Data storage#

The data is stored on NIRD @ sigma2


Path to case directory#

on Vilje @ sigma2


Path to diagnostics#


Summary of simulation#

New in this simulation:

  • Increased width of Strait of Gibraltar from 15 km to 30 km

Continued to use:

  • a 10% increase in the sea-salt emissions in order to reduce the net radiation imbalance @TOM (top of model)

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

  • the modifications to the convection code included as SourceMod

  • the namelist changes compared to repository for CAM6-Nor, MICOM and CLM5

Not included in this simulation:

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

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

Simulation specifics#

CESM parent




Run type


Branch time from parent


Simulated years

01-01-0361 - 31-12-0420



Git branch


Git commit






Node allocation#

 <entry id="NTASKS">
        <value compclass="ATM">768</value>
        <value compclass="CPL">768</value>
        <value compclass="OCN">186</value>
        <value compclass="WAV">300</value>
        <value compclass="GLC">768</value>
        <value compclass="ICE">504</value>
        <value compclass="ROF">8</value>
        <value compclass="LND">256</value>
        <value compclass="ESP">1</value>
      <desc>number of tasks for each component</desc>

Code modifications (SourceMods)#

iHAMOCC modifications#

In components/micom/hamocc/beleg_bgc.F90

Line 209

bkopal = 1.e-6    !i.e. 1.0 mmol Si/m3 


bkopal = 5.e-6    !i.e. 1.0 mmol Si/m3 

Line 269 from

#elif defined(WLIN) 
      rcalc = 48.  ! calcium carbonate to organic phosphorous production ratio
      ropal = 35.  ! opal to organic phosphorous production ratio 


#elif defined(WLIN) 
      rcalc = 35.  ! calcium carbonate to organic phosphorous production ratio
      ropal = 45.  ! opal to organic phosphorous production ratio 

1.1 x seasalt emissions#

Line 176 in components/cam/src/chemistry/oslo_aero/seasalt_model.F90

!Eqn. 9 in Salter et al. (2015)
       numberFlux(:ncol,n) = 1.1_r8*whitecapAreaFraction(:ncol)*                                                     &
                            ( coeffA(n)*(sst(:ncol)-273.15_r8)*(sst(:ncol)-273.15_r8)*(sst(:ncol)-273.15_r8)  &
                            + coeffB(n)*(sst(:ncol)-273.15_r8)*(sst(:ncol)-273.15_r8)                         &
                            + coeffC(n)*(sst(:ncol)-273.15_r8)                                                &
                            + coeffD(n) )

Moist convection in CAM#

Moist convection modifications (“zmst” modifications) in


Increased error tolerance in energy conservation test in CICE#

Not included in this simulation

Includes the long wave aod error#

Information about the bug: The aerosol long wave calculations used information from the aerosol shortwave interpolation on aerosol size. The result was that aerosol longwave forcing was not included during night. A first estimate based on estimates from AMIP simulation is + 0.03 W/m2. The forcing is not evenly distributed, but mostly focused on Sahara including downstream and the Arabian peninsula. The numbers here are around 1-2 W/m2.

Note this bug was fixed in N1850OCBDRDDMS_f19_tn14_07052019

User name lists#


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

 dme_energy_adjust = .true.

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

 micro_mg_dcs             = 5.0e-4

 clubb_gamma_coef = 0.258

 tau_0_ubc                = .true.

 cldfrc_iceopt          =  4
aerotab_table_dir =


Reset snow: Remove infiltration excess water as runoff if the temperature of the surface water pool is below freezing.

finidat = '/work/shared/noresm/inputdata/cesm2_init/b.e20.B1850.f09_g17.pi_control.all.297/0308-01-01/b.e20.B1850.f09_g17.pi_control.all.297.clm2.r.0308-01-01-00000.nc'
use_init_interp = .true.
reset_snow = .true.


Increased width of Strait of Gibraltar from 15 km to 30 km

set CWMWTH = "      30.e3,      30.e3"

Time series of spinup#

LMspinup3 NorESM2-LM spinup simulations
Left column (from top to bottom): Globally and annually averaged Net radiation @ top of model, Surface (2m) air temperature, Sea surface temperature (SST), global and volume averaged ocean temperature, Atlantic meridional oveturning circulation (AMOC) @ 26.5N.
Right column (from top to bottom): Globally and annually sum of Sea salt surface emissions, DMS (dimethylsulfide) surface emissions, globally and annually averaged vertically-integrated total cloud cover, shortwave cloud forcing and longwave cloud forcing.