A lightweight software library has been developed to realise the
coupling of Earth system model components. The software provides parallelised
two-dimensional neighbourhood search, interpolation, and communication for the
coupling between any two model components. The software offers flexible
coupling of physical fields defined on regular and irregular grids on the
sphere without a priori assumptions about grid structure or grid element
types. All supported grids can be combined with any of the supported
interpolations. We describe the new aspects of our approach and provide an
overview of the implemented functionality and of some algorithms we use.
Preliminary performance measurements for a set of realistic use cases are
presented to demonstrate the potential performance and scalability of our
approach. YAC 1.2.0 is now used for the coupling of the model components in
the Icosahedral Nonhydrostatic (ICON) general circulation model
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