A current version of the code is V2.9.3, released 8 July 2007. V2.9 version provided a major upgrade to the makefile that will significantly streamline and ease its use. See here for more details.

GROGRAT is a four-dimensional ray-tracing algorithm which can accurately trace nonhydrostatic gravity waves through any gridded numerical representation of the Earth's neutral atmosphere. The first version (V1.0) of this model was described by Marks and Eckermann (1995). Recent updates of the code and results of some test experiments with newer versions of the code have been reported recently by Eckermann and Marks (1997). 

New features from version 1.0 include updated infra-red radiative damping parameterizations, full 4D interpolation of background fields, provision for a background vertical velocity field, automatic internal conversion of fields from pressure or log-pressure gridding to geometrical height grids, refraction due to time-varying flow fields, interfaces of the FORTRAN code for C and IDL applications, and accommodation of either forward (upwards) or backward (downwards) ray-tracing experiments.

Further Information is Available Under the Following Headings:

What are Gravity Waves, and Why Model Them Using GROGRAT?

Some Sample Results from GROGRAT

Code and Installation Details

Conditions of Use

Future Developments

Publications

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