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B.13 Complete list of CAM namelist variables

Table B.1 displays all supported variables. Most of the variables in CAMEXP are single-valued, but some are array-valued. Included in the table are the following pieces of information:

Variable name.
Variable type (Char, Integer, Real, or Logical). If the variable is of type Char, then its declared length is displayed along with the variable type (e.g. CTITLE is 80 characters in length, therefore Char*80 is entered in the "Type" column).
Default value.
References to examples in Section 2.3 demonstrating usage.
Variable description

Table B.1: CAMEXP namelist variables
Name Type Default Ex. Description

ABSEMS_DATA

Char*256 See Desc. Filename of absorption/emission dataset. This file is a required input dataset. It consists of terms used for determining the absorptivity and emissivity of water vapor in the longwave parameterization of radiation. Default is set in DefaultCAMEXPNamelist.xml.

ADIABATIC

Logical .FALSE. If true, do not run model physics, only run the dynamical core. In this mode, water vapor is advected as a passive tracer. Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.

AEROPTICS

Char*256 See Desc. Full pathname of dataset for time-invariant aerosol optical properties. Default is set in DefaultCAMEXPNamelist.xml.

AERO_CARBON

Logical .FALSE. If true, turn on carbon prognostic aerosols.

AERO_FEEDBACK_CARBON

Logical .FALSE. If true, turn on feedback of carbon prognostic aerosols. May only be true if AERO_CARBON is also true.

AERO_FEEDBACK_SEA_SALT

Logical .FALSE. If true, turn on feedback of sea salt prognostic aerosols. May only be true if AERO_SEA_SALT is also true.

AERO_SEA_SALT

Logical .FALSE. If true, turn on sea salt prognostic aerosols.

AQUA_PLANET

Logical false Run model in "AQUA_PLANET" mode. Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.

ARCHIVE_DIR

Char*256 See Desc. Head mass store archival directory name. Default is /$USER/csm/caseid/ (where caseid is the caseid from the namelist and $USER is the username converted to uppercase.) CAM history files will be stored under $ARCHIVE_DIR/atm/hist, restart files under $ARCHIVE_DIR/atm/rest, and initial files under $ARCHIVE_DIR/atm/init. Land-model output files will be stored under similar directory names with "lnd" to specify the land-model subdirectory.

AVGFLAG_PERTAPE (6)

Char*1 See Desc. Sets the averaging flag for all variables on a particular history file series. Default is to use default averaging flags for each variable Valid values are A, I, X, and M, indicating Average (A), Instantaneous (I), Maximum (X), and Minimum (M).

BGSCL_RF

Real 0 Set background aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and are is used when RADFORCE is true.

BNDTVAER

Char*256 See Desc. Full pathname of time-variant boundary dataset for aerosol mass mixing ratios. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVCARBONSCALE

Char*256 See Desc. Full pathname of time-variant boundary dataset for carbon scaling. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVDMS

Char*256 See Desc. Full pathname of time-variant boundary dataset for DMS surface emissions. This is used as an input for prognostic sulfate computations. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVGHG

Char*256 See Desc. Full pathname of time-variant boundary dataset for greenhouse gas surface values. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVG

Char*256 See Desc. Full pathname of time-variant boundary dataset for greenhouse loss rates. (required if trace_gas is set to true). Default is set in DefaultCAMEXPNamelist.xml.

BNDTVOXID

Char*256 See Desc. Full pathname of time-variant boundary dataset for oxidants. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVO

Char*256 See Desc. Full pathname of time-variant ozone mixing ratios boundary dataset (NetCDF format). Default is set in DefaultCAMEXPNamelist.xml.

BNDTVSCON

Char*256 See Desc. Full pathname of time-variant boundary dataset for solar constant. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVSF6

Char*256 See Desc. Full pathname of time-variant boundary dataset for tracer test emissions (required if tracers_flag is set to true). Default is set in DefaultCAMEXPNamelist.xml.

BNDTVSOX

Char*256 See Desc. Full pathname of time-variant boundary dataset for SOx surface emissions. Default is set in DefaultCAMEXPNamelist.xml.

BNDTVS

Char*256 See Desc. , , Full pathname of time-variant sea-surface temperature and sea-ice concentration boundary dataset (NetCDF format). Default is set in DefaultCAMEXPNamelist.xml.

BNDTVVOLC

Char*256 See Desc. Full pathname of time-variant boundary dataset for stratospheric volcanic aerosol mass mixing ratios. Default is set in DefaultCAMEXPNamelist.xml.

BRNCH_RETAIN_CASENAME

logical false If TRUE, use the pre-existing case name for a branch run.

CALENDAR

Char*32 NO_LEAP Calendar type 'NO_LEAP' for consistent 365-days per year or 'GREGORIAN' to include leap-years. Note that if "GREGORIAN" is selected although leap-years will be used in the calender manager the calculation of the earth's orbit still assumes 365 day years., Valid values: "NO_LEAP" or "GREGORIAN"

CARSCL_RF

Real 0 Set carbon aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when RADFORCE is true.

CARSCL

Real 1.0 Set carbon aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

CASEID

Char*32 camrun Case identifier (saved in history file header record) and normally used as part of the MSS path name (see the ARCHIVE_DIR namelist option). By default also used in output filenames (see the HFILENAME_SPEC namelist option). Setting is Required.

CH4VMR

Real 1.714e-6 CH $_{4}$ volume mixing ratio.

CO2VMR

Real 3.550e-4 CO $_{2}$ volume mixing ratio

CO_EMIS

Char*256 See Desc. Full pathname of time-variant boundary dataset for fossil fuel carbon surface emissions. Default is set in DefaultCAMEXPNamelist.xml.

CTITLE

Char*80 None Case title

DIF2

Real See Desc. del horizontal diffusion coefficient. Default is resolution dependent, e.g. 2.5e5 for T42 EUL. Not used for fv dynamics.

DIF4

Real See Desc. del horizontal diffusion coefficient. Default is resolution dependent, e.g. 1.0e16 for T42 EUL. Not used for fv dynamics.

DIVDAMPN

Real 0.0 Number of days (from timestep 0) to run divergence damper. Use only if model becomes dynamicallly unstable during initialization. Suggested value: 2. (Value must be 0.) Not used for fv dynamics.

DOISCCP

Logical false If true, the ISCCP cloud simulator will be run, and output added to the monthly history files.

DTIME

Real See Desc. Length of model timestep in seconds. CAUTION: Changing this variable directly impacts the physical parameterizations in the model and may impact the climate. Changing resolution usually requires a change in DTIME. Defaults are resolution-dependent, e.g 1200. for T42 EUL; 1800 for FV 2x2.5.

DUSTSCL_RF

Real 0 Set dust aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when RADFORCE is true.

DUSTSCL

Real 1.0 Set dust aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

DYN_ALLGATHER

Integer 0 dynamics gather option. (only used with EUL and SLD dycores).

DYN_ALLTOALL

Integer 0 dynamics transpose option. (only used with EUL and SLD dycores).

ECCEN

Real None Earth's eccentricity of orbit. (unitless: typically 0. to 0.1). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.

EMPTY_HTAPES

Logical .FALSE. If set don't put any of the variables on the history tapes by default. Only output the variables that the user explicitly lists in the fincl# namelist items.

EPS

Real 0.06 Time filter coefficient.

F11VMR

Real 0.280e-9 CFC $_{11}$ volume mixing ratio.

F12VMR

Real 0.503e-9 CFC $_{12}$ volume mixing ratio.

FEXCL1, FEXCL2, FEXCL3, FEXCL4, FEXCL5, FEXCL6

(200) Char*8 None List of fields to exclude on the default history files (must be in Master Field List). The default history files include a monthly series and a daily series. For a list of what fields are included on the first history file series by default see tab:mfl.

FHSTPR1, FHSTPR2, FHSTPR3, FHSTPR4, FHSTPR5, FHSTPR6

(200) Char*8 None Specific fields for each history file for which to use the non-default history buffer precision.

FINCL1, FINCL2, FINCL3, FINCL4, FINCL5, FINCL6

(200) Char*8 None , List of fields to include on the history files. The added fields must be in Master Field List see tab:mfl for the list of fields that can be added as well as which fields are on the first history file series by default (FINCL1). Using a ":" following a field gives the averaging flag for the output field. Valid flags are: I for instantaneous, A for average, M for minimum, and X for maximum. See Section 2.5.1.1 for more information on the averaging flag.

FINCL1LONLAT, FINCL2LONLAT, FINCL3LONLAT, FINCL4LONLAT, FINCL5LONLAT

(200) Char*8 None List of columns or contiguous columns at which the fincl1 fields will be output. Individual columns are specified as a string using a longitude degree (greater or equal to 0.) followed by a single character (e)ast/(w)est identifer, an underscore '_' , and a latitude degree followed by a single character (n)orth/(s)outh identifier. For example, '10e_20n' would pick the model column closest to 10 degrees east longitude by 20 degrees north latitude. A group of contiguous columns can be specified using bounding latitudes and longitudes separated by a colon. For example, '10e:20e_15n:20n' would select the model columns which fall with in the longitude range from 10 east to 20 east and the latitude range from 15 north to 20 north.

FLXAVE

Logical See Desc. This namelist variable is only used when running through the flux coupler. In that case, the default value is true. If true, data is sent to the flux coupler only on radiation time steps.

FORCE_2D

Integer 0 option to force transpose computation for 1D decomp. (used with Finite-Volume dynamical core only).

FWRTPR1, FWRTPR2, FWRTPR3, FWRTPR4, FWRTPR5, FWRTPR6

(200) Char*8 None Specific fields for each history file which will be written using the non-default precision.

GEOPKTRANS

Integer 0 Geopotential method (used with Finite-Volume dynamical core only).

HFILENAME_SPEC (6)

Char*256 See Desc. Array of history filename specifiers. Defaults are "%c.cam2.h%t.%y-%m", "%c.cam2.h%t.%y-%m-%d-%s", "%c.cam2.h%t.%y-%m-%d-%s", ... Filename, specifiers give generic formats for the filenames with the specific dates, file-series number, and caseid, filled in when the files are created. The following strings are expanded when the filename is created:

%c = caseid

%t = tape series number (0-5)

%y = year (normally 4 digits, more digits if needed)

%m = month

%d = day

%s = seconds into current day

%% = % symbol

For example, for a simulation with caseid="test" and current date of 0000/12/31 0:00UT, the monthly average files with a filename specifier of "%c.cam2.h%t.%y-%m.nc" expand into "test.cam2.h0.0000-12.nc", daily files with a filename specifier of "%c.cam2.h%t.%y-%m-%d-%s.nc" expand to ""test.cam2.h0.0000-12-31-00000.nc". Spaces are not allowed in filename specifiers. Although the character "/" is allowed in the specifier, it will be interpreted as a directory name and the corresponding directories will have to be created in the model execution directory (directory given to configure with -cam_exedir option) before model execution.

ICE_CONSCHK_FRQ

Integer 0 This is not used only when running as part of CCSM. If n  0, sea ice global energy checking will be done every n timesteps. If n  0, sea ice global energy checking will be done every n days.

IDEAL_PHYS

Logical false If true, Run ONLY the "idealized" dynamical core of the model (dynamics + Held&Suarez-specified physics). Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.

INDIRECT

Logical false If true, include the indirect radiative effects of sulfate aerosols.

INITHIST

Char*8 YEARLY Frequency that initial files will be output: 6-hourly, daily, monthly, yearly, or never. Valid values: 'NONE', '6-HOURLY', 'DAILY', 'MONTHLY', 'YEARLY'

IORD

Integer 4 East-west transport scheme (used with Finite-Volume dynamical core only).

IRADAE

Integer -12 Frequency of absorptivity/emissivity calculations in time steps (if positive) or model hours (if negative). To avoid having the abs/ems values saved on the restart output, this variable should divide evenly into MFILT(1)*NHTFRQ(1).

IRADLW

Integer -1 Frequency of long-wave radiation calculation in timesteps (if positive) or model hours (if negative).

IRADSW

Integer -1 Frequency of short-wave radiation calculation in timesteps (if positive) or model hours (if negative).

ISCCPDATA

Char*256 See Desc. Full pathname of time-invariant dataset used by the ISCCP cloud simulator. Default is set in DefaultCAMEXPNamelist.xml.

ITSST

Integer 1 Frequency of SST update in timesteps.

IYEAR_AD

Integer 1950 , Year (AD) used to compute earth's orbital parameters. If not set, then use the values from the eccen, mvelp, and obliq namelist parameters. If only IYEAR_AD is set, orbital parameters will be computed automatically (based on Berger, 1977). If one of OBLIQ, ECCEN, OR MVELP is set, all three must be set. If all four of the above are set by the user, IYEAR_AD takes precedence. Setting is Required unless ECCEN, OBLIQ and MVELP are set. Not used when running as part of CCSM.

JORD

Integer 4 North-south transport scheme (used with Finite-Volume dynamical core only).

KMXHDC

Integer 5 Number of levels over which to apply Courant limiter, starting at top of model.

KORD

Integer 4 Vertical mapping (used with Finite-Volume dynamical core only).

LINEBUF

Logical .FALSE. If true, force buffer flush of stdout with each new-line generated (useful for debugging).

MFILT(6)

Integer 30, 30, 30, ... , , Array of number of time samples to write to each history files series (a time sample is the history output from a given timestep).

MODCOMM_GEOPK

Integer 0 mod_comm geopk method (varies with mpi/mpi2 choice) (used with Finite-Volume dynamical core only).

MODCOMM_TRANSPOSE

Integer 0 mod_comm transpose method (varies with mpi/mpi2 choice) (used with Finite-Volume dynamical core only).

MSS_IRT

Integer 365 , , , Retention period in days for history and restart files stored on NCAR Mass Store. If MSS_IRT=0, no history or restart files will be archived.

MSS_WPASS

Char*8 None , NCAR Mass Store write password for all output datasets. Must remain the same throughout a case run, or a continuation run will not update original history files.

MVELP

Real None Earth's moving vernal equinox at perihelion (degrees: 0. to 360.0). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.

N2OVMR

Real 0.311e-6 N $_{2}$ O volume mixing ratio.

NCDATA

Char*256 See Desc. , Full pathname of initial atmospheric state dataset (NetCDF format). See Section 2.5.1 for details. Default is set in DefaultCAMEXPNamelist.xml.

NDENS(6)

Integer 2, 2, 2, ... , , Array specifying output format for each history file series. Valid values are 1 or 2. "1" implies output to be written out in 64-bit NetCDF format, and "2" writes data out in 32-bit NetCDF format.

NELAPSE

Integer None Elapsed time to run. In time steps (positive) or days (negative) to run. May be entered instead of NESTEP or STOP_YMD and STOP_TOD. Note, NESTEP is not required or used when running as part of CCSM. Setting is Required if NESTEP or STOP_YMD not set.

NESTEP

Integer None Ending timestep. If positive the ending absolute timestep (from the start of the initial run). If negative the ending absolute number of days to process (from the start of the initial run). Either NELAPSE, NESTEP or (STOP_YMD,STOP_TOD) must be set if not running through flux coupler. (STOP_YMD,STOP_TOD) take precedence if set. Note, NESTEP is not required or used when running as part of CCSM. Setting is Required if NELAPSE and STOP_YMD not set.

NHSTPR(6)

Real 8, 8, 8, ... Default history buffer precision (8 or 4 bytes) for each history file.

NHTFRQ(6)

Integer 0, -24, -24, -24, ... , , Array of write frequencies for each history files series. If NHTFRQ(1)=0, the file will be a monthly average. Only the first file series may be a monthly average. If NHTFRQ(i)0, frequency is input as number of timesteps. If NHTFRQ(i)0, frequency is input as number of hours. Note that NHTRFQ(1) also controls the frequency of restart dataset writes if NREFRQ = 1.

NLVDRY

Integer 3 Number of layers from the top of the model over which to do dry convective adjustment. Must be less than plev (the number of vertical levels).

NPR_YZ

Integer 0, 0, 0, 0 YZ and XY decompositions (used with Finite-Volume dynamical core only).

NREFRQ

Integer 1 Controls whether restart datasets are written. This variable can only be 1 or 0. If 1, restart files are written and archived for every archive of the first history file series. If this variable is 0, then no restarts are written.

NREVSN

Char*256 None Full pathname of master restart file from which to branch. Setting is Required for branch run.

NSPLIT

Integer 0 Lagrangian time splits when using Finite-Volume dynamics. If zero, a best-estimate will be automatically calculated.

NSREST

Integer 0 , , Run type: 0=initial , 1=restart , 3=branch

NUSR_ADV

Integer 0 number of user defined advected tracers

NUSR_NAD

Integer 0 number of user defined non-advected tracers

OBLIQ

Real None Earth's orbital angle of obliquity (degrees: -90. to +90., typically 22. to 26.). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.

OMPNEST

Integer 0 Option for nested openmp (used with Finite-Volume dynamical core only).

OZNCYC

Logical .TRUE. Flag for yearly cycling of ozone data. If set to .FALSE., a multi-year dataset is assumed, otherwise a single-year dataset is assumed, and ozone will be cycled over the first 12 values in the file.

PERPETUAL_RUN

Logical false Set to .true. to specify that the run will use a perpetual calendar. If perpetual_ymd is not set then the perpetual date will be read from the initial file.

PERPETUAL_YMD

Logical false Perpetual date specified as (year*1000 + month*100 + day). This date overrides the date from the initial file. If aqua_planet=.true. then perpetual_ymd is ignored and the perpetual date is set to 321.

PERTLIM

Real 0.0 Perturb the initial conditions for temperature randomly by up to the given amount. Only applied for initial simulations.

PHYS_ALLTOALL

Integer 0 Dynamics/physics transpose option.

PHYS_CHNK_PER_THD

Integer 1 Select target number of chunks per thread. Must be positive

PHYS_LOADBALANCE

Integer 0 Select different options for organization of physics chunks. Each uses a different scheme for static load balancing.

PRECC_THRESH

Real 0.1 mm/hr Precipitation threshhold for use with the PRECCINT and PRECCFRQ fields for history files.

PRECL_THRESH

Real 0.05 mm/hr Precipitation threshhold for use with the PRECLINT and PRECLFRQ fields for history files.

PRESCRIBED_SULFUR

char*16 direct Control radiative interaction of prescribed sulfur. May be set to "passive" or "direct". passive = prescribed sulfur has no radiative interaction direct = prescribed sulfur drives radiative interaction

PRINT_STEP_COST

Logical .FALSE. If true, print CPU timing per model timestep.

PROGNOSTIC_ICESNOW

Logical .TRUE. Accumulate snow over sea-ice (with a 0.5m maximum). If .FALSE. then use a climatology for snow depth.

PROGNOSTIC_SULFUR

char*16 off Control prognostic sulfur calculations. May be set to "off", "passive", or "direct". off = no prognostic sulfur (default) passive = prognostic sulfur computed with no radiative interaction direct = prognostic sulfur computed and drives radiative interaction

RADFORCE

Logical false Compute forcing from aerosols

RAMPYEAR_GHG

integer 0 Ramped gases fixed at this year if set to a value greater than zero. Only used if SCENARIO_GHG is set to RAMPED.

RAMPYEAR_PRESCRIBED_SULFUR

integer none This variable is reserved for future use. No value is permitted.

RAMPYEAR_PROGNOSTIC_SULFUR

integer none Set to YYYY in order to cycle that year of sox emissions.

RAMPYEAR_SCON

integer 0 Ramped scon fixed at this year if set to a value greater than zero. Only used if SCENARIO_SCON is set to RAMPED.

RAMP_CO2_ANNUAL_RATE

real 1.0 percentage amount of co2 ramping per year

RAMP_CO2_CAP

real See Desc. co2 cap if rate  0, floor otherwise; specified as multiple or fraction of inital value; e.g. setting to 4.0 will cap at 4x initial co2 setting; default is boundless if rate  0, zero otherwise

RAMP_CO2_START_YMD

integer 0 date on which ramping of co2 begins; REQUIRED to be set for scenario_ghg='RAMP_CO2_ONLY'

READTRACE

Logical .TRUE. If true, initialize data for all consituents found on the initial conditions dataset. Otherwise data will be initialized using internally-specified default values.

REF_TOD

Integer See Desc. Reference time-of-day (seconds). Default is to use starting time of day

REF_YMD

Integer Reference date for run as yyyymmdd. Default is to use starting date. The reference date is the reference for the time variable output on the history files.

RESET_CSIM_ICE_PROPS

Logical .FALSE. Reset the CSIM ice-model properties. Snow-cover is set to zero, and ice-temperatures are all set to freezing. This is important when starting from an initial dataset that isn't in equilibrium. This is used, for example, when starting from initial conditions that are interpolated from a different resolution.

REST_PFILE

Char*256 See Desc. Full pathname of restart pointer file. Default is $HOME/ cam2.CASEID.rpointer

SCENARIO_CARBON_SCALE

char*16 FIXED Controls carbon scaling. May be set to 'FIXED' or 'RAMPED'. FIXED means use the value specified by CARSCL. RAMPED means use data from file specified by BNDTVCARBONSCALE.

SCENARIO_GHG

char*16 FIXED Controls treatment of specified co2,ch4,n2o,cfcf11,cfc12 volume mixing ratios. May be set to 'FIXED' or 'RAMPED' or 'RAMP_CO2_ONLY'. FIXED = volume mixing ratios are fixed and have either default or namelist input values RAMPED = volume mixing ratios are ramped RAMP_CO2_ONLY = only co2 mixing ratios are ramped

SCENARIO_PRESCRIBED_SULFUR

char*16 FIXED Controls prescribed sulfur amounts. Can only be set to 'FIXED'! FIXED = uses climatology

SCENARIO_PROGNOSTIC_SULFUR

char*16 RAMPED Sets so2 and so4 surface fluxes. May only be set to 'RAMPED'! RAMPED = uses boundary data set bndtvsox. Only used if PROGNOSTIC_SULFUR is set to PASSIVE or DIRECT.

SCENARIO_SCON

char*16 FIXED Controls the solar constant. Can be set to 'FIXED' or 'RAMPED'. FIXED = scon is fixed and can have either the default or namelist value. RAMPED = scon is ramped.

SCON

Real 1.367E6 Solar constant (CGS)

SOIL_EROD

Char*256 See Desc. Full pathname of time-variant boundary dataset for soil erodibility factors. Default is set in DefaultCAMEXPNamelist.xml.

SOM_CONSCHK_FRQ

Integer 0 This is used only when running with the slab ocean model. If n  0, SOM global energy checking will be done every n timesteps. If n  0, SOM global energy checking will be done every n days.

SSLTSCL_RF

Real 0 Set sea salt aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when RADFORCE is true.

SSLTSCL

Real 1.0 Set sea salt aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

SSTCYC

Logical .TRUE. Flag for yearly cycling of SST data. If set to .FALSE., a multi-year dataset is assumed, otherwise a single-year dataset is assumed, and SSTs will be cycled over the first 12 values in the file. Not used if running with CCSM.

START_TOD

Integer See Desc. Starting time-of-day (seconds). Default is to use time of day from initial condition dataset. If not input, value is set to NCSEC from initial dataset header.

START_YMD

Integer See Desc. Starting date for run as yyyymmdd. Default is to Use date from initial condition dataset. If not input, value is set to NCDATE from initial dataset header.

STOP_TOD

Integer 0 Stopping time of day for run in seconds since 0Z. Not used when running through flux coupler.

STOP_YMD

Integer None Stopping date for run encoded in yearmmdd format. Either NELAPSE, NESTEP or STOP_YMD (and possibly STOP_TOD) must be set if not running through flux coupler. (STOP_YMD,STOP_TOD) takes precedence if set. STOP_YMD is not required or used when running as part of CCSM. Setting is Required if NELAPSE and NESTEP not set.

STRAT_VOLCANIC

Logical false Use stratospheric volcanic aerosols masses and couple with radiative forcing computations.

SULSCL_RF

Real 0 Set sulfur aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when RADFORCE is true.

SULSCL

Real 1.0 Set sulfur aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

SWAP_COMM_ORDER

Integer 0 Performance tuning option for swap communication. (only used with EUL and SLD dycores).

SWAP_COMM_PROTOCOL

Integer 0 Performance tuning option for swap communication. (only used with EUL and SLD dycores).

TAUBACK

Real 0.0 Optical depth of (rh = 0.8, sulfate-like) background aerosol.

TAUVIS

Real 0.14 Visible optical depth.

TRACERTRANS

Integer 0 Number of simultaneously transposed tracers (used with Finite-Volume dynamical core only).

TRACE_GAS

Logical false If true, turn on prognostic greenhouse gas calculations for CH4, N2O, CFC11 and CFC12. This requires adding the option ``-nadv 7'' when running configuration.

USE_ETA

Logical .FALSE. If TRUE, use the vertical coordinate (eta) values defined in the finite volume dynamical core code rather than the values defined on the input dataset (used with Finite-Volume dynamical core only).

VOLCSCL_RF

Real 0 Set volcanic aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when RADFORCE is true.

VOLCSCL

Real 1.0 Set volcanic aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

**Table B.1:** **CAMEXP namelist variables**
Name	Type	Default	Ex.	Description
`ABSEMS_DATA`	`Char*256`	See Desc.		Filename of absorption/emission dataset. This file is a required input dataset. It consists of terms used for determining the absorptivity and emissivity of water vapor in the longwave parameterization of radiation. Default is set in DefaultCAMEXPNamelist.xml.
`ADIABATIC`	`Logical`	`.FALSE.`		If true, do not run model physics, only run the dynamical core. In this mode, water vapor is advected as a passive tracer. Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.
`AEROPTICS`	`Char*256`	See Desc.		Full pathname of dataset for time-invariant aerosol optical properties. Default is set in DefaultCAMEXPNamelist.xml.
`AERO_CARBON`	`Logical`	`.FALSE.`		If true, turn on carbon prognostic aerosols.
`AERO_FEEDBACK_CARBON`	`Logical`	`.FALSE.`		If true, turn on feedback of carbon prognostic aerosols. May only be true if AERO_CARBON is also true.
`AERO_FEEDBACK_SEA_SALT`	`Logical`	`.FALSE.`		If true, turn on feedback of sea salt prognostic aerosols. May only be true if AERO_SEA_SALT is also true.
`AERO_SEA_SALT`	`Logical`	`.FALSE.`		If true, turn on sea salt prognostic aerosols.
`AQUA_PLANET`	`Logical`	`false`		Run model in "AQUA_PLANET" mode. Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.
`ARCHIVE_DIR`	`Char*256`	See Desc.		Head mass store archival directory name. Default is /$USER/csm/caseid/ (where caseid is the caseid from the namelist and $USER is the username converted to uppercase.) CAM history files will be stored under $ARCHIVE_DIR/atm/hist, restart files under $ARCHIVE_DIR/atm/rest, and initial files under $ARCHIVE_DIR/atm/init. Land-model output files will be stored under similar directory names with "lnd" to specify the land-model subdirectory.
`AVGFLAG_PERTAPE (6)`	`Char*1`	See Desc.		Sets the averaging flag for all variables on a particular history file series. Default is to use default averaging flags for each variable Valid values are A, I, X, and M, indicating Average (A), Instantaneous (I), Maximum (X), and Minimum (M).
`BGSCL_RF`	`Real`	`0`		Set background aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and are is used when `RADFORCE` is true.
`BNDTVAER`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for aerosol mass mixing ratios. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVCARBONSCALE`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for carbon scaling. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVDMS`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for DMS surface emissions. This is used as an input for prognostic sulfate computations. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVGHG`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for greenhouse gas surface values. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVG`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for greenhouse loss rates. (required if trace_gas is set to true). Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVOXID`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for oxidants. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVO`	`Char*256`	See Desc.		Full pathname of time-variant ozone mixing ratios boundary dataset (NetCDF format). Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVSCON`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for solar constant. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVSF6`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for tracer test emissions (required if tracers_flag is set to true). Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVSOX`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for SOx surface emissions. Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVS`	`Char*256`	See Desc.	, ,	Full pathname of time-variant sea-surface temperature and sea-ice concentration boundary dataset (NetCDF format). Default is set in DefaultCAMEXPNamelist.xml.
`BNDTVVOLC`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for stratospheric volcanic aerosol mass mixing ratios. Default is set in DefaultCAMEXPNamelist.xml.
`BRNCH_RETAIN_CASENAME`	`logical`	false		If TRUE, use the pre-existing case name for a branch run.
`CALENDAR`	`Char*32`	`NO_LEAP`		Calendar type 'NO_LEAP' for consistent 365-days per year or 'GREGORIAN' to include leap-years. Note that if "GREGORIAN" is selected although leap-years will be used in the calender manager the calculation of the earth's orbit still assumes 365 day years., Valid values: `"NO_LEAP"` or `"GREGORIAN"`
`CARSCL_RF`	`Real`	`0`		Set carbon aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when `RADFORCE` is true.
`CARSCL`	`Real`	`1.0`		Set carbon aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.
`CASEID`	`Char*32`	camrun		Case identifier (saved in history file header record) and normally used as part of the MSS path name (see the ARCHIVE_DIR namelist option). By default also used in output filenames (see the HFILENAME_SPEC namelist option). Setting is Required.
`CH4VMR`	`Real`	`1.714e-6`		CH $_{4}$ volume mixing ratio.
`CO2VMR`	`Real`	`3.550e-4`		CO $_{2}$ volume mixing ratio
`CO_EMIS`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for fossil fuel carbon surface emissions. Default is set in DefaultCAMEXPNamelist.xml.
`CTITLE`	`Char*80`	None		Case title
`DIF2`	`Real`	`See Desc.`		del horizontal diffusion coefficient. Default is resolution dependent, e.g. 2.5e5 for T42 EUL. Not used for fv dynamics.
`DIF4`	`Real`	`See Desc.`		del horizontal diffusion coefficient. Default is resolution dependent, e.g. 1.0e16 for T42 EUL. Not used for fv dynamics.
`DIVDAMPN`	`Real`	`0.0`		Number of days (from timestep 0) to run divergence damper. Use only if model becomes dynamicallly unstable during initialization. Suggested value: 2. (Value must be 0.) Not used for fv dynamics.
`DOISCCP`	`Logical`	`false`		If true, the ISCCP cloud simulator will be run, and output added to the monthly history files.
`DTIME`	`Real`	See Desc.		Length of model timestep in seconds. CAUTION: Changing this variable directly impacts the physical parameterizations in the model and may impact the climate. Changing resolution usually requires a change in `DTIME`. Defaults are resolution-dependent, e.g 1200. for T42 EUL; 1800 for FV 2x2.5.
`DUSTSCL_RF`	`Real`	`0`		Set dust aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when `RADFORCE` is true.
`DUSTSCL`	`Real`	`1.0`		Set dust aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.
`DYN_ALLGATHER`	`Integer`	0		dynamics gather option. (only used with EUL and SLD dycores).
`DYN_ALLTOALL`	`Integer`	0		dynamics transpose option. (only used with EUL and SLD dycores).
`ECCEN`	`Real`	None		Earth's eccentricity of orbit. (unitless: typically 0. to 0.1). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.
`EMPTY_HTAPES`	`Logical`	`.FALSE.`		If set don't put any of the variables on the history tapes by default. Only output the variables that the user explicitly lists in the `fincl#` namelist items.
`EPS`	`Real`	`0.06`		Time filter coefficient.
`F11VMR`	`Real`	`0.280e-9`		CFC $_{11}$ volume mixing ratio.
`F12VMR`	`Real`	`0.503e-9`		CFC $_{12}$ volume mixing ratio.
`FEXCL1, FEXCL2, FEXCL3, FEXCL4, FEXCL5, FEXCL6` (200)	`Char*8`	None		List of fields to exclude on the default history files (must be in Master Field List). The default history files include a monthly series and a daily series. For a list of what fields are included on the first history file series by default see tab:mfl.
`FHSTPR1, FHSTPR2, FHSTPR3, FHSTPR4, FHSTPR5, FHSTPR6` (200)	`Char*8`	None		Specific fields for each history file for which to use the non-default history buffer precision.
`FINCL1, FINCL2, FINCL3, FINCL4, FINCL5, FINCL6` (200)	`Char*8`	None	,	List of fields to include on the history files. The added fields must be in Master Field List see tab:mfl for the list of fields that can be added as well as which fields are on the first history file series by default (FINCL1). Using a ":" following a field gives the averaging flag for the output field. Valid flags are: I for instantaneous, A for average, M for minimum, and X for maximum. See Section 2.5.1.1 for more information on the averaging flag.
`FINCL1LONLAT, FINCL2LONLAT, FINCL3LONLAT, FINCL4LONLAT, FINCL5LONLAT` (200)	`Char*8`	None		List of columns or contiguous columns at which the fincl1 fields will be output. Individual columns are specified as a string using a longitude degree (greater or equal to 0.) followed by a single character (e)ast/(w)est identifer, an underscore '_' , and a latitude degree followed by a single character (n)orth/(s)outh identifier. For example, '10e_20n' would pick the model column closest to 10 degrees east longitude by 20 degrees north latitude. A group of contiguous columns can be specified using bounding latitudes and longitudes separated by a colon. For example, '10e:20e_15n:20n' would select the model columns which fall with in the longitude range from 10 east to 20 east and the latitude range from 15 north to 20 north.
`FLXAVE`	`Logical`	`See Desc.`		This namelist variable is only used when running through the flux coupler. In that case, the default value is true. If true, data is sent to the flux coupler only on radiation time steps.
`FORCE_2D`	`Integer`	0		option to force transpose computation for 1D decomp. (used with Finite-Volume dynamical core only).
`FWRTPR1, FWRTPR2, FWRTPR3, FWRTPR4, FWRTPR5, FWRTPR6` (200)	`Char*8`	None		Specific fields for each history file which will be written using the non-default precision.
`GEOPKTRANS`	`Integer`	0		Geopotential method (used with Finite-Volume dynamical core only).
`HFILENAME_SPEC (6)`	`Char*256`	See Desc.		Array of history filename specifiers. Defaults are "%c.cam2.h%t.%y-%m", "%c.cam2.h%t.%y-%m-%d-%s", "%c.cam2.h%t.%y-%m-%d-%s", ... Filename, specifiers give generic formats for the filenames with the specific dates, file-series number, and caseid, filled in when the files are created. The following strings are expanded when the filename is created: %c = caseid %t = tape series number (0-5) %y = year (normally 4 digits, more digits if needed) %m = month %d = day %s = seconds into current day %% = % symbol For example, for a simulation with caseid="test" and current date of 0000/12/31 0:00UT, the monthly average files with a filename specifier of "%c.cam2.h%t.%y-%m.nc" expand into "test.cam2.h0.0000-12.nc", daily files with a filename specifier of "%c.cam2.h%t.%y-%m-%d-%s.nc" expand to ""test.cam2.h0.0000-12-31-00000.nc". Spaces are not allowed in filename specifiers. Although the character "/" is allowed in the specifier, it will be interpreted as a directory name and the corresponding directories will have to be created in the model execution directory (directory given to configure with -cam_exedir option) before model execution.
`ICE_CONSCHK_FRQ`	`Integer`	`0`		This is not used only when running as part of CCSM. If n 0, sea ice global energy checking will be done every n timesteps. If n 0, sea ice global energy checking will be done every n days.
`IDEAL_PHYS`	`Logical`	`false`		If true, Run ONLY the "idealized" dynamical core of the model (dynamics + Held&Suarez-specified physics). Only one of ADIABATIC, IDEAL_PHYS, or AQUA_PLANET can be true.
`INDIRECT`	`Logical`	false		If true, include the indirect radiative effects of sulfate aerosols.
`INITHIST`	`Char*8`	YEARLY		Frequency that initial files will be output: 6-hourly, daily, monthly, yearly, or never. Valid values: 'NONE', '6-HOURLY', 'DAILY', 'MONTHLY', 'YEARLY'
`IORD`	`Integer`	`4`		East-west transport scheme (used with Finite-Volume dynamical core only).
`IRADAE`	`Integer`	`-12`		Frequency of absorptivity/emissivity calculations in time steps (if positive) or model hours (if negative). To avoid having the abs/ems values saved on the restart output, this variable should divide evenly into `MFILT(1)*NHTFRQ(1)`.
`IRADLW`	`Integer`	`-1`		Frequency of long-wave radiation calculation in timesteps (if positive) or model hours (if negative).
`IRADSW`	`Integer`	`-1`		Frequency of short-wave radiation calculation in timesteps (if positive) or model hours (if negative).
`ISCCPDATA`	`Char*256`	See Desc.		Full pathname of time-invariant dataset used by the ISCCP cloud simulator. Default is set in DefaultCAMEXPNamelist.xml.
`ITSST`	`Integer`	`1`		Frequency of SST update in timesteps.
`IYEAR_AD`	`Integer`	1950	,	Year (AD) used to compute earth's orbital parameters. If not set, then use the values from the eccen, mvelp, and obliq namelist parameters. If only `IYEAR_AD` is set, orbital parameters will be computed automatically (based on Berger, 1977). If one of `OBLIQ, ECCEN, OR MVELP` is set, all three must be set. If all four of the above are set by the user, `IYEAR_AD` takes precedence. Setting is Required unless ECCEN, OBLIQ and MVELP are set. Not used when running as part of CCSM.
`JORD`	`Integer`	`4`		North-south transport scheme (used with Finite-Volume dynamical core only).
`KMXHDC`	`Integer`	`5`		Number of levels over which to apply Courant limiter, starting at top of model.
`KORD`	`Integer`	`4`		Vertical mapping (used with Finite-Volume dynamical core only).
`LINEBUF`	`Logical`	`.FALSE.`		If true, force buffer flush of stdout with each new-line generated (useful for debugging).
`MFILT(6)`	`Integer`	`30, 30, 30, ...`	, ,	Array of number of time samples to write to each history files series (a time sample is the history output from a given timestep).
`MODCOMM_GEOPK`	`Integer`	0		mod_comm geopk method (varies with mpi/mpi2 choice) (used with Finite-Volume dynamical core only).
`MODCOMM_TRANSPOSE`	`Integer`	0		mod_comm transpose method (varies with mpi/mpi2 choice) (used with Finite-Volume dynamical core only).
`MSS_IRT`	`Integer`	`365`	, , ,	Retention period in days for history and restart files stored on NCAR Mass Store. If `MSS_IRT=0`, no history or restart files will be archived.
`MSS_WPASS`	`Char*8`	None	,	NCAR Mass Store write password for all output datasets. Must remain the same throughout a case run, or a continuation run will not update original history files.
`MVELP`	`Real`	None		Earth's moving vernal equinox at perihelion (degrees: 0. to 360.0). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.
`N2OVMR`	`Real`	`0.311e-6`		N $_{2}$ O volume mixing ratio.
`NCDATA`	`Char*256`	See Desc.	,	Full pathname of initial atmospheric state dataset (NetCDF format). See Section 2.5.1 for details. Default is set in DefaultCAMEXPNamelist.xml.
`NDENS(6)`	`Integer`	`2, 2, 2, ...`	, ,	Array specifying output format for each history file series. Valid values are 1 or 2. "1" implies output to be written out in 64-bit NetCDF format, and "2" writes data out in 32-bit NetCDF format.
`NELAPSE`	`Integer`	None		Elapsed time to run. In time steps (positive) or days (negative) to run. May be entered instead of `NESTEP` or `STOP_YMD` and `STOP_TOD`. Note, `NESTEP` is not required or used when running as part of CCSM. Setting is Required if `NESTEP` or `STOP_YMD` not set.
`NESTEP`	`Integer`	None		Ending timestep. If positive the ending absolute timestep (from the start of the initial run). If negative the ending absolute number of days to process (from the start of the initial run). Either `NELAPSE`, `NESTEP` or (`STOP_YMD,STOP_TOD`) must be set if not running through flux coupler. (`STOP_YMD,STOP_TOD`) take precedence if set. Note, `NESTEP` is not required or used when running as part of CCSM. Setting is Required if `NELAPSE` and `STOP_YMD` not set.
`NHSTPR(6)`	`Real`	`8, 8, 8, ...`		Default history buffer precision (8 or 4 bytes) for each history file.
`NHTFRQ(6)`	`Integer`	`0, -24, -24, -24, ...`	, ,	Array of write frequencies for each history files series. If `NHTFRQ(1)=0`, the file will be a monthly average. Only the first file series may be a monthly average. If `NHTFRQ(i)0`, frequency is input as number of timesteps. If `NHTFRQ(i)0`, frequency is input as number of hours. Note that NHTRFQ(1) also controls the frequency of restart dataset writes if NREFRQ = 1.
`NLVDRY`	`Integer`	`3`		Number of layers from the top of the model over which to do dry convective adjustment. Must be less than `plev` (the number of vertical levels).
`NPR_YZ`	`Integer`	`0, 0, 0, 0`		YZ and XY decompositions (used with Finite-Volume dynamical core only).
`NREFRQ`	`Integer`	`1`		Controls whether restart datasets are written. This variable can only be 1 or 0. If 1, restart files are written and archived for every archive of the first history file series. If this variable is 0, then no restarts are written.
`NREVSN`	`Char*256`	None		Full pathname of master restart file from which to branch. Setting is Required for branch run.
`NSPLIT`	`Integer`	0		Lagrangian time splits when using Finite-Volume dynamics. If zero, a best-estimate will be automatically calculated.
`NSREST`	`Integer`	`0`	, ,	Run type: 0=initial , 1=restart , 3=branch
`NUSR_ADV`	`Integer`	`0`		number of user defined advected tracers
`NUSR_NAD`	`Integer`	`0`		number of user defined non-advected tracers
`OBLIQ`	`Real`	None		Earth's orbital angle of obliquity (degrees: -90. to +90., typically 22. to 26.). Setting is Required if IYEAR_AD not set. Not used when running as part of CCSM.
`OMPNEST`	`Integer`	0		Option for nested openmp (used with Finite-Volume dynamical core only).
`OZNCYC`	`Logical`	`.TRUE.`		Flag for yearly cycling of ozone data. If set to `.FALSE.`, a multi-year dataset is assumed, otherwise a single-year dataset is assumed, and ozone will be cycled over the first 12 values in the file.
`PERPETUAL_RUN`	`Logical`	`false`		Set to .true. to specify that the run will use a perpetual calendar. If perpetual_ymd is not set then the perpetual date will be read from the initial file.
`PERPETUAL_YMD`	`Logical`	`false`		Perpetual date specified as (year1000 + month100 + day). This date overrides the date from the initial file. If aqua_planet=.true. then perpetual_ymd is ignored and the perpetual date is set to 321.
`PERTLIM`	`Real`	0.0		Perturb the initial conditions for temperature randomly by up to the given amount. Only applied for initial simulations.
`PHYS_ALLTOALL`	`Integer`	`0`		Dynamics/physics transpose option.
`PHYS_CHNK_PER_THD`	`Integer`	`1`		Select target number of chunks per thread. Must be positive
`PHYS_LOADBALANCE`	`Integer`	`0`		Select different options for organization of physics chunks. Each uses a different scheme for static load balancing.
`PRECC_THRESH`	`Real`	`0.1 mm/hr`		Precipitation threshhold for use with the PRECCINT and PRECCFRQ fields for history files.
`PRECL_THRESH`	`Real`	`0.05 mm/hr`		Precipitation threshhold for use with the PRECLINT and PRECLFRQ fields for history files.
`PRESCRIBED_SULFUR`	`char*16`	`direct`		Control radiative interaction of prescribed sulfur. May be set to "passive" or "direct". passive = prescribed sulfur has no radiative interaction direct = prescribed sulfur drives radiative interaction
`PRINT_STEP_COST`	`Logical`	`.FALSE.`		If true, print CPU timing per model timestep.
`PROGNOSTIC_ICESNOW`	`Logical`	`.TRUE.`		Accumulate snow over sea-ice (with a 0.5m maximum). If `.FALSE.` then use a climatology for snow depth.
`PROGNOSTIC_SULFUR`	`char*16`	`off`		Control prognostic sulfur calculations. May be set to "off", "passive", or "direct". off = no prognostic sulfur (default) passive = prognostic sulfur computed with no radiative interaction direct = prognostic sulfur computed and drives radiative interaction
`RADFORCE`	`Logical`	`false`		Compute forcing from aerosols
`RAMPYEAR_GHG`	`integer`	`0`		Ramped gases fixed at this year if set to a value greater than zero. Only used if SCENARIO_GHG is set to RAMPED.
`RAMPYEAR_PRESCRIBED_SULFUR`	`integer`	`none`		This variable is reserved for future use. No value is permitted.
`RAMPYEAR_PROGNOSTIC_SULFUR`	`integer`	`none`		Set to YYYY in order to cycle that year of sox emissions.
`RAMPYEAR_SCON`	`integer`	`0`		Ramped scon fixed at this year if set to a value greater than zero. Only used if SCENARIO_SCON is set to RAMPED.
`RAMP_CO2_ANNUAL_RATE`	`real`	`1.0`		percentage amount of co2 ramping per year
`RAMP_CO2_CAP`	`real`	`See Desc.`		co2 cap if rate 0, floor otherwise; specified as multiple or fraction of inital value; e.g. setting to 4.0 will cap at 4x initial co2 setting; default is boundless if rate 0, zero otherwise
`RAMP_CO2_START_YMD`	`integer`	`0`		date on which ramping of co2 begins; REQUIRED to be set for scenario_ghg='RAMP_CO2_ONLY'
`READTRACE`	`Logical`	`.TRUE.`		If true, initialize data for all consituents found on the initial conditions dataset. Otherwise data will be initialized using internally-specified default values.
`REF_TOD`	`Integer`	See Desc.		Reference time-of-day (seconds). Default is to use starting time of day
`REF_YMD`	`Integer`			Reference date for run as `yyyymmdd`. Default is to use starting date. The reference date is the reference for the time variable output on the history files.
`RESET_CSIM_ICE_PROPS`	`Logical`	`.FALSE.`		Reset the CSIM ice-model properties. Snow-cover is set to zero, and ice-temperatures are all set to freezing. This is important when starting from an initial dataset that isn't in equilibrium. This is used, for example, when starting from initial conditions that are interpolated from a different resolution.
`REST_PFILE`	`Char*256`	See Desc.		Full pathname of restart pointer file. Default is $HOME/ cam2.CASEID.rpointer
`SCENARIO_CARBON_SCALE`	`char*16`	`FIXED`		Controls carbon scaling. May be set to 'FIXED' or 'RAMPED'. FIXED means use the value specified by CARSCL. RAMPED means use data from file specified by BNDTVCARBONSCALE.
`SCENARIO_GHG`	`char*16`	`FIXED`		Controls treatment of specified co2,ch4,n2o,cfcf11,cfc12 volume mixing ratios. May be set to 'FIXED' or 'RAMPED' or 'RAMP_CO2_ONLY'. FIXED = volume mixing ratios are fixed and have either default or namelist input values RAMPED = volume mixing ratios are ramped RAMP_CO2_ONLY = only co2 mixing ratios are ramped
`SCENARIO_PRESCRIBED_SULFUR`	`char*16`	`FIXED`		Controls prescribed sulfur amounts. Can only be set to 'FIXED'! FIXED = uses climatology
`SCENARIO_PROGNOSTIC_SULFUR`	`char*16`	`RAMPED`		Sets so2 and so4 surface fluxes. May only be set to 'RAMPED'! RAMPED = uses boundary data set bndtvsox. Only used if PROGNOSTIC_SULFUR is set to PASSIVE or DIRECT.
`SCENARIO_SCON`	`char*16`	`FIXED`		Controls the solar constant. Can be set to 'FIXED' or 'RAMPED'. FIXED = scon is fixed and can have either the default or namelist value. RAMPED = scon is ramped.
`SCON`	`Real`	`1.367E6`		Solar constant (CGS)
`SOIL_EROD`	`Char*256`	See Desc.		Full pathname of time-variant boundary dataset for soil erodibility factors. Default is set in DefaultCAMEXPNamelist.xml.
`SOM_CONSCHK_FRQ`	`Integer`	`0`		This is used only when running with the slab ocean model. If n 0, SOM global energy checking will be done every n timesteps. If n 0, SOM global energy checking will be done every n days.
`SSLTSCL_RF`	`Real`	`0`		Set sea salt aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when `RADFORCE` is true.
`SSLTSCL`	`Real`	`1.0`		Set sea salt aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.
`SSTCYC`	`Logical`	`.TRUE.`		Flag for yearly cycling of SST data. If set to `.FALSE.`, a multi-year dataset is assumed, otherwise a single-year dataset is assumed, and SSTs will be cycled over the first 12 values in the file. Not used if running with CCSM.
`START_TOD`	`Integer`	See Desc.		Starting time-of-day (seconds). Default is to use time of day from initial condition dataset. If not input, value is set to `NCSEC` from initial dataset header.
`START_YMD`	`Integer`	See Desc.		Starting date for run as `yyyymmdd`. Default is to Use date from initial condition dataset. If not input, value is set to `NCDATE` from initial dataset header.
`STOP_TOD`	`Integer`	`0`		Stopping time of day for run in seconds since 0Z. Not used when running through flux coupler.
`STOP_YMD`	`Integer`	None		Stopping date for run encoded in yearmmdd format. Either `NELAPSE`, `NESTEP` or `STOP_YMD (and possibly STOP_TOD`) must be set if not running through flux coupler. (`STOP_YMD,STOP_TOD`) takes precedence if set. `STOP_YMD` is not required or used when running as part of CCSM. Setting is Required if `NELAPSE` and `NESTEP` not set.
`STRAT_VOLCANIC`	`Logical`	`false`		Use stratospheric volcanic aerosols masses and couple with radiative forcing computations.
`SULSCL_RF`	`Real`	`0`		Set sulfur aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when `RADFORCE` is true.
`SULSCL`	`Real`	`1.0`		Set sulfur aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.
`SWAP_COMM_ORDER`	`Integer`	0		Performance tuning option for swap communication. (only used with EUL and SLD dycores).
`SWAP_COMM_PROTOCOL`	`Integer`	0		Performance tuning option for swap communication. (only used with EUL and SLD dycores).
`TAUBACK`	`Real`	`0.0`		Optical depth of (rh = 0.8, sulfate-like) background aerosol.
`TAUVIS`	`Real`	`0.14`		Visible optical depth.
`TRACERTRANS`	`Integer`	0		Number of simultaneously transposed tracers (used with Finite-Volume dynamical core only).
`TRACE_GAS`	`Logical`	`false`		If true, turn on prognostic greenhouse gas calculations for CH4, N2O, CFC11 and CFC12. This requires adding the option ``-nadv 7'' when running `configuration`.
`USE_ETA`	`Logical`	`.FALSE.`		If TRUE, use the vertical coordinate (eta) values defined in the finite volume dynamical core code rather than the values defined on the input dataset (used with Finite-Volume dynamical core only).
`VOLCSCL_RF`	`Real`	`0`		Set volcanic aerosol scaling factor for radiative forcing calculation. This does not affect mmr's used for the climate integration, and is only used when `RADFORCE` is true.
`VOLCSCL`	`Real`	`1.0`		Set volcanic aerosol scaling factor for radiative transfer calculations. This may be used to scale the specified or prognostic aerosol mass mixing ratios.

Next: C. CLM namelist variables Up: B. CAM Namelist Variables Previous: B.12 CAMEXP orbital parameter Contents

Jim McCaa 2004-10-22