气候变化领域集成服务门户(CCPortal): Multidecadal changes in southern ocean ventilation since the 1960s driven by wind and buoyancy forcing

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DOI	10.1175/JCLI-D-19-0947.1
	Multidecadal changes in southern ocean ventilation since the 1960s driven by wind and buoyancy forcing
	Patara L.; Böning C.W.; Tanhua T.
发表日期	2021
ISSN	08948755
起始页码	1485
结束页码	1502
卷号	34 期号:4
英文摘要	Enhanced Southern Ocean ventilation in recent decades has been suggested to be a relevant modulator of the observed changes in ocean heat and carbon uptake. This study focuses on the Southern Ocean midlatitude ventilation changes from the 1960s to the 2010s. A global 1/48 configuration of the NEMO–Louvain-la-Neuve sea ice model, version 2 (LIM2), including the inert tracer CFC-12 (a proxy of ocean ventilation) is forced with the CORE, phase II (CORE-II), and JRA-55 driving ocean (JRA55-do) atmospheric reanalyses. Sensitivity experiments, where the variability of wind stress and/ or the buoyancy forcing is suppressed on interannual time scales, are used to unravel the mechanisms driving ventilation changes. Ventilation changes are estimated by comparing CFC-12 interior inventories among the different experiments. All simulations suggest a multidecadal fluctuation of Southern Ocean ventilation, with a decrease until the 1980s–90s and a subsequent increase. This evolution is related to the atmospheric forcing and is caused by the (often counteracting) effects of wind stress and buoyancy forcing. Until the 1980s, increased buoyancy gains caused the ventilation decrease, whereas the subsequent ventilation increase was driven by strengthened wind stress causing deeper mixed layers and a stronger meridional overturning circulation. Wind stress emerges as the main driver of ventilation changes, even though buoyancy forcing modulates its trend and decadal variability. The three Southern Ocean basins take up CFC-12 in distinct density intervals but overall respond similarly to the atmospheric forcing. This study suggests that Southern Ocean ventilation is expected to increase as long as the effect of increasing Southern Hemisphere wind stress overwhelms that of increased stratification. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Decadal variability; Ocean; Ocean circulation; Ocean models; Southern Ocean; Tracers
语种	英语
scopus关键词	Buoyancy; Oceanography; Sea ice; Wind stress; American meteorological societies; Atmospheric forcing; Copyright informations; Decadal variability; Interannual time scale; Meridional overturning circulations; Multidecadal fluctuations; Southern Hemisphere; Ventilation; atmospheric forcing; buoyancy forcing; decadal variation; numerical model; oceanic circulation; sea breeze; wind stress; Southern Ocean
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/178625
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Patara L.,Böning C.W.,Tanhua T.. Multidecadal changes in southern ocean ventilation since the 1960s driven by wind and buoyancy forcing[J],2021,34(4).
APA	Patara L.,Böning C.W.,&Tanhua T..(2021).Multidecadal changes in southern ocean ventilation since the 1960s driven by wind and buoyancy forcing.Journal of Climate,34(4).
MLA	Patara L.,et al."Multidecadal changes in southern ocean ventilation since the 1960s driven by wind and buoyancy forcing".Journal of Climate 34.4(2021).