Gigatraj is a software library, plus some sample programs, for calculating the trajectories of air parcels in the lower stratosphere. Its purpose is purely for scientific research. It allows for several different sources of meteorological data, and it can calculate either kinematic (in pressure coordinates using omega) or quasi-isentropic (in potential temperature coordinates using heating rates) trajectories.
Please note that gigatraj is not a general Lagrangian transport model. It does not attempt to simulate the effects of turbulence or small-scale diffusion. This makes it unsuitable for use in regions where those effects are important--for example, at low altitudes.
Only source code is available here; we do not offer pre-compiled binaries. Gigatraj is written in C++, and it is known to compile with the GNU g++ compiler on several different Linux distributions.
To run gigatraj usefully, you will also need several external libraries, which are not included here. You should have the netcdf v4 libraries installed, with support for accessing OPeNDAP servers. And if you want to use parallel processing, then you should have the openMPI library installed as well. Although gigatraj is written in C++, it uses only the C language bindings of those two libraries.
Gigatraj is written by Leslie Robert Lait, NASA ARC-SG, working in the Atmospheric Chemistry and Dynamics Laboratory of NASA's Goddard Space Flight Center.
For questions, contact [email protected].
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