( ( ( The upwelling ) ( along ( ( the ( eastern boundary ) ) ( of ( the ocean ) ) ) ) ) ( ( is ( ( ( ( caused ( by ( persistent winds ) ) ) ( from ( ( the ( ( northwest ( that transport ) ) water ) ) offshore ) ) ) , ) ( ( allowing ( deeper water ) ) ( to ( rise ( to ( the surface ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN upwelling)) (PP (IN along) (NP (NP (DT the) (JJ eastern) (NN boundary)) (PP (IN of) (NP (DT the) (NN ocean)))))) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (JJ persistent) (NNS winds))) (PP (IN from) (NP (NP (DT the) (ADVP (RB northwest) (NP (DT that) (NN transport))) (NN water)) (ADVP (RB offshore)))) (, ,) (S (VP (VBG allowing) (NP (JJR deeper) (NN water)) (S (VP (TO to) (VP (VB rise) (PP (TO to) (NP (DT the) (NN surface)))))))))) (. .)))
The upwelling along the eastern boundary of the ocean is caused by persistent winds from the northwest that transport water offshore, allowing deeper water to rise 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.