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  Fortran 90


The Unified Model was originally written in the Fortran 77 programming language with some low level routines written in C to aid portability. Now however, Fortran 90 is increasingly used to take advantage of its new features and to facilitate exchange of code between different international meteorological organizations. Some components of the Unified Model such as the observation processing system and the variational data assimilation system have been written entirely in Fortran 90.

Although it is expected that the Fortran 90 standard will make it easier to exchange code between different organizations, it is important that some basic guidelines are established. To this end, the Met Office has contributed to the European Standards For Writing and Documenting Exchangeable Fortran 90 Code.

Fortran 90 Standards

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