气候变化领域集成服务门户(CCPortal): Topological constraints by the Greenland-Scotland ridge on AMOC and climate

CCPortal

DOI	10.1175/JCLI-D-19-0726.1
	Topological constraints by the Greenland-Scotland ridge on AMOC and climate
	Rheinlænder J.W.; Ferreira D.; Nisancioglu K.H.
发表日期	2020
ISSN	0894-8755
起始页码	5393
结束页码	5411
卷号	33 期号:13
英文摘要	Changes in the geometry of ocean basins have been influential in driving climate change throughout Earth's history. Here, we focus on the emergence of the Greenland-Scotland Ridge (GSR) and its influence on the ocean state, including large-scale circulation, heat transport, water mass properties, and global climate. Using a coupled atmosphere-ocean-sea ice model, we consider the impact of introducing the GSR in an idealized Earth-like geometry, comprising a narrow Atlantic-like basin and a wide Pacific-like basin. Without the GSR, deep-water formation occurs near the North Pole in the Atlantic basin, associated with a deep meridional overturning circulation (MOC). By introducing the GSR, the volume transport across the sill decreases by 64% and deep convection shifts south of the GSR, dramatically altering the structure of the highlatitude MOC. Due to compensation by the subpolar gyre, the northward ocean heat transport across the GSR only decreases by ∼30%. As in the modern Atlantic Ocean, a bidirectional circulation regime is established with warm Atlantic water inflow and a cold dense overflow across the GSR. In sharp contrast to the large changes north of the GSR, the strength of the Atlantic MOC south of theGSR is unaffected. Outside the high latitudes of the Atlantic basin, the surface climate response is surprisingly small, suggesting that the GSR has little impact on global climate. Our results suggest that caution is required when interpreting paleoproxy and ocean records, which may record large local changes, as indicators of basin-scale changes in the overturning circulation and global climate. © 2020 American Meteorological Society.
英文关键词	Climate change; Earth atmosphere; Heat transfer; Sea ice; Deep-water formation; Greenland-Scotland Ridge; Large-scale circulation; Meridional overturning circulations; Ocean heat transport; Overturning circulation; Topological constraints; Water-mass properties; Oceanography; air-sea interaction; climate change; deep water formation; global climate; heat transfer; meridional circulation; topology; volume transport; water mass; Atlantic Ocean; Atlantic Ocean; Greenland-Scotland Ridge
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171240
作者单位	Department of Earth Science, University of Bergen and the Bjerknes Centre for Climate Research, Bergen, Norway; Department of Meteorology, University of Reading, Reading, United Kingdom; Centre for Earth Evolution and Dynamics, Oslo, Norway
推荐引用方式 GB/T 7714	Rheinlænder J.W.,Ferreira D.,Nisancioglu K.H.. Topological constraints by the Greenland-Scotland ridge on AMOC and climate[J],2020,33(13).
APA	Rheinlænder J.W.,Ferreira D.,&Nisancioglu K.H..(2020).Topological constraints by the Greenland-Scotland ridge on AMOC and climate.Journal of Climate,33(13).
MLA	Rheinlænder J.W.,et al."Topological constraints by the Greenland-Scotland ridge on AMOC and climate".Journal of Climate 33.13(2020).