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Biological export production controls upper ocean calcium carbonate dissolution and CO2 buffer capacity

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Title
Biological export production controls upper ocean calcium carbonate dissolution and CO<sub>2</sub> buffer capacity
Author(s)
Eun Young Kwon; Dunne, John P.; Lee, Kitack
Publication Date
2024-03
Journal
Science Advances, v.10, no.13
Publisher
American Association for the Advancement of Science
Abstract
Marine biogenic calcium carbonate (CaCO3) cycles play a key role in ecosystems and in regulating the ocean's ability to absorb atmospheric carbon dioxide (CO2). However, the drivers and magnitude of CaCO3 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 CaCO3 particles rapidly dissolve, producing excess alkalinity in the upper ocean. In the deep ocean, dissolution of CaCO3 is primarily driven by conventional thermodynamics of CaCO3 solubility with reduced fluxes of CaCO3 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 CO2 by up to 6% in low-latitude thermocline waters. Without upper ocean dissolution, the ocean might lose 20% more CO2 to the atmosphere through the low-latitude upwelling regions.
URI
https://pr.ibs.re.kr/handle/8788114/15252
DOI
10.1126/sciadv.adl0779
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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