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2.4.5 Example 5 -- Branch Run
In the following example, a new case is begun by "branching" from a CCM3
control run. The branch run allows the user to change any namelist variables
associated with the history files, while continuing from a chosen
point in a previous run. Other namelist variables should not be modified.
A branch run must always start a new case, so the namelist variable CASEID
must be changed. In this example, some fields are excluded from
the primary history file, and placed on two auxiliary history files, to
be written every 18 timesteps. Note the use of NSREST=3 for a
branch run, and the additional values assigned to NDENS, MFILT,
and NHTFRQ for the auxiliary file.
CASEID = 'run05'
CTITLE = 'CCM3 branch run'
NCDATA = 'SEP1.T42.0198.nc'
BNDTVS = 'T42M5079.nc'
BNDTVO = 'ozn.0596.r8.nc'
NSREST = 3
NSWRPS = 'mypass'
IRT = 365
RIRT = 365
NREVSN = '/USERNAME/run01/ccm3/rest/ccmr_00000902_00000'
NHTFRQ = 72,18,18
NDENS = 2,2,2
MFILT = 10,30,30
NNBDAT = 000901
NNBSEC = 0
NNDBAS = 0
NNSBAS = 0
NELAPSE = -30
NINAVG = 'A','X','M'
AUXF = '1','PRECL','PRECC','CLOUD',
EXCLUDE = 'PRECL','PRECC','CLOUD'
IYEAR_AD = 1950
nrevsn = 'lsmr_00000902_00000'
A branch run must always start a new case.
NSREST=3 indicates a "branch" run, which starts from a specific
set of restart datasets and creates a new case.
This run uses master restart file ccmr_00000902_00000 from example
1 to provide the initial dataset for starting this case. USERNAME
in this example refers to the users logid. A branch run also requires
that NREVSN be set for the lsm, again we use the lsm restart file
written by example 1.
History file write frequency will be every 72 timesteps (1 day) for the
primary file, and every 18 timesteps (6 hours) for the two auxiliary files.
All primary and auxiliary history files will be packed 2 to 1.
10 time samples will be written to each primary history file. 30 time samples
will be written to each auxiliary history file.
NINAVG = 'A','X','M' specifies the field type in each history file.
The primary history file will be averaged (daily averaged since NHTFRQ(1)=72).
Fields on the first auxiliary history file will contain the maximum values
of the PRECL, PRECC and CLOUD fields for the
past 6 hours (18 timesteps), and fields on the second auxiliary history
file will contain the minimum values of the same fields for the past 6
This list specifies that two auxiliary history files will be written containing
the fields shown. Up to five such files may be declared.
To save file storage space, the fields that will be written to the auxiliary
history files above are excluded from the primary history file.
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$Name: ccm3_6_6_latest3 $ $Revision: 18.104.22.168 $ $Date: 1999/03/25 21:37:59 $ $Author: erik $