Go to the bottom of this page. See the search engine and sub-section links.
Go to next page Go to previous page Go to top of this section Go to top page Go to table of contents

Previous Section Headers

User's Guide to NCAR CCM3.6 Search Page


2. Using CCM3.6
    2.4 Example Namelists

2.4.4 Example 4 -- Paleo run

This is an initial run for a period of one day beginning on September 1, 4050 BC (6000 BP).  This namelist defines the earth's orbit, solar constant, and the volume mixing-ratio for the greenhouse gases. Normally these values are changed for a paleo-climate simulation.

 &CCMEXP
 CASEID = 'run04'
 CTITLE = 'Paleo-climate run: 4050 BC'
 NCDATA = 'SEP1.T42.0198.nc'
 BNDTVS = 'T42M5079.nc'
 BNDTVO = 'ozn.0596.r8.nc'
 IRT    =      0
 DTIME  =  1200.
 NSREST =      0
 NDENS  =      1
 NNBDAT = 000901
 NNBSEC =      0
 NNDBAS =      0
 NNSBAS =      0
 MFILT  =     20
 NESTEP =     72
 NHTFRQ =     72
 INCORBUF = .true.
 INCORHST = .true.
 INCORRAD = .true.
 ECCEN = 0.01868126
 OBLIQ = 24.10538
 MVELP = 0.87
 CO2VMR = 2.80e-4
 CH4VMR = 0.700e-6
 N2OVMR = 0.275e-6
 F11VMR = 0.
 F12VMR = 0.
 SCON = 1.363e6
 /
 &LSMEXP
 finidat = 'arbitrary initialization'
 /

ECCEN, OBLIQ, MVELP
Set the earth's orbital parameters for year 4050 BC.  For the most accuracy,  the parameters ECCEN, OBLIQ, and MVELP  should be set rather than calculating values by using IYEAR_AD.   When IYEAR_AD is specified, the other orbital namelist parameters are ignored. If you want to calculate the orbital parameters for 4050 BC using (Berger, 1977) replace the settings  for ECCEN, OBLIQ, and MVELP with.
 IYEAR_AD = -4050
CO2VMR,CH4VMR,N2OVMR,F11VMR,F12VMR
Set the volume mixing ratios for the greenhouse gases: CO2, CH4, N2O, CFC11, and CFC12. The values are set to values that might be reasonable for 4050 BC.
SCON
Set the solar constant to 1363 W/m2.
BNDTVO,BNDTVS
In this example these datasets would not be appropriate for a paleo run. In general, you will want to create your own datasets to provide these values.

 Go to the top of this page. See links to previous section headers.
Go to next page Go to previous page Go to top of this section Go to top page Go to table of contents

 Search for keywords in the CCM3.6 Users GuideSearch page

Questions on these pages can be sent to... erik@ucar.edu .

$Name: ccm3_6_6_latest3 $ $Revision: 1.38.2.1 $ $Date: 1999/03/25 21:37:58 $ $Author: erik $