A spectral meteorological model on the ICL DAP

The key points to the implementation of a meteorological spectral model on the ICL Distributed Array Processor (DAP) are presented. Spectral models involve transforming the variables between spectral and gridpoint space and these spectral transforms comprise of Legendre and fast Fourier transforms.

The storage format of the data is discussed and the algorithms used for the Legendre transforms presented. Timings of these algorithms are compared with those from a serial machine.