气候变化领域集成服务门户(CCPortal): Chesapeake Bay acidification buffered by spatially decoupled carbonate mineral cycling

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DOI	10.1038/s41561-020-0584-3
	Chesapeake Bay acidification buffered by spatially decoupled carbonate mineral cycling
	Su J.; Cai W.-J.; Brodeur J.; Chen B.; Hussain N.; Yao Y.; Ni C.; Testa J.M.; Li M.; Xie X.; Ni W.; Scaboo K.M.; Xu Y.-Y.; Cornwell J.; Gurbisz C.; Owens M.S.; Waldbusser G.G.; Dai M.; Kemp W.M.
发表日期	2020
ISSN	17520894
起始页码	441
结束页码	447
卷号	13 期号:6
英文摘要	Uptake of anthropogenic carbon dioxide (CO2) from the atmosphere has acidified the ocean and threatened the health of marine organisms and their ecosystems. In coastal waters, acidification is often enhanced by CO2 and acids produced under high rates of biological respiration. However, less is known about buffering processes that counter coastal acidification in eutrophic and seasonally hypoxic water bodies, such as the Chesapeake Bay. Here, we use carbonate chemistry, mineralogical analyses and geochemical modelling to demonstrate the occurrence of a bay-wide pH-buffering mechanism resulting from spatially decoupled calcium carbonate mineral cycling. In summer, high rates of photosynthesis by dense submerged aquatic vegetation at the head of the bay and in shallow, nearshore areas generate high pH, an elevated carbonate mineral saturation state and net alkalinity uptake. Calcium carbonate particles produced under these conditions are subsequently transported downstream into corrosive subsurface waters, where their dissolution buffers pH decreases caused by aerobic respiration and anthropogenic CO2. Because this pH-buffering mechanism would be strengthened by further nutrient load reductions and associated submerged aquatic vegetation recovery, our findings suggest that the reduction of nutrient inputs into coastal waters will not only reduce eutrophication and hypoxia, but also alleviate the severity of coastal ocean acidification. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	acidification; alkalinity; buffering; calcium carbonate; carbonate system; coastal water; ocean acidification; saturation; spatial analysis; Chesapeake Bay; United States
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/206835
作者单位	School of Marine Science and Policy, University of Delaware, Newark, DE, United States; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China; Materials Science and Engineering, University of Delaware, Newark, DE, United States; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD, United States; Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, United States; St. Mary’s College of Maryland, St. Mary’s City, MD, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Hangzhou, China
推荐引用方式 GB/T 7714	Su J.,Cai W.-J.,Brodeur J.,et al. Chesapeake Bay acidification buffered by spatially decoupled carbonate mineral cycling[J],2020,13(6).
APA	Su J..,Cai W.-J..,Brodeur J..,Chen B..,Hussain N..,...&Kemp W.M..(2020).Chesapeake Bay acidification buffered by spatially decoupled carbonate mineral cycling.Nature Geoscience,13(6).
MLA	Su J.,et al."Chesapeake Bay acidification buffered by spatially decoupled carbonate mineral cycling".Nature Geoscience 13.6(2020).