气候变化领域集成服务门户(CCPortal): Calcium carbonate dissolution patterns in the ocean

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DOI	10.1038/s41561-021-00743-y
	Calcium carbonate dissolution patterns in the ocean
	Sulpis O.; Jeansson E.; Dinauer A.; Lauvset S.K.; Middelburg J.J.
发表日期	2021
ISSN	17520894
起始页码	423
结束页码	428
卷号	14 期号:6
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.
英文关键词	acidification; calcium carbonate; dissolution; ocean acidification; seafloor; upwelling; oceanic regions
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206962
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
推荐引用方式 GB/T 7714	Sulpis O.,Jeansson E.,Dinauer A.,et al. Calcium carbonate dissolution patterns in the ocean[J],2021,14(6).
APA	Sulpis O.,Jeansson E.,Dinauer A.,Lauvset S.K.,&Middelburg J.J..(2021).Calcium carbonate dissolution patterns in the ocean.Nature Geoscience,14(6).
MLA	Sulpis O.,et al."Calcium carbonate dissolution patterns in the ocean".Nature Geoscience 14.6(2021).