( ( This ( warm ( , ( dry air ) ) ) ) ( ( ( ( is ( known ( as ( a ( superior ( air mass ) ) ) ) ) ) and ) ( normally ( ( resides ( above ( a maritime ) ) ) ( ( tropical ( ( -LRB- ( ( ( warm and ) moist ) -RRB- ) ) air ) ) mass ) ) ) ) . ) )
(ROOT (S (NP (DT This) (JJ warm) (, ,) (JJ dry) (NN air)) (VP (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT a) (JJ superior) (NN air) (NN mass))))) (CC and) (VP (ADVP (RB normally)) (VBZ resides) (PP (IN above) (NP (DT a) (NN maritime))) (NP (NP (JJ tropical) (PRN (-LRB- -LRB-) (NP (JJ warm) (CC and) (JJ moist)) (-RRB- -RRB-)) (NN air)) (NP (NN mass))))) (. .)))
This warm, dry air is known as a superior air mass and normally resides above a maritime tropical (warm and moist) air mass.
(ROOT (S (SBAR (IN If) (S (NP (DT an) (NN air) (NN mass)) (VP (VBZ forms) (PP (IN over) (NP (DT an) (NN ocean)))))) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (DT a) (JJ maritime) (NN air) (NN mass)))) (. .)))