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initial_conditions:sea_ice

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 allfc05-category sea ice product using DFS5.2 surface forcing fields and EC-Earth3.2 land-sea mask no reference
a07m LIM3 ORCA1 19790101 19881231 allfc00-fc245-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 allfc00-fc245-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-fc255-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-fc255-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-fc045-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-fc005-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-fc045-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-fc055-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

initial_conditions/sea_ice.txt · Last modified: 2020/02/04 16:57 by jacosta