initial_conditions:sea_ice []

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==== Brief description ====


Please note that Ec-Earth2 includes LIM2 and EcEarth3 can be used with both LIM2 and LIM3.

^ ID^ SEA ICE MODEL^ GRID^ FIRST^ LAST^ INTERVAL (MONTH)^ MEMBERS^ Comments^ Reference |
| DFS4.3| LIM2| ORCA1| 19581101| 20051101| 11| fc0| Initial conditions used for Ec-Earth2.3 CMIP5 decadal predictions| Brodeau et al (2006) |
| b02t| LIM2| ORCA1| 19580101| 20061231| all| fc0| Similar to DFS4.3 but run after a spinup and with a newer model version| Guemas et al (2013) |
| b02s| LIM2| ORCA1| 19580101| 20061231| all| fc0-fc4| Similar to b02t but with ocean nudging toward the 5-member ORAS4 ocean reanalysis and with wind perturbations to produce 5 members| Guemas et al (2013) |
| i00v| LIM2| ORCA1| 19790101| 20131231| all| fc0-fc4| Similar to b02s but using newer atmospheric forcings (ERAinterim)| Guemas et al (2013) |
| GLORYS2V1| LIM2| ORCA1| 19921101| 20091101| 05,11| fc0| Interpolated initial conditions from an ocean reanalysis run coupled with a sea ice model| Ferry et al (2010) |
| GLORYS2V1| LIM2| ORCA025| 19921101| 20091101| 05,11| fc0| Interpolated initial conditions from an ocean reanalysis run coupled with a sea ice model| Ferry et al (2010) |
| i03r| LIM3| ORCA1| 19580101| 20061231| all| fc0-fc4| Similar to b02t but with LIM3| no reference yet, Guemas et al (2013) can be used for the protocol |
| i03s| LIM3| ORCA1| 19790101| 20131231| all| fc0-fc4| Similar to i03r but using newer atmospheric forcings (ERAinterim)| no reference yet, Guemas et al (2013) can be used for the protocol |
| i056| LIM3| ORCA1| 19580101| 20061231| all| fc0-fc4| Similar to b02s but with LIM3, better than i03r| no reference yet, Guemas et al (2013) can be used for the protocol |
| i057| LIM3| ORCA1| 19790101| 20131231| all| fc0-fc4| Similar to i00v but with LIM3, better than i03s| no reference yet, Guemas et al (2013) can be used for the protocol |
| m017| LIM3| ORCA025| 19930501| 20091101| 05,11| fc0| Available for testing but does not include observational information| no reference |
| m063| LIM3| ORCA025| 19580101| 20061201| all| fc0| Single-category sea-ice product using DFS4.3 surface forcing fields and EC-Earth3.1 land-sea mask | no reference |
| a05y| LIM3| ORCA1| 19930101| 20091031 | all|fc0|5-category sea ice product using DFS5.2 surface forcing fields and EC-Earth3.2 land-sea mask| no reference |
| a07m| LIM3| ORCA1| 19790101| 19881231 | all|fc00-fc24|5-category sea ice product using DFS5.2 surface forcing fields, assimilation of sea ice concentration and EC-Earth3.2 land-sea mask| no reference |
| a09b| LIM3| ORCA1| 19890101| 19981231 | all|fc00-fc24|5-category sea ice product using DFS5.2 surface forcing fields, assimilation of sea ice concentration and EC-Earth3.2 land-sea mask| no reference |
| a0dc| LIM3| ORCA1| 19790101| 20150331 | all |fc01-fc25|5-category sea ice product using DFS5.2 surface forcing fields, EnKF assimilation of ESA (1992-2008) otherwise OSI-SAF sea ice concentration and EC-Earth3.2 land-sea mask| no reference |
| a0na| LIM3| ORCA1| 20150401| 20161231 | all |fc01-fc25|5-category sea ice product using DFS5.2 surface forcing fields, EnKF assimilation of ESA (1992-2008) otherwise OSI-SAF sea ice concentration and EC-Earth3.2 land-sea mask| no reference |
| a1e1/a1ue| LIM3| ORCA1| 19600101| 20151201 | all |fc00-fc04|5-category sea ice product using DFS5.2 surface forcing fields, surface restoring and subsurface nudging to ORAS4 with EC-Earth3.2 (NEMO-LIM only sims). Member fc00 should be taken from a1ue and members fc01 to fc04 should be taken from a1e1. | no reference |
| a1n1| LIM3| ORCA025| 19600101| 20151201 | all |fc04-fc00|5-category sea ice product using DFS5.2 surface forcing fields, surface restoring and subsurface nudging to ORAS5 with EC-Earth3.2 (NEMO-LIM only sims). | In progress |
| a22b| LIM3| ORCA1| 20100101| 20181201 | all |fc00-fc04|5-category sea ice product using ERA-Interim surface forcing fields, surface restoring and subsurface nudging to ORAS4 with EC-Earth3.2 (NEMO-LIM only sims). | no reference |
| a2fd| LIM3| ORCA1| 20180101| 20191201 | all |fc01-fc05|5-category sea ice product using ERA5 surface forcing fields, surface restoring and subsurface nudging to ORAS5 with EC-Earth3.2 (NEMO-LIM only sims). | no reference |

==== Need for new sea ice initial conditions ====

These are ranked by priority : 

1) ORAP5 ORCA1 and ORCA025 configuration

2) ORCA025 in-home reconstruction / reanalyses covering 1958 to present

==== References ====


Brodeau L, Barnier B, Treguier A. M., Penduff T, Gulev S, 2010, An ERA40 based atmospheric forcing for global ocean circulation models. Ocean Model, 31, 88-104.

Guemas V, Doblas-Reyes F., Mogensen K, Keeley S., Tang Y, 2013, Ensemble of sea ice initial conditions for interannual climate predictions, Clim. Dyn., doi:10.1007/s00382-014-2095-7.

Ferry N et al., 2010, Mercator global eddy permitting ocean reanalysis GLORYS1v1: description and results. Mercator Ocean Quart. Newsl, 36, 15-27.

==== How to generate new sea ice initial conditions? ====

== i00v and i057 ==

1. Fetch ERA-interim atmospheric forcing data 

Go to the cfutools GIT repository (https://earth.bsc.es/gitlab/es/cpg_tools) in the prep_nem_forcings/eraint/orca1 directory 

Follow the instructions from the README. All the scripts to fetch ERA-interim files are in that same directory

2. Prepare wind perturbations and generate members fc1-fc4 for the forcings from member fc0 

Still in the prep_nem_forcings/eraint/orca1 directory from the cfutools GIT repository. 

Instructions in the README and all scripts in that same directory

3. The atmospheric forcing files need to be stored there:

/esarchive/releases/fg/ocean/eraint

4. Fetch ORAS4 monthly temperature and salinity for the ocean nudging at ECMWF ecgate. Run in the $SCRATCH/scratchdir : 

  #!/bin/ksh
  EXPID=s4 # Tag of ORAS4 on the ECFS repository 
  DATASOURCE="ec:/emos/OCEA/4/0001/" # Root of the path where to find ORAS4 on ECFS
  YEARI=2015 # First year to download
  YEARF=2015 # Last year to download
  MEMBER_LST="0 1 2 3 4" # List of members to download
  MON_LST="01 02 03 04 05 06" # List of months to download in formate MM
  YEAR=$YEARI
  while [[ $YEAR -le $YEARF ]] ; do
  for mem in $MEMBER_LST ; do
    for mon in $MON_LST ; do
      ecp ${DATASOURCE}/opa${mem}/output/${YEAR}/0001_1m_${YEAR}${mon}01_${YEAR}${mon}*_grid_T_02.nc.gz s4_fc${mem}_${YEAR}${mon}_grid_T.nc.gz
    done
  done
  YEAR=$((YEAR+1))
  done

5. Download the ORAS4 monthly temperature and salinity locally: 

  cd /esarchive/releases/nudging/ocean/s4/ORCA1
  ftp ecaccess.ecmwf.int
  cd ECSCRATCH/scratchdir
  prompt
  mget *
  for ((jmemb=0;jmemb<=4;jmemb++)) ; do mv *fc${jmemb}*gz* fc${jmemb} ; done

6. For i057 only, interpolate + extrapolate vertically and horizontally + fill in empty seas for the ORAS4 nudging files to be usable with EC-Earth3

 Go to the cfutools GIT repository
 cd prep_restarts/example
 edit loop_outputs_oras4.sh
 change the following arguments:

 year0=2015 # First year to process
 yearf=2015 # Last year to process
 fc0=0 # First member to process
 fcf=4 # Last member to process

 Launch on stargate:
 sbatch loop_outputs_oras4.sh

7. Extend i00v and i057 

For i00v, it is necessary to copy /home/vguemas/autosubmit_i00v and used this autosubmit version. It is also
necessary to copy at ithaca /scratch/cfu/vguemas/i00v into your scratch. For i057, Autosubmit 2.4 or 2.5 can
be used. 

For both i00v and i057, the expdef needs to be modified to run only the extension of interest. If any permission
issue arises, you can ask to any IT who has root access to fix these permission issues.

The chunk length is 6 months for both i00v and i057. A change in the chunk length would induce code change in
the template relying on Omar's pluggin for ocean nudging.

==== Contacts ====

jacosta@bsc.es
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