#1. 'Up' is an adverb and 'above' is a preposition. That is quite a storm building up above Alaska.
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Mister Micawber 'Up' is an adverb and 'above' is a preposition.Some would regard 'up' as a particle, part of the multi-word verb/phrasal verb 'build up' That makes no difference. The sentences are as Mr M gave them.