What is the CRM? | / NCAR / CGD / CMS / CCM3 / | [ CCM3 ] [ Processor ] [ LSM ] [ CSM ] |
What is the CRM? CRM News Download CRM software FAQ README INSTALL ChangeLog Version Info Known Problems The Column Radiation Model, or CRM, is a standalone version of the radiation model used in the NCAR Community Climate Model (CCM). The CRM is composed of the actual subroutines from the CCM which have been modified as little as possible in order to run in a standalone mode. The CRM is freely available (see below) and is a useful tool for scientific studies of the Earth's solar and infrared energy budgets, greenhouse gas and aerosol radiative forcing, and column closure experiments. We would like to begin assembling a list of references to papers which employed the CRM. Please send us your references!
2005/12/15: Updated location for CRM Online. I should also mention, since I do not update this page very often, that I occasionally do update the Makefile to maintain compatibility with new compiler switches, etc. So the code has not been completely frozen since 2000. In fact, I added eight new diagnostic output fields in 2001. However, I have stopped updating the CRM version number. If this bothers you, let me know and I will revert to making tradiational, numbered releases.
2000/02/25: CRM 2.1.2 is released. This fixes inconsistencies in mls_clr.out and mls_cld.out accidentally introduced in CRM 2.1.1. These sample output files should once again agree (to roundoff) with files produced by the CRM as built from scratch.
2000/01/04: CRM 2.1.1 is released. CRM 2.1.1 is a bugfix release. This version fixes a bug introduced in 2.1.0 in which the diagnostic arrays containing the vertical profile of the LW fluxes (variables flx_LW_dwn, flx_LW_up and flx_LW_net) were not always initialized correctly. On some machine/compiler combinations, this bug caused incorrect answers in these arrays (especially if the CRM was compiled with PLON > 1). Single level fields (e.g., flnt, flntc, flns, flds, flus) were not affected by this bug. Thanks to Mike Iacono for reporting the bug and supplying the patch. Users of Solaris f90 and Solaris f77 should read the Known Problems before deciding whether to upgrade.
There is now a WWW front end to the CRM available on the Web. Professor Brian Fiedler of the School of Meteorology at the University of Oklahoma has created a simple point and click interface to the CRM called CRM Online. CRM Online allows interactive setting of tropospheric and stratospheric temperatures, CO2 mixing ratio, and specific humidity.
1999/09/07: CRM 2.1 is released. Version 2.1 includes archival of many more diagnostic quatities. New quantities which are now automatically archived include spectral optical depths, spectral fluxes, vertical profiles of SW and LW fluxes, and spectral albedos. In addition, the build mechanism has been simplified and generalized. There are no new physics and answers do not change so upgrading is not necessary. CRM 2.1 requires a decent Fortran 90 compiler to advantage of these new features.
Who should upgrade? User who would like access to vertical and spectral information previously unavailable in the CRM diagnostics should upgrade. Download sample text and netCDF output files from the CRM version 2.1 to see if you would benefit from upgrading. Users of Solaris f90 and Solaris f77 should read the Known Problems before deciding whether to upgrade.
1999/07/02: CRM 2.0.2 is released. Version 2.0.2 is a maintenance release. Changes include improved FAQ, build features, and more diagnostices in crm.nc. There are no new physics and answers do not change so upgrading is not necessary.
1998/08/28: CRM 2.0 is released. Version 2.0 is based on the newly released CCM 3.6, and implements all applicable CCM namelist parameters. Run-time specification of for these parameters (e.g., trace gas concentrations, orbital parameters, aerosol optical depth) is implemented via additional lines in the input files. The new input files are backwards compatible with older CRM input files. Many more diagnostics (e.g., optical depths, spectral albedos) are implemented. All users are urged to upgrade to CRM 2.0
1998/07/22: CRM 1.16 is released. Version 1.16 uses a new directory structure more similar to the CCM directory structure. There are no physics changes in CRM 1.16. The new directory structure is now under CVS control and this should facilitate maintainance of the CRM.
1998/07/10: CRM 1.15 is released. Version 1.15 fixes a bug introduced in the surface radiation budget (SRB) diagnostics of CRM 1.13 (released March, 1998). The direct/diffuse partitioning of fluxes in versions 1.13--1.14 of the CRM was incorrect. The total and spectral fluxes were not affected by this bug. See the ChangeLog for details. All users are urged to upgrade to CRM 1.15.
The distribution includes the complete CRM source code necessary to build and run the CRM on your own machine.
`FAQ' is a list of Frequently Asked Questions about the CRM. Please read this file before sending questions to the CRM maintainers.
`README' briefly describes the CCM3 CRM, links to further documentation, and contact information for further questions.
`INSTALL' contains the CCM3 CRM installation instructions.
`ChangeLog' contains the most up-to-date information on the latest CRM improvements. There is no need to install minor, unannounced upgrades to CRM unless a problem you are having with CRM is listed in `ChangeLog' as having been fixed in the latest revision.
You can easily tell whether you have the most recent version, and whether you should upgrade by reading the ChangeLog.
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