Once there, you must follow the download link and accept the CAM distribution license.
At the least you must download the ``CAM 3.0 Source distribution'', the ``Resolution-independent datasets'', and the dataset tarball for at least one resolution.
To untar the source code tar file you execute the following command:
gunzip -c cam3.0_source_code.tar.gz | tar xvf -
To untar one or more dataset tarfiles you must first go a directory
that will be the dataset root directory. For all of the examples in
this document it will be assumed that the environment variable CSMDATA
will be set to the full pathname of this directory. You can achieve
this in an interactive shell by typing the following command while in
the dataset root directory:
setenv CSMDATA `pwd`
Now unpack each of the dataset tar files using:
gunzip -c <tarfilename> | tar xvf -
Note: All dataset tarfiles should be unpacked in the same directory.
The directory structure of the input datasets is as follows:
| Directory name | Synopsis |
|---|---|
| inputdata | Top level directory where CSMDATA points to |
| inputdata/atm | Datasets for atmosphereic models |
| inputdata/atm/cam2 | Datasets specifically for CAM |
| inputdata/atm/cam2/ggas | Greenhouse gas forcing datasets |
| inputdata/atm/cam2/inic | Atmosphereic initial condition datasets |
| inputdata/atm/cam2/ozone | Ozone datasets |
| inputdata/atm/cam2/rad | Radiation datasets |
| inputdata/atm/cam2/scam | Single column model datasets |
| inputdata/atm/cam2/scyc | Sulfate forcing datasets |
| inputdata/atm/cam2/sst | Sea Surface temperature datasets |
| inputdata/lnd | Datasets for land models |
| inputdata/lnd/clm2 | Datasets for CLM |
| inputdata/lnd/clm2/pftdata | Plant physiology datasets |
| inputdata/lnd/clm2/rawdata | High resolution surface datasets |
| inputdata/lnd/clm2/srfdata/cam | Time-invariant surface datasets |
| inputdata/lnd/clm2/inidata_2.1/cam | Land-model initial condition datasets |
The directory hierarchy for CAM 3.0 is as follows. The directory hierarchy closely parallels the directory hierarchy for CCSM3 and as such seperates code out by model component.
| Directory name | Synopsis |
|---|---|
| models/atm/cam/bld/ | Scripts to build and execute the model |
| models/atm/cam/src/ | Atmosphere model main source code directory |
| models/atm/cam/src/advection/slt | Semi-Lagrangian Transport advection routines |
| models/atm/cam/src/control | Control code |
| models/atm/cam/src/dynamics/eul | Eulerian dynamics |
| models/atm/cam/src/dynamics/fv | Finite-Volume dynamics |
| models/atm/cam/src/dynamics/sld | Semi-Lagrangian dynamics |
| models/atm/cam/src/ocnsice/dom | Data Ocean Model |
| models/atm/cam/src/ocnsice/som | Slab Ocean Model |
| models/atm/cam/src/physics/cam1 | Physics routines (e.g., radiation, convection) |
| models/atm/cam/src/utils | CAM specific utilities |
| models/atm/cam/tools/ | Directory of tools (such as history compare routines) |
| models/atm/cam/tools/cprnc | History file comparison program. Normally used to compare code modifications to a "base-line" code. Prints out summary of differences. |
| models/atm/cam/tools/scam | Single column model |
| models/csm_share/shr | Code shared by all the geophysical model components of the Community Climate System Model (CCSM) (e.g. code for CCSM message passing and orbital calculations) |
| models/lnd/clm2 | Community Land Model (CLM2.1) code |
| models/ice/csim4 | Community Sea-Ice Model (CSIM4) code |
| models/utils | Independent utility codes |
| models/utils/esmf | General purpose Earth System Modeling Framework (ESMF) utilities. |
| models/utils/pilgrim | Parallel Library for Grid Manipulations. |
| models/utils/timing | General purpose timing library |