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Gri is free software covered by the GNU copyleft (GPL version 2). It is available in source form and compiles without modification on Red Hat, Debian and most likely other Linux distributions, as well as on Solaris, AIX and other UNIX platforms. Most users won't want to compile Gri, however, and won't need to. Gri is available in prepackaged form for the Debian GNU/Linux system (see http://packages.debian.org/gri/ for a list of up-to-date packages for Gri and its documentation). It is also available as an RPM, packaged by the first author of this article, and has been submitted to Red Hat for distribution in Powertools, post version 6.2 (see http://www.redhat.com/). Please feel free to visit ftp://ftp.phys.ocean.dal.ca/users/kelley/gri/ for unofficial Debian and Red Hat packages, along with a tar-based version for other platforms.
Gri comes with extensive documentation. The manual comes in a PostScript version suitable for printing (weighing in at 240 pages), an Info version and an HTML version. The HTML version is accessible on-line at http://www.phys.ocean.dal.ca/~kelley/gri/.
Real-world examples can be seen in the Gri cookbook at http://www.phys.ocean.dal.ca/~kelley/gri/cookbook/.
In addition, there is an e-mail-based newsgroup for Gri, moderated by the first author of this article. You may join by sending a message to majordomo@phys.ocean.dal.ca, with the contents consisting of the single line ``subscribe gri''.
``Application of Barnes objective analysis scheme, Part I: effects of undersampling, wave position, and station randomness'', S. L. Barnes, 1994, Journal of Atmospheric and Oceanic Technology, 11, 109-116.
``A basin-wide estimate of vertical mixing in the upper pycnocline: spreading of bomb tritium in the North Pacific Ocean'', D. E. Kelly and K. A. Van Scoy, 1999, Journal of Physical Oceanography, 29, 1759-1771.
``Identifying overturns in CTD profiles'', P. S. Galbraith and D. E. Kelley, 1996, Journal of Atmospheric and Oceanic Technology, 13, 688-702.