CESM Models

CCSM3.0 Public Release

CCSM version 3.0 was released to the public in June 2004. This web page deals specifically with the CCSM3.0 release.

The Community Climate System Model (CCSM) is a coupled climate model for simulating the earth's climate system. Composed of four separate models simultaneously simulating the earth's atmosphere, ocean, land surface and sea-ice, and one central coupler component, the CCSM allows researchers to conduct fundamental research into the earth's past, present and future climate states.

Contents

• CCSM3.0 Model Documentation, tutorials, FAQs
• CCSM3.0 Model Source Code, patches, bug reports
• CCSM3.0 Model Input Data
• CCSM3.0 Model Output Data
• Links to information about uncoupled CAM and CLM

Model Documentation

Running The Complete Coupled System

• CCSM3.0 User's Guide [html] [pdf]
• Frequently Asked Questions about CCSM3.0
• Slide presentation from the July 2004 CCSM3.0 Scripts Tutorial (700K pdf).
• An Introduction to Load Balancing CCSM3 Components presented at the June 2005 CCSM workshop [pdf]
• Online Bulletin Board for CCSM bug reports & questions

Atmosphere Models

• Community Atmosphere Model (cam3)
• Climatological Data Model (datm6)
• Observational Data Model (latm6)

Ice Models

• Community Sea Ice Model (csim5)
• Climatological Data Model (dice6)

Land Models

• Community Land Model (clm3)
• Climatological Data Model (dlnd6)

Ocean Models

• CCSM POP (pop)
• Climatological Data Model (docn6)

Coupler

• The Coupler (cpl6)

Model Source Code

• CCSM3.0 source code (23 June 2004) -- This is the original 3.0 software release.
  This source code is disseminated via the Earth System Grid (ESG). A short registration is required.
  All CCSM3 source code is subject to the following Copyright Notice and Disclaimer.
  The code is a 7.2MB gzip'd tar file. Once un-zip'd and un-tar'd, the source code is about 34MB.
  To unzip, "gunzip ccsm3_0.tar.gz". To untar, "tar -xvf ccsm3_0.tar".
• CCSM3.0.1 beta14 source code (22 March 2006) -- This is an incremental upgrade to the original release.
  What is ccsm3.0.1 beta14?
  This source code is disseminated via the Earth System Grid (ESG). A short registration is required.
  All CCSM3 source code is subject to the following Copyright Notice and Disclaimer.
  The code is a 7.5MB gzip'd tar file. Once un-zip'd and un-tar'd, the source code is about 30MB.
  To unzip, "gunzip ccsm3_0_1_beta14.tar.gz". To untar, "tar -xvf ccsm3_0_1_beta14.tar".
• Reporting a Problem
  If you have any problems, additional questions, bug reports, or any other feedback, please use the CCSM Help Bulletin Board .
• CCSM3.0 Mailing List
  To subscribe to the ccsm-users mailing list follow the link, or email your request to ccsm @ ucar.edu. This is a low-volume mailing list that allows the community to stay up to date with new releases, important bugs, and development procedures.

Model Input Data

The input data needed to run the model is disseminated via the Earth System Grid (ESG).

The data necessary to run these all-active configurations is currently available:

• non-IPCC constant 1990 control runs
• non-IPCC increasing CO2 scenarios
• IPCC constant 1870 control runs

Additional input data is necessary for the following IPCC scenarios (registration with ESG is required):

• IPCC constant 2000 control runs
• IPCC 20th-century scenarios
• IPCC future scenarios

Model Output Data

A variety of mmulti-century CCSM3.0 control runs have been carried out at three resolutions: T31_gx3v5, T42_gx1v3, and T85_gx1v3. Monthly average data from all components were saved and some post-processed time series are available. A description of the various CCSM3 control runs is available in the Experiments and Output Data section of this web site.

CCSM3 output data is disseminated via the Earth System Grid (ESG).

Related Stand-Alone Components: Uncoupled Models

Version	Description
Atmosphere [CAM]	The Community Atmosphere Model (CAM) is the latest in a series of global atmosphere models developed at NCAR for the weather and climate research communities. While a version CAM serves as an atmospheric component in the CCSM framework (a coupled system), this is an alternate version that runs as a "stand alone" (uncoupled) model.
Sea Ice [CSIM]	The Community Sea Ice Model (CSIM) serves as the sea ice component of CCSM. It is the result of a community effort to develop a portable, efficient sea ice model that can be run coupled in a global climate model or uncoupled as a stand-alone ice model. It is a dynamic-thermodynamic model that includes a subgrid-scale ice thickness distribution, energy conserving thermodynamics, and elastic-viscous-plastic (EVP) dynamics.
Land [CLM]	The Community Land Model (CLM) is a state-of-the-art soil-vegetation-atmosphere transfer model developed by the CCSM's Land Model Working Group. Given land surface and atmospheric inputs from datasets and models, the CLM calculates (at the land-atmosphere interface) heat and radiation fluxes, temperature, humidity, and moisture values, river flow, volatile organic compound emissions, and CO2 fluxes. The CLM includes a dynamic global vegetation model that simulates plant structure and distribution as a function of the climate.
Ocean [POP]	The CCSM version of the Parallel Ocean Program was released in June 2004 as part of the CCSM3.0 release.