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For every 6-hour period the IFS suite will create one gridpoint and one spectral forcing file from ERA-Interim analyses at T255L60 reduced linear Gaussian horizontal grid. It is essential that the forcing files have the same horizontal grid and vertical levels as the OpenIFS experiment.
Model Code Changes
git repository The source code changes to run OpenIFS 43r3 in nudged configuration are under version control in the OpenIFS Git repository in branch feature/nudging.
To enable nudging the namelist NAMRLX will need to be included in the namelist file fort.4.
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&NAMRLX
LRLXG=true, ! Master switch to enable nudging
LRLXVO=true, ! vorticity
LRLXDI=true, ! divergence
LRLXTE=true, ! temperature
LRLXQ=true, ! specific humidity
LRLXQL=true,
LRLXQI=true,
LRLXQC=true,
LRLXLP=true,
LRLXO3=true, ! ozone
XRLXVO=0.5, ! relaxation factor
XRLXDI=0.5,
XRLXTE=0.5,
XRLXQ=0.5,
XRLXO3=0.5,
XRLXLP=0.5,
ALATRLX1=90, ! latitude domain for nudging
ALATRLX2=-90,
ALONRLX1=0, ! longitude domain for nudging
ALONRLX2=360,
AXRLX=-0.5,
AYRLX=-0.5,
AZRLX=1.0,
NRLXLMIN=1, ! top model level for nudging
NRLXLMAX=60, ! bottom model level for nudging
CLPSHRLX='../rlxml/sh/', ! relative path to spectral forcing files
CLPGGRLX='../rlxml/gg/', ! relative path to gridpoint forcing files
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