Data storage#

The data is stored on NIRD @ sigma2 /projects/NS2345K/noresm/cases/N1850OCBDRDDMS_f19_tn14_15042019

Path to case directory#


copy on Vilje @ sigma2


Path to diagnostics#


Summary of simulation#

New in this simulation:

  • Removed the 10% increase in the sea-salt emissions

Continued to use

  • CESM2.1

  • the long wave aerosol optical depth (AOD) bug fixer

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

  • Nebula @ nsc.liu

  • the increased width of Strait of Gibraltar

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

  • 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

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

Simulation specifics#

CESM parent




Run type


Branch time from parent


Simulated years

01-01-0626 - 31-12-0799



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)#

Increase in DMS emissions @ high latitudes#

In components/micom/hamocc/beleg_bgc.F90

Line 175 changed from

epsher = 0.9         !dimensionless fraction -fraction of grazing egested


epsher = 0.85         !dimensionless fraction -fraction of grazing egested

and Line 287

dmspar(5)=1.25*0.109784522E-01  !2*0.02   production with delsil 


dmspar(5)=1.25*0.02          ! production with delsil, following Kloster et al., 06 Table 1, but increased by a factor of 2

Moist convection in CAM#

Moist convection modifications (“zmst” modifications) in


Increased error tolerance in energy conservation test in CICE#

ferr = energy conservation error (W m-2)

Line 2390 in /components/cice/src/source/ice_therm_vertical.F90

changed from

if (ferr > ferrmax) then


if (ferr > 2*ferrmax) then

Long wave AOD fix#

Long wave aerosol optical depth (AOD) bug fixer: optinterpol.F90

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.

Minor code changes#

which were included but didn’t impact the model results

Time variable in MICOM output#

Modifications added to components/micom/phy/rdlim.F

Problems with fill values on Nebula#


Line 428 from

long_name=trim(lname), units=trim(uname), fill_value=spval)


long_name=trim(lname), units=trim(uname))

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 = '/nobackup/forsk/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#

LMspinup6 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.