DOI: 10.1038/s41561-021-00743-y
论文题名: Calcium carbonate dissolution patterns in the ocean
作者: Sulpis O. ; Jeansson E. ; Dinauer A. ; Lauvset S.K. ; Middelburg J.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 6 起始页码: 423
结束页码: 428
语种: 英语
英文关键词: acidification
; calcium carbonate
; dissolution
; ocean acidification
; seafloor
; upwelling
; oceanic regions
英文摘要: Calcium carbonate (CaCO3) minerals secreted by marine organisms are abundant in the ocean. These particles settle and the majority dissolves in deeper waters or at the seafloor. Dissolution of carbonates buffers the ocean, but the vertical and regional distribution and magnitude of dissolution are unclear. Here we use seawater chemistry and age data to derive pelagic CaCO3 dissolution rates in major oceanic regions and provide the first data-based, regional profiles of CaCO3 settling fluxes. We find that global CaCO3 export at 300 m depth is 76 ± 12 Tmol yr−1, of which 36 ± 8 Tmol (47%) dissolves in the water column. Dissolution occurs in two distinct depth zones. In shallow waters, metabolic CO2 release and high-magnesium calcites dominate dissolution while increased CaCO3 solubility governs dissolution in deeper waters. Based on reconstructed sinking fluxes, our data indicate a higher CaCO3 transfer efficiency from the surface to the seafloor in high-productivity, upwelling areas than in oligotrophic systems. These results have implications for assessments of future ocean acidification as well as palaeorecord interpretations, as they demonstrate that surface ecosystems, not only interior ocean chemistry, are key to controlling the dissolution of settling CaCO3 particles. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169818
Appears in Collections: 气候变化与战略
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作者单位: Earth Sciences, Utrecht University, Utrecht, Netherlands; NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway; Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Recommended Citation:
Sulpis O.,Jeansson E.,Dinauer A.,et al. Calcium carbonate dissolution patterns in the ocean[J]. Nature Geoscience,2021-01-01,14(6)