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Registration is free and open to the general public. Nearly all of the datasets are free to all registered users; a few are restricted to certain users (e.g. university researchers). In addition, the catalog shows data sets available in these categories: atmospheric, oceanographic, geophysical, hydrology, gridded analysis and MM5 model input data.
The data is available for free download from the NOAA Earth System Research Laboratory [1] and NCEP. [2] It is distributed in Netcdf and GRIB files, for which a number of tools and libraries exist. It is available for download through the NCAR CISL Research Data Archive on the NCEP/NCAR Reanalysis main data page. [3]
To address a growing need for remote access to high volume numerical weather prediction and global climate models and data, the National Climatic Data Center (NCDC), along with the National Centers for Environmental Prediction (NCEP) and the Geophysical Fluid Dynamics Laboratory (GFDL), initiated the NOAA Operational Model Archive and Distribution System (NOMADS) project.
Then, the model takes these guesses, and with the help of some surface observations, can create an objective analysis, using LITTLE_R. [8] RAWINS is an older version of LITTLE_R and thus LITTLE_R is more commonly used. Then INTERPF takes that data from RAWINS/LITTLE_R and REGRID to interpolate that data to the sigma coordinate explained above. [7]
EOL manages and operates NCAR's lower atmosphere observing systems, including ground-based instrumentation and two research aircraft, on behalf of the NSF. High Altitude Observatory (HAO)—The oldest part of NCAR, HAO is NCAR's solar-terrestrial physics laboratory. Research foci are the Sun and the Earth's upper atmosphere.
The Advanced Research WRF (ARW) is supported to the community by the NCAR Mesoscale and Microscale Meteorology Laboratory. [6] The WRF-NMM solver variant was based on the Eta model, and later nonhydrostatic mesoscale model, developed at NCEP. The WRF-NMM (NMM) is supported to the community by the Developmental Testbed Center (DTC).
The Community Atmosphere Model (CAM) can also be run as a standalone atmosphere model. Its most current version is 3.1, while 3.0 was the fifth generation. On May 17, 2002, its name was changed from the NCAR Community Climate Model to reflect its role in the new system. [8]
Not all reanalysis data are constrained by observation: some data types, such as precipitation (depending on the reanalysis) and surface evapotranspiration (for which global observations simply do not exist), are obtained by running (presumably newer) general circulation or NWP models. Reanalyses are known not to conserve moisture.