( ( and ( ( Global ( ocean measurements ) ) ( of ( ocean-atmospheric ( carbon ( dioxide ( exchange ( and ( atmosphere-ocean-biology interactions ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB and) (NP (NP (JJ Global) (NN ocean) (NNS measurements)) (PP (IN of) (NP (JJ ocean-atmospheric) (NN carbon) (NN dioxide) (NN exchange) (CC and) (NN atmosphere-ocean-biology) (NNS interactions))))) (. .)))
and Global ocean measurements of ocean-atmospheric carbon dioxide exchange and atmosphere-ocean-biology interactions.
(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.