Arg0:causer of defrosting
Arg:item losing its frost
| arg1 subject (-) | |
|---|---|
|  | |
| Arg1: | [*-1] -> they | 
| REL: | thaw | 
| ArgM-LOC: | in the morning sun | 
'in the morning sun' is arguably the arg0 here, but I felt in the end that the semantic role of the sun is based more on inference than literal meaning.
Arg0:causer of defrosting
Arg1:item losing its frost
| partial total defrosting (-) | |
|---|---|
|  | |
| ArgM-ADV: | partially | 
| REL: | [ thawed] [ out] | 
| Arg1: | [*-1] |