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Large near-inertial oscillations of the Atlantic meridional overturning circulation

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Title: Large near-inertial oscillations of the Atlantic meridional overturning circulation
Authors: Blaker, Adam T.1 atb299@noc.ac.uk, Hirschi, Joël J-M.1, Sinha, Bablu1, de Cuevas, Beverly1, Alderson, Steven1, Coward, Andrew1, Madec, Gurvan1,2
Source: Ocean Modelling. Feb2012, Vol. 42, p50-56. 7p.
Subjects: Atlantic meridional overturning circulation, Oscillations, Time, Gravity waves, Wind pressure
Geographic Terms: Equator
Abstract: Abstract: The Atlantic meridional overturning circulation (AMOC) is a key contributor to Europe’s mild climate. Both observations and models suggest that the AMOC strength varies on a wide range of timescales. Here we show the existence of previously unreported large near inertial AMOC oscillations in a high resolution ocean model. Peak-to-peak these oscillations can exceed 50Sv (50·106 m3 s−1) in one day. The AMOC oscillations are caused by equatorward propagating near-inertial gravity waves (NIGWs) which are forced by temporally changing wind forcing. The existence of NIGWs in the ocean is supported by observations, and a significant fraction of the ocean’s kinetic energy is associated with the near inertial frequencies. Our results also suggest that the NIGW-driven MOC variability would be near invisible to contemporary AMOC observing systems such as the RAPID MOC system at 26.5°N. [Copyright &y& Elsevier]
Copyright of Ocean Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 71416649
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Abstract: The Atlantic meridional overturning circulation (AMOC) is a key contributor to Europe’s mild climate. Both observations and models suggest that the AMOC strength varies on a wide range of timescales. Here we show the existence of previously unreported large near inertial AMOC oscillations in a high resolution ocean model. Peak-to-peak these oscillations can exceed 50Sv (50·106 m3 s−1) in one day. The AMOC oscillations are caused by equatorward propagating near-inertial gravity waves (NIGWs) which are forced by temporally changing wind forcing. The existence of NIGWs in the ocean is supported by observations, and a significant fraction of the ocean’s kinetic energy is associated with the near inertial frequencies. Our results also suggest that the NIGW-driven MOC variability would be near invisible to contemporary AMOC observing systems such as the RAPID MOC system at 26.5°N. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Ocean Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ocemod.2011.11.008
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      – Code: eng
        Text: English
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      – SubjectFull: Atlantic meridional overturning circulation
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      – SubjectFull: Oscillations
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      – SubjectFull: Time
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      – SubjectFull: Gravity waves
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      – SubjectFull: Wind pressure
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      – SubjectFull: Equator
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              Text: Feb2012
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