( ( In ( regions ( of ( ocean upwelling ) ) ) ) ( , ( ( ( carbon ( rich water ) ) ( from ( the ( deep ocean ) ) ) ) ( ( ( ( comes ( to ( the surface ) ) ) and ) ( ( releases carbon ) ( into ( ( the atmosphere ) ( as ( carbon dioxide ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NNS regions)) (PP (IN of) (NP (NN ocean) (NN upwelling))))) (, ,) (NP (NP (NN carbon) (JJ rich) (NN water)) (PP (IN from) (NP (DT the) (JJ deep) (NN ocean)))) (VP (VP (VBZ comes) (PP (TO to) (NP (DT the) (NN surface)))) (CC and) (VP (VBZ releases) (NP (NN carbon)) (PP (IN into) (NP (NP (DT the) (NN atmosphere)) (PP (IN as) (NP (NN carbon) (NN dioxide))))))) (. .)))
In regions of ocean upwelling, carbon rich water from the deep ocean comes to the surface and releases carbon into the atmosphere as carbon dioxide.
(ROOT (S (NP (NNP Ocean) (NNP acidification)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NP (JJ excess) (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN atmosphere)))) (VP (VBZ causes) (S (NP (DT the) (NNS oceans)) (VP (TO to) (VP (VB become) (NP (NNS acidic))))))))) (. .)))
Ocean acidification occurs when excess carbon dioxide in the atmosphere causes the oceans to become acidic.