{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["10(13)"],"submitter":["Kwon EY"],"pubmed_abstract":["Marine biogenic calcium carbonate (CaCO<sub>3</sub>) cycles play a key role in ecosystems and in regulating the ocean's ability to absorb atmospheric carbon dioxide (CO<sub>2</sub>). However, the drivers and magnitude of CaCO<sub>3</sub> cycling are not well understood, especially for the upper ocean. Here, we provide global-scale evidence that heterotrophic respiration in settling marine aggregates may produce localized undersaturated microenvironments in which CaCO<sub>3</sub> particles rapidly dissolve, producing excess alkalinity in the upper ocean. In the deep ocean, dissolution of CaCO<sub>3</sub> is primarily driven by conventional thermodynamics of CaCO<sub>3</sub> solubility with reduced fluxes of CaCO<sub>3</sub> burial to marine sediments beneath more corrosive North Pacific deep waters. Upper ocean dissolution, shown to be sensitive to ocean export production, can increase the neutralizing capacity for respired CO<sub>2</sub> by up to 6% in low-latitude thermocline waters. Without upper ocean dissolution, the ocean might lose 20% more CO<sub>2</sub> to the atmosphere through the low-latitude upwelling regions."],"journal":["Science advances"],"pagination":["eadl0779"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC10980259"],"repository":["biostudies-literature"],"pubmed_title":["Biological export production controls upper ocean calcium carbonate dissolution and CO<sub>2</sub> buffer capacity."],"pmcid":["PMC10980259"],"pubmed_authors":["Dunne JP","Lee K","Kwon EY"],"additional_accession":[]},"is_claimable":false,"name":"Biological export production controls upper ocean calcium carbonate dissolution and CO<sub>2</sub> buffer capacity.","description":"Marine biogenic calcium carbonate (CaCO<sub>3</sub>) cycles play a key role in ecosystems and in regulating the ocean's ability to absorb atmospheric carbon dioxide (CO<sub>2</sub>). However, the drivers and magnitude of CaCO<sub>3</sub> cycling are not well understood, especially for the upper ocean. Here, we provide global-scale evidence that heterotrophic respiration in settling marine aggregates may produce localized undersaturated microenvironments in which CaCO<sub>3</sub> particles rapidly dissolve, producing excess alkalinity in the upper ocean. In the deep ocean, dissolution of CaCO<sub>3</sub> is primarily driven by conventional thermodynamics of CaCO<sub>3</sub> solubility with reduced fluxes of CaCO<sub>3</sub> burial to marine sediments beneath more corrosive North Pacific deep waters. Upper ocean dissolution, shown to be sensitive to ocean export production, can increase the neutralizing capacity for respired CO<sub>2</sub> by up to 6% in low-latitude thermocline waters. Without upper ocean dissolution, the ocean might lose 20% more CO<sub>2</sub> to the atmosphere through the low-latitude upwelling regions.","dates":{"release":"2024-01-01T00:00:00Z","publication":"2024 Mar","modification":"2025-04-22T21:30:32.313Z","creation":"2025-04-06T03:35:19.646Z"},"accession":"S-EPMC10980259","cross_references":{"pubmed":["38552016"],"doi":["10.1126/sciadv.adl0779"]}}