This GCW term is also in SWEET as http://sweetontology.net/phenSolid/Accretion with no definition. I note that there are really two kinds of accretion. The first would have a definition like:
A material congelation process whereby precipitation particles grow due to collision and union of a frozen particle (ice crystal or snowflake) with a supercooled liquid droplet which freezes on impact.
The second like:
The process by which a layer of ice or snow builds on solid objects such as overhead lines that are exposed to precipitation icing events.
The difference is whether a supercooled droplet is contacting a solid (ice crystal or snowflake) or whether a raindrop or snowflake is impacting a much colder solid surface. In other words, one of the objects needs to be very cold, the other can be at or somewhat above the freezing point.
This GCW term is also in SWEET as http://sweetontology.net/phenSolid/Accretion with no definition. I note that there are really two kinds of accretion. The first would have a definition like:
A material congelation process whereby precipitation particles grow due to collision and union of a frozen particle (ice crystal or snowflake) with a supercooled liquid droplet which freezes on impact.
The second like:
The process by which a layer of ice or snow builds on solid objects such as overhead lines that are exposed to precipitation icing events.
The difference is whether a supercooled droplet is contacting a solid (ice crystal or snowflake) or whether a raindrop or snowflake is impacting a much colder solid surface. In other words, one of the objects needs to be very cold, the other can be at or somewhat above the freezing point.