气候变化领域集成服务门户(CCPortal): Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean

CCPortal

DOI	10.1038/s41558-019-0418-8
	Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean
	Negrete-García G.; Lovenduski N.S.; Hauri C.; Krumhardt K.M.; Lauvset S.K.
发表日期	2019
ISSN	1758678X
卷号	9 期号:4
英文摘要	Models project that with current CO 2 emission rates, the Southern Ocean surface will be undersaturated with respect to aragonite by the end of this century 1–4 . This will result in widespread impacts on biogeochemistry and ocean ecosystems 5–7 , particularly the health of aragonitic organisms, such as pteropods 7 , which can dominate polar surface water communities 6 . Here, we quantify the depth of the present-day Southern Ocean aragonite saturation horizon using hydrographic and ocean carbon chemistry observations, and use a large ensemble of simulations from the Community Earth System Model (CESM) 8,9 to track its evolution. A new, shallow aragonite saturation horizon emerges in many Southern Ocean locations between now and the end of the century. While all ensemble members capture the emergence, internal climate variability may affect the year of emergence; thus, its detection may have been overlooked by ensemble average analysis in the past. The emergence of the new horizon is driven by the slow accumulation of anthropogenic CO 2 in the Southern Ocean thermocline, where the carbonate ion concentration exhibits a local minimum and approaches undersaturation. The new horizon is also apparent under an emission-stabilizing scenario indicating an inevitable, sudden decrease in the volume of suitable habitat for aragonitic organisms. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124435
作者单位	Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; Environmental Studies Program and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway; Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway; Integrative Oceanography Division, Scripps Institution of Oceanography, La Jolla, CA, United States; Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Negrete-García G.,Lovenduski N.S.,Hauri C.,et al. Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean[J],2019,9(4).
APA	Negrete-García G.,Lovenduski N.S.,Hauri C.,Krumhardt K.M.,&Lauvset S.K..(2019).Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean.Nature Climate Change,9(4).
MLA	Negrete-García G.,et al."Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean".Nature Climate Change 9.4(2019).