Data storage#

The data is stored on NIRD @ sigma2


Path to case directory#

on Fram @ sigma2


Path to diagnostics#


Summary of simulation#

The fist simulation (of many) in the NorESM2-MM spin up tree. No SourceMods included.

  • Namelist changes compared to repository for CAM6-Nor:

    • cldfrc_iceopt = 5 -> 4

    • clubb_gamma_coef = 0.308 -> 0.288

    • tau_0_ubc = .false. -> .true.

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

    • zmconv_c0_lnd = 0.0300D0 -> 0.0200D0

    • zmconv_c0_ocn = 0.0300D0 -> 0.0200D0

  • Namelist changes compared to repository for CLM5:

    • reset_snow = .true.

Simulation specifics#

CESM parent




Run type


Branch time from parent


Simulated years

01-01-0001 - 31-12-0120



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)#

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_f09_tn14_alwfix_sg30_qmnmx_20190314

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. In this simulation the iceopt = 4, for which there is no such dependence. This was changed later in N1850OCBDRDDMS_f09_tn14_qmnmxrhmin_20190314


! 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.

 do_circulation_diags = .true.

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

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

 micro_mg_dcs             = 5.5e-4

 clubb_gamma_coef = 0.288

 tau_0_ubc                = .true.

 cldfrc_iceopt          =  4                                


finidat = '/cluster/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.

Time series of spinup#

MMspinup1 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.

MMspinup1_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.