Abstract: CCSM coupled model is based on a framework which divides the complete climate system into component models connected by a coupler. This design requires four component models -- atmosphere, sea-ice, land, and ocean -- each connected to the Coupler, and each exchanging data with the Coupler only.
The latm6 Observational Data Atmosphere Model functions as the atmosphere component in a CCSM ... configuration. The latm6 atmosphere component interacts with the Coupler just like any atmosphere model would, but it is not an active model, rather, it takes atmosphere data from input data files and sends it to the Coupler, ignoring any forcing data received from the Coupler. Typically the input data files contain climatological or time averaged observational data, although some data fabrication is usually necessary as it's unlikely that real world observations exists for all the required fields. Such a "dummy" atmosphere model is useful for doing ocean + ice spinup runs.
This latm code is a variant of the datm code, the difference being that the datm cycles thru daily average data fields normally created by the CCSM active atmosphere component (CCM, now called CAM), while the latm6 cycles thru data from other sources (for example NCEP). The latm cycles thru separate data file streams for atmospheric states, precipitation, and radiation. Further, these three data streams can have different sampling intervals, for example, radiation data can be daily average data while precipitation data is monthly average data.
The CCSM Observational Data Atmosphere Model, version 6.0 (latm6), was released in June 2004, as part of the CCSM3.0 release.
The CCSM3.0 coupled model, released in June, 2004, provides the community with a coupled model framework for carrying out climate simulations. Upgrades from CCSM2.0.1 release can be found in the Introduction section of the Users Guide CCSM coupled model is based on a framework which divides the complete climate system into component models connected by a coupler. This design requires four component models -- atmosphere, land, ocean, and sea-ice -- each connected to the coupler, and each exchanging data with the coupler only. From a software engineering point of view, the CCSM is not a particular climate model, but a framework for building and testing various climate models for various applications. In this sense, more than any particular component model, the coupler defines the high-level design of CCSM software.