Icing model

Icing model is based on ice aggregation method described ISO 12394:2001. The method assumeds that ice is accumulated over a freely rotating, standard cylinder (3cm diameter, 1 m tall). The rotation ensures that the ice is aggregated equally on all sides of the cylinder.

Icing model calculates the ice growth rate based on temperature, wind speed, cloud liquid water content and number concentration of the cloud dropplets. The first three values can be obtained from the weather model AROME, which was used in the production of Finnish Wind Atlas. The cloud dropplet number concentration is assumed to be constant 100 cm-3.

In the Icing atlas the melting (and falling off the blade) is assumed to occur when temperature exceed +0.5 C during two consequtive timesteps, which corresponds 6 hours in total.