( ( ( Upwelling ( upward movement ) ) ( of ( ( ( deep ( -LRB- ( abyssal -RRB- ) ) ) , ) ( ( cold water ) ( to ( the surface ) ) ) ) ) ) . )
(ROOT (NP (NP (VBG Upwelling) (JJ upward) (NN movement)) (PP (IN of) (NP (NP (JJ deep) (-LRB- -LRB-) (NN abyssal) (-RRB- -RRB-)) (, ,) (NP (NP (JJ cold) (NN water)) (PP (TO to) (NP (DT the) (NN surface)))))) (. .)))
Upwelling upward movement of deep (abyssal), cold water to the surface.
(ROOT (S (NP (NNP Upwelling)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (SBAR (WHADVP (WRB when)) (S (NP (JJ deep) (NN ocean) (NN water)) (VP (VBZ rises) (PP (TO to) (NP (DT the) (NN surface))))))))) (. .)))
Upwelling is the term for when deep ocean water rises to the surface.