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Code Block
titleDefault settings in the NAMRLX namelist
    &NAMRLX
      LRLXG=true,    ! Master switch to enable nudging

      LRLXVO=true,   ! vorticity
      LRLXDI=true,   ! divergence
      LRLXTE=true,   ! temperature
      LRLXQ=true,    ! specific humidity
      LRLXQL=true,   ! liquid water
      LRLXQI=true,   ! ice water
      LRLXQC=true,   ! cloud fraction
      LRLXLP=true,   ! log surf pressure
      LRLXO3=true,   ! ozone

      NFRLXG=2,      ! number of analysis time steps in memory
      NFRLXU=6,      ! interval between two references fields (in hours) - this is equal to NFRHIS in nudging

      NRLXLMIN=1,    ! top model level for nudging
      NRLXLMAX=60,   ! bottom model level for nudging
      NRLXLMINU=-1,  ! uppermost model level for velocity variables (-1 sets to NRLXLMIN)
      NRLXLMAXU=-1,  ! lowermost model level for velocity variables (-1 sets to NRLXLMAX)

      XRLXVO=0.5,    ! relaxation coefficients
      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,    ! smoothing parameter for lon, lat and in the vertical
      AYRLX=-0.5,
      AZRLX=1.0,

      CLPSHRLX='../rlxml/sh/',  ! relative path to spectral forcing files
      CLPGGRLX='../rlxml/gg/',  ! relative path to gridpoint forcing files
    /

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Info

Note: When using OpenIFS versions prior to CY43R3 the available namelist parameters can differ from

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the ones shown above. For instance, nudging of ozone is not available in CY40R1.

References

  • Jeuken, A., et al. (1996)  On the potential of assimilating meteorological analyses in a global climate model for the purposes of model validation,  J. Geophys. Res., 101, 16,939–16,950.  doi:10.1029/96JD01218.