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Potential vorticity estimates of absolute velocities on the Ross Sea shelf

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Title: Potential vorticity estimates of absolute velocities on the Ross Sea shelf
Authors: Falcini, Federico1 federico.falcini@uniroma1.it, Iudicone, Daniele2, Salusti, Ettore3
Source: Deep-Sea Research Part I, Oceanographic Research Papers. Mar2009, Vol. 56 Issue 3, p314-329. 16p.
Subjects: Vortex motion, Hydrodynamics, Speed
Geographic Terms: Ross Sea (Antarctica)
Abstract: Abstract: We analyze absolute velocities on the continental shelf off Cape Adare, in the western sector of the Ross Sea (Antarctica). Such a velocity field is here inferred by using a novel inverse method of absolute velocity determination, namely the tracer PV method, related to potential vorticities of temperature and salinity. This theoretical choice allows us to directly use in situ temperature and salinity data. Moreover, it avoids high-order derivatives, which can give large uncertainties that affect estimates made using previous approaches. The tracer PV method also allows us to separately estimate the steady and non-diffusive component and the unsteady and diffusive components of the flow. The western sector of the Ross Sea is characterized by a surface layer of Antarctic Surface Water over layers of Low Salinity Shelf Water and High Salinity Shelf Water, flowing northward with average velocities ∼6–7cm/s. At ∼200m depth an intrusion of warmer and saltier Circumpolar Deep Water is also evident in our data. The steady absolute velocities are in good agreement with those obtained from the classical Margules equation, in particular regarding the northward flux of the High Salinity Shelf Water. Furthermore, velocities due to diffusive processes and mesoscale activity are discussed. Finally, a steady “thermal” approximation is discussed; it allows for a qualitative check of the results by means of temperature horizontal sections only. [Copyright &y& Elsevier]
Copyright of Deep-Sea Research Part I, Oceanographic Research Papers is the property of Pergamon Press - An Imprint of Elsevier Science 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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DbLabel: Engineering Source
An: 36337784
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PubTypeId: academicJournal
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  Data: Potential vorticity estimates of absolute velocities on the Ross Sea shelf
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  Data: <searchLink fieldCode="AR" term="%22Falcini%2C+Federico%22">Falcini, Federico</searchLink><relatesTo>1</relatesTo><i> federico.falcini@uniroma1.it</i><br /><searchLink fieldCode="AR" term="%22Iudicone%2C+Daniele%22">Iudicone, Daniele</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Salusti%2C+Ettore%22">Salusti, Ettore</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Deep-Sea+Research+Part+I%2C+Oceanographic+Research+Papers%22">Deep-Sea Research Part I, Oceanographic Research Papers</searchLink>. Mar2009, Vol. 56 Issue 3, p314-329. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Vortex+motion%22">Vortex motion</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Speed%22">Speed</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Ross+Sea+%28Antarctica%29%22">Ross Sea (Antarctica)</searchLink>
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  Label: Abstract
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  Data: Abstract: We analyze absolute velocities on the continental shelf off Cape Adare, in the western sector of the Ross Sea (Antarctica). Such a velocity field is here inferred by using a novel inverse method of absolute velocity determination, namely the tracer PV method, related to potential vorticities of temperature and salinity. This theoretical choice allows us to directly use in situ temperature and salinity data. Moreover, it avoids high-order derivatives, which can give large uncertainties that affect estimates made using previous approaches. The tracer PV method also allows us to separately estimate the steady and non-diffusive component and the unsteady and diffusive components of the flow. The western sector of the Ross Sea is characterized by a surface layer of Antarctic Surface Water over layers of Low Salinity Shelf Water and High Salinity Shelf Water, flowing northward with average velocities ∼6–7cm/s. At ∼200m depth an intrusion of warmer and saltier Circumpolar Deep Water is also evident in our data. The steady absolute velocities are in good agreement with those obtained from the classical Margules equation, in particular regarding the northward flux of the High Salinity Shelf Water. Furthermore, velocities due to diffusive processes and mesoscale activity are discussed. Finally, a steady “thermal” approximation is discussed; it allows for a qualitative check of the results by means of temperature horizontal sections only. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Deep-Sea Research Part I, Oceanographic Research Papers is the property of Pergamon Press - An Imprint of Elsevier Science 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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      – Type: doi
        Value: 10.1016/j.dsr.2008.10.005
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 314
    Subjects:
      – SubjectFull: Vortex motion
        Type: general
      – SubjectFull: Hydrodynamics
        Type: general
      – SubjectFull: Speed
        Type: general
      – SubjectFull: Ross Sea (Antarctica)
        Type: general
    Titles:
      – TitleFull: Potential vorticity estimates of absolute velocities on the Ross Sea shelf
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            NameFull: Falcini, Federico
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            NameFull: Iudicone, Daniele
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            NameFull: Salusti, Ettore
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              M: 03
              Text: Mar2009
              Type: published
              Y: 2009
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            – TitleFull: Deep-Sea Research Part I, Oceanographic Research Papers
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