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When evaluating the behaviour of a microphysics parametrization in 3-dimensional numerical models, it can be difficult to differentiate between the effects of the microphysics, the effects of the dynamics or the feedbacks between the two. Furthermore, in many microphysics schemes there are a number of free parameters and exploring the behaviour of the scheme across the full parameter space is extremely computationally expensive if running a 3D dynamical model.

In order to aid the development and testing of microphysics parametrizations, the KiD model has been developed as a simple but consistent driver to which different microphysics schemes can be coupled. The primary motivation for developing the KiD model is to better understand the differences seen between 3D models in the different GCSS intercomparison cases, however it also provides a useful framework in which to develop and explore the sensitivities of new and well-used schemes.

The model is made freely available to anyone who wishes to participate in the intercomparison and use the driver model to develop their microphysics scheme. The code can be downloaded from here.

The code has been designed to be easily interfaced with both bulk and bin microphysics schemes with an arbitrary number of species, bins and moments. However, if you are unable to interface your scheme then please let us know at . Details of how to interface your microphysics scheme can be found in the documentation.