气候变化领域集成服务门户(CCPortal): Locations and mechanisms of ocean ventilation in the high-latitude north atlantic in an eddy-permitting ocean model

CCPortal

DOI	10.1175/JCLI-D-20-0191.1
	Locations and mechanisms of ocean ventilation in the high-latitude north atlantic in an eddy-permitting ocean model
	MACGILCHRIST G.A.; JOHNSON H.L.; MARSHALL D.P.; LIQUE C.; THOMAS M.; JACKSON L.C.; WOOD R.A.
发表日期	2020
ISSN	0894-8755
起始页码	10113
结束页码	10131
卷号	33 期号:23
英文摘要	A substantial fraction of the deep ocean is ventilated in the high-latitude North Atlantic. Consequently, the region plays a crucial role in transient climate change through the uptake of carbon dioxide and heat. However, owing to the Lagrangian nature of the process, many aspects of deep Atlantic Ocean ventilation and its representation in climate simulations remain obscure. We investigate the nature of ventilation in the high-latitude North Atlantic in an eddy-permitting numerical ocean circulation model using a comprehensive set of Lagrangian trajectory experiments. Backward-in-time trajectories from a model-defined North Atlantic Deep Water (NADW) reveal the locations of subduction from the surface mixed layer at high spatial resolution. The major fraction of NADW ventilation results from subduction in the Labrador Sea, predominantly within the boundary current (;60% of ventilated NADW volume) and a smaller fraction arising from open ocean deep convection (;25%). Subsurface transformations-due in part to the model's parameterization of bottomintensified mixing-facilitate NADW ventilation, such that water subducted in the boundary current ventilates all of NADW, not just the lighter density classes. There is a notable absence of ventilation arising from subduction in the Greenland-Iceland-Norwegian Seas, due to the re-entrainment of those waters as they move southward. Taken together, our results emphasize an important distinction between ventilation and dense water formation in terms of the location where each takes place, and their concurrent sensitivities. These features of NADWventilation are explored to understand how the representation of high-latitude processes impacts properties of the deep ocean in a state-of-the-science numerical simulation. 2020 American Meteorological Society. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Carbon dioxide; Carbon dioxide process; Climate change; Lagrange multipliers; Location; Ventilation; American meteorological societies; Climate simulation; High spatial resolution; Lagrangian trajectories; North Atlantic Deep Water; Ocean circulation models; Surface mixed layers; Transient climate change; Oceanography; air-sea interaction; atmospheric circulation; boundary current; carbon dioxide; climate change; eddy; marine environment; mixing; ventilation; Atlantic Ocean; Atlantic Ocean (North)
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/170998
作者单位	Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Department of Atmospheric Oceanic and Planetary Physics, University of Oxford, Oxford, United Kingdom; Université Brest, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale, IUEM, Brest, France; National Oceanic and Atmospheric Administration, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; University Corporation for Atmospheric Research, Boulder, CO, United States; Hadley Centre, Met Office, Exeter, United Kingdom
推荐引用方式 GB/T 7714	MACGILCHRIST G.A.,JOHNSON H.L.,MARSHALL D.P.,et al. Locations and mechanisms of ocean ventilation in the high-latitude north atlantic in an eddy-permitting ocean model[J],2020,33(23).
APA	MACGILCHRIST G.A..,JOHNSON H.L..,MARSHALL D.P..,LIQUE C..,THOMAS M..,...&WOOD R.A..(2020).Locations and mechanisms of ocean ventilation in the high-latitude north atlantic in an eddy-permitting ocean model.Journal of Climate,33(23).
MLA	MACGILCHRIST G.A.,et al."Locations and mechanisms of ocean ventilation in the high-latitude north atlantic in an eddy-permitting ocean model".Journal of Climate 33.23(2020).