气候变化领域集成服务门户(CCPortal): A pole-to-equator ocean overturning circulation on Enceladus

CCPortal

DOI	10.1038/s41561-021-00706-3
	A pole-to-equator ocean overturning circulation on Enceladus
	Lobo A.H.; Thompson A.F.; Vance S.D.; Tharimena S.
发表日期	2021
ISSN	17520894
起始页码	185
结束页码	189
卷号	14 期号:4
英文摘要	Enceladus is believed to have a saltwater global ocean, heated at the ocean–core interface and losing heat to the floating ice shell above. This configuration suggests an important role for vertical convection. The ice shell has dramatic meridional thickness variations that, in steady state, must be sustained by the ocean circulation against processes acting to remove these anomalies. This could be achieved through spatially separated regions of freezing and melting at the ocean–ice interface. Here, we use an idealized, dynamical ocean model forced by an observationally guided density flux at the ocean–ice interface to argue that Enceladus’s interior ocean should support a meridional overturning circulation. This circulation establishes an interior density structure that is more complex than in studies that have focused only on vertical convection, including a shallow freshwater lens in the polar regions. Spatially separated sites of ice formation and melt enable Enceladus to sustain significant vertical and horizontal stratification, which influences interior heat transport and is critical for understanding the relationship between a global ocean and the planetary energy budget. On the basis of our model, the presence of low salinity layers near the polar ocean–ice interface implies the ocean’s bulk salinity could substantially exceed values inferred from Cassini plume samples. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	Enceladus; floating ice; global ocean; ice thickness; ice-ocean interaction; Moon; oceanic circulation; overturn; paleosalinity; polar region; salinity
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/206929
作者单位	Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Lobo A.H.,Thompson A.F.,Vance S.D.,et al. A pole-to-equator ocean overturning circulation on Enceladus[J],2021,14(4).
APA	Lobo A.H.,Thompson A.F.,Vance S.D.,&Tharimena S..(2021).A pole-to-equator ocean overturning circulation on Enceladus.Nature Geoscience,14(4).
MLA	Lobo A.H.,et al."A pole-to-equator ocean overturning circulation on Enceladus".Nature Geoscience 14.4(2021).