Data storage#

The data is stored on NIRD @ sigma2


Path to case directory#

on Fram @ sigma2


Path to diagnostics#


Summary of simulation#

New in this simulation:

  • CESM2.0 updated to CESM2.1 (branch featureCESM2.1.0-OsloDevelopment)

  • Bug fix in moist plume calculation and initialisation of tu (moist thermo in zm_conv.F90)

  • Different reference time in netCDF output of BLOM/MICOM (rdlim.F), do not change answer.

  • Name list changes to user_nl_cam:

    • Decreased gamma from 0.308 to 0.283

    • cldfrc2m_rhmini = 0.80D0 -> 0.90D0

    • micro_mg_dcs = 500.D-6 -> 5.5e-4

  • Compset name changed from N1850OCBDRDDMS to N1850, but the copset longname is the same

Continued to use:

  • the correction of bug in the second-order in time term of the AM correction (cd_core.F90)

  • the removal of an inconsistency in the treatment of riverine carbon inputs in iHAMOCC (mo_riverinpt.F90)

  • the increased (x2) error tolerance in energy conservation test in CICE

  • the long wave aerosol optical depth (AOD) bug fixer optinterpol.F90 included as SourceMod

  • the updated emission files for CAM6-Nor (often referred to as FRC2)

  • the increase in DMS emissions @ high latitudes in order to reduce the net radiation imbalance @TOM (top of model)

  • the increase in width of Strait of Gibraltar from 15 km to 30 km

  • the modifications to the parameterisation of ice clouds (iceopt=5 and cldfrc2m.F90)

  • the modifications to the parameters bkopal, rcalc and ropal in iHAMOCC included as SourceMod

  • the modifications to the convection code included as SourceMod: zm_conv.F90: “zmst” modifications.

  • aerotab_table_dir = ‘/cluster/shared/noresm/inputdata/noresm-only/atm/cam/camoslo/AeroTab_8jun17’

File modifications to

  • CAM6-Nor: cd_core.F90, optinterpol.F90.

  • CICE: ice_therm_vertical.F90

  • iHAMOCC: mo_riverinpt.F90, beleg_bgc.F90

were merged into featureCESM2.1.0-OsloDevelopment and the SourceMods no longer needed. Also the new emission files (frc2) and many of the parameter settings in user_nl_cam were included and no longer needed to be listed in user_nl_cam.

The increase in width of Strait of Gibraltar from 15 km to 30 km was included as default and no longer listed in user_nl_micom

The reset snow addition in user_nl_clm was included as default and no longer needed.

For all SourceMods and user name list specifics, see bottom of this page

Simulation specifics#

CESM parent




Run type


Branch time from parent


Simulated years

01-01-0451 - 31-12-0480



Git branch


Git commit






Node allocation#

    <entry id="NTASKS">
        <value compclass="ATM">1536</value>
        <value compclass="CPL">1536</value>
        <value compclass="OCN">91</value>
        <value compclass="WAV">300</value>
        <value compclass="GLC">1536</value>
        <value compclass="ICE">736</value>
        <value compclass="ROF">20</value>
        <value compclass="LND">780</value>
        <value compclass="ESP">1</value>
      <desc>number of tasks for each component</desc>

Code modifications (SourceMods)#

Ice cloud parameterisation changes#

Modified “aist” threshold in components/cam/src/physics/cam/cldfrc2m.F90

Line 47 and 48 from

real(r8),  parameter :: qist_min     = 1.e-7_r8      ! Minimum in-stratus ice IWC constraint [ kg/kg ]
real(r8),  parameter :: qist_max     = 5.e-3_r8      ! Maximum in-stratus ice IWC constraint [ kg/kg ]


real(r8),  parameter :: qist_min     = 5.e-6_r8      ! Minimum in-stratus ice IWC constraint [ kg/kg ] 
real(r8),  parameter :: qist_max     = 2.5e-4_r8     ! Maximum in-stratus ice IWC constraint [ kg/kg ]

Line 883 and Line 1137 from

aist = max(0._r8,min(1._r8,qi/qist_min)) 


aist = max(0._r8,min(1._r8,sqrt(aist*qi/qist_min)))

User name lists#


Gamma controls the skewness of Gaussian PDF for the subgrid vertical velocities (used in the Cloud Layers Unified By Binormals (CLUBB) scheme). A low gamma generally increases the amount of low clouds and hence gives a higher short-wave cloud forcing.


Iceopt is used for setting the parameterisation of ice-cloud fraction. The CESM2 default scheme for the parameterisation of the ice-cloud fraction is iceopt = 5, which includes a functional dependence of ice cloud fraction on the environmental relative humidity.


! Users should add all user specific namelist changes below in the form of
! namelist_var = new_namelist_value

 fv_am_correction= .true.
 fv_am_diag      = .true.
 fv_am_fix_lbl   = .true.
 fv_am_fixer     = .true.

 dme_energy_adjust = .true.
 aerotab_table_dir = '/cluster/shared/noresm/inputdata/noresm-only/atm/cam/camoslo/AeroTab_8jun17'

 do_circulation_diags = .true.

 clubb_history  = .false.
 history_budget = .false.
 history_vdiag  = .false.

 zmconv_c0_lnd    =  0.0200D0
 zmconv_c0_ocn    =  0.0200D0
 zmconv_ke        =  8.0E-6

 micro_mg_dcs     = 5.5e-4

 clubb_gamma_coef = 0.283

 tau_0_ubc        = .true.

 cldfrc2m_rhmini =0.90D0

Time series of spinup#

MMspinup11 NorESM2-MM spinup simulation
Left column (from top to bottom): Globally and annually averaged Surface (2m) air temperature, global and volume averaged ocean temperature, Sea surface temperature (SST).
Right column (from top to bottom): Globally and annually Globally and annually averaged Net radiation @ top of model, Atlantic meridional oveturning circulation (AMOC) @ 26.5N.

MMspinup11_emis NorESM2-MM spinup simulation
Left column (from top to bottom): Globally and annually sum of Sea salt surface emissions, DMS (dimethylsulfide) surface emissions, POM (primary organic matter) surface emissions.
Right column (from top to bottom): Globally and annually averaged shortwave cloud forcing and longwave cloud forcing.