If T1 writes A, T2 reads that new A before T1 commits, and T1 then aborts, T2 has experienced

Reading data written by an uncommitted transaction (which then rolls back) is the textbook dirty read. The value T2 saw was never officially in the database. Phantom involves new rows appearing; unrepeatable read involves the same row changing across two reads in the same transaction; lost update involves concurrent writes overwriting each other.