3. Aerosol diagnostics and output
3.1. Outputing NorESM2 aerosol diagnostics
To run NorESM2 with more aerosol diagnostics add to user_nl_cam
:
&phys_ctl_nl
history_aerosol = .true.
Adding this entry to user_nl_cam gives
will result in an additional 577 variables (+ ca. 13 % CPU-time).
Please see an overview of additional output varibales: history_aerosol extra output
3.2. Decomposition of aerosol direct, semidirect and indirect radiative forcing
For effective radiative forcing estimates, multiple calls to the
radiation code are necessary (see Ghan et al. 2012 for a detailed
explanation). Previously, in NorESM2.0, additional
radiation-diagnostics for the decomposition of aerosol direct,
semidirect and indirect radiative forcing were activated by defining
the CPP-token AEROFFL
. In NorESM2.1, this CPP-token no longer
exists and this additional output always accompanies the standard
CAM diagnostics and also does not need the history_aerosol =
.true.
to be activated. Please see an overview of the additional
output variables: Additional Radiation Diagnostics
3.3. Output additional NorESM2 - AEROCOM diagnostics
NorESM2 can be set up to output additional aerosol diagnostics for use in AeroCom (https://aerocom.met.no/index.html) or other studies where there is a need for extensive aerosol diagnostics.
In both NorESM2.0 and NorESM21, the CPP token AEROCOM
must be defined in order to activate this output.
However, in NorESM2.1, this variable is now activated via a new CAM build-time xml variable, CAM_AEROCOM
.
By default CAM_AEROCOM
is FALSE. To activate the CPP token AEROCOM
at build time, simply issue the command
./xmlchange CAM_AEROCOM=TRUE
before calling ./case.build
.
If AEROCOM
is activated, an addition 149 variables are output (+ ca. 13% CPU-time). Please see an overview of the additional output variables:
AEROCOM extra output
3.4. References
Ghan, S.J., X. Liu, R.C. Easter, R. Zaveri, P.J. Rasch, J. Yoon, and B. Eaton, 2012: Toward a Minimal Representation of Aerosols in Climate Models: Comparative Decomposition of Aerosol Direct, Semidirect, and Indirect Radiative Forcing. J. Climate, 25, 6461–6476, https://doi.org/10.1175/JCLI-D-11-00650.1