zero-gradient BC to reconstruct interface u/v and change dz_min as input (NOAA-EMC#369) * Update fv3atm * update ccpp control test forecast length to 24h * remove rename command * Add CI related changes * Update RT logs * Update RT log files * Add the gaea RT log file * Update the point of fv3atm * Update fv3atm Co-authored-by: Jun Wang <[email protected]> Co-authored-by: MinsukJi-NOAA <[email protected]> Co-authored-by: Jun Wang <[email protected]> * MOM6 bugfixes, GFDL update, update CDMBGWD settings; fix for restart reproducibility (without waves) when USE_LA_LI2016=True, sign error on fprec passed to ocean, GFDL update, resolution dependent cdmbgwd settings (NOAA-EMC#379) * implements two MOM6 bugfixes in the NUOPC MOM6 cap to allow restart reproducibility when USE_LA_LI2016=True and to change the sign of the latent heat flux associated with frozen precipitation (fprec) exported to MOM6 * updates MOM6 to include the GFDL 20210120 main branch which contains EMC's wave coupling code, alone with some minor code standardization and documentation * updates the cdmbgwd namelist settings for FV3 standalone tests at C96 and implements resolution dependent values for ufs-cpld tests Co-authored-by: Ali <[email protected]> * Remove legacy gnumake build from fv3atm and NEMS, remove legacy Python 2.7 support, rename v16beta to v16 and RT updates (NOAA-EMC#384) * Update .gitmodules and submodule pointers for fv3atm and NEMS * Remove Python 2.7 support from top-level CMakeLists.txt * Reduce forecast length of test fv3_ccpp_gfs_v16_RRTMGP_c192L127 from 24h to 12h * Rename v16beta to v16 everywhere except the public release documentation * Bugfixes and missing changes * Remove 'export CCPP_LIB_DIR=ccpp/lib' from all regression tests * Update regression test baseline date tag to 20210128; skip-ci * Update ecflow-python environment on cheyenne and jet; skip-ci * Update CMEPS for HAFS integration; add datm and coupled-model tests on Gaea (NOAA-EMC#401) * Add HAFS support in NOAA-EMC/CMEPS * Add coupled and datm tests for Gaea.intel Co-authored-by: Jun Wang <[email protected]> Co-authored-by: Bin Li <[email protected]> * Move LSM vegetation lookup tables into CCPP, clean up RUC snow cover on ice initialization (remove IPD step 2) (NOAA-EMC#407) * Regression test logs for all tier=1 platforms * updates FMS to 2020.04.01 (NOAA-EMC#392) * updates FMS to 2020.04.01 * fixes fms_files.cmake * removes extra horiz_interp * Workaround for FMS 2020.04.01 for Cheyenne with GNU 9.1.0, incl. regression test log Co-authored-by: Mikyung Lee <[email protected]> Co-authored-by: Dom Heinzeller <[email protected]> * add optional mesh in MOM6; add dz_min and min_seaice as configurable variables for coupled model (NOAA-EMC#399) *Implements an optional setting in the cpld and datm nems.configure files to specify whether the MOM6 cap should use a mesh or a grid *Adds configurable settings for min_seaice to gfs_physics_nml and dz_min to fv_core_nml. * UGWP v0 v1 combined (NOAA-EMC#396) - combines the changes in PRs NOAA-EMC#360 and NOAA-EMC#382 - adds three regression tests `fv3_ccpp_gfsv16_ugwpv1 `, `fv3_ccpp_gfsv16_ugwpv1_warmstart` and `fv3_ccpp_gfsv16_ugwpv1_debug` - contains updates and bugfixes for `nc_compare.py` and the CI tests from @MinsukJi-NOAA - update Python3 environment on jet.intel, gaea.intel, cheyenne.{intel,gnu} - turn off (again) test `fv3_ccpp_decomp` on jet.intel, this test didn't work in the past, but recently it "passed", because the error checking with `nc_compare.py` failed silently and we didn't notice it Co-authored-by: valery.yudin <[email protected]> Co-authored-by: Michael Toy <[email protected]> Co-authored-by: MinsukJi-NOAA <[email protected]> * Update regression tests from GFSv15+Thompson to GFSv16+Thompson, include "Add one regional regression test in DEBUG mode. (NOAA-EMC#419)" (NOAA-EMC#421) * Add one regional regression test in DEBUG mode. * Update .gitmodules and submodule pointer for fv3atm for code review and testing * Update regression tests from GFSv15+Thompson to GFSv16+Thompson * Combine several COMPILE lines in tests/rt.conf and tests/rt_gnu.conf * Regression test log for cheyenne.{gnu,intel},gaea.intel, hera.gnu, jet.intel,hera.intel,orion.intel;wcoss_cray and wcoss_dell_p3; Co-authored-by: Phil Pegion <[email protected]> Co-authored-by: jiandewang <[email protected]> Co-authored-by: Denise Worthen <[email protected]> Co-authored-by: Dusan Jovic <[email protected]> Co-authored-by: Mark Potts <[email protected]> Co-authored-by: BinLi-NOAA <[email protected]> Co-authored-by: dustinswales <[email protected]> Co-authored-by: Kyle Gerheiser <[email protected]> Co-authored-by: RatkoVasic-NOAA <[email protected]> Co-authored-by: Ali.Abdolali <[email protected]> Co-authored-by: Jun Wang <[email protected]> Co-authored-by: Jun Wang <[email protected]> Co-authored-by: XiaqiongZhou-NOAA <[email protected]> Co-authored-by: Ali <[email protected]> Co-authored-by: Bin Li <[email protected]> Co-authored-by: MiKyung Lee <[email protected]> Co-authored-by: valery.yudin <[email protected]> Co-authored-by: Michael Toy <[email protected]> Co-authored-by: MinsukJi-NOAA <[email protected]>
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The ability to cycle GOCART aerosols for otherwise cold-start initial conditions is added to the CROW-based coupled workflow.
The following now happen automatically when GOCART coupling is on
Importantly, the aerosol fields are merely copied to the initial condition files. They are not modified for mass conservation or any other properties.
As part of this modification, the method for specifying the forecast cadence was overhauled. gfs_cyc has been eliminated in favor of an explicit specification of the step size for both the GFS and DA system via STEP_GFS and STEP_DA, respectively. This allows for steps that are longer than 24 hours (See #260). Technically, the step sizes can be any arbitrary length, but other downstream settings are only listed in hours, so fractional hours may not work properly.
Setting STEP_GFS to !timedelta "00:00:00" will turn off GFS forecasts (DA cycling-only)
Setting STEP_DA to !timedelta "00:00:00" will turn off DA (free-forecast mode)
Note that setting STEP_DA to zero is now required for free forecasts in addition to using the free forecast CROW layout.
Examples are available in the commit message for c196176.
Refs: #260
Closes: #314