AustralieFrV1, PascalFrancis, Curation, bibRecord, 005896

Internal tide generation by abyssal hills using analytical theory

Identifieur interne : 005896 ( PascalFrancis/Curation ); précédent : 005895; suivant : 005897

Internal tide generation by abyssal hills using analytical theory

Auteurs : Angélique Melet [États-Unis] ; Maxim Nikurashin [Australie] ; Caroline Muller [France] ; S. Falahat [Suède] ; Jonas Nycander [Suède] ; Patrick G. Timko [Royaume-Uni] ; Brian K. Arbic [États-Unis] ; John A. Goff [États-Unis]

Source :

Journal of geophysical research. Oceans [ 2169-9275 ] ; 2013.

RBID : Pascal:14-0049711

Descripteurs français

Pascal (Inist)
- Onde interne, Colline sous marine, Stratification, Topographie, Fond marin, Rugosité, Energie marémotrice, Théorie linéaire, Navette spatiale, Observation radar, Transfert énergie, Conversion énergie, Dorsale océanique, Correction, Dorsale Médio-Atlantique, Dorsale Pacifique Est, Circulation thermohaline, Circulation océanique, Circulation méridienne de retournement.
Wicri :
- topic : Fond marin.

English descriptors

KwdEn :
- East Pacific Rise, Energy conversion, Linear theory, Meridional overturning circulation, Mid-Atlantic Ridge, Radar observation, abyssal hills, corrections, energy transfer, internal waves, mid-ocean ridges, ocean circulation, ocean floors, roughness, space shuttle, stratification, thermohaline circulation, tidal energy, topography.

Abstract

Internal tide driven mixing plays a key role in sustaining the deep ocean stratification and meridional overturning circulation. Internal tides can be generated by topographic horizontal scales ranging from hundreds of meters to tens of kilometers. State of the art topographic products barely resolve scales smaller than ˜10 km in the deep ocean. On these scales abyssal hills dominate ocean floor roughness. The impact of abyssal hill roughness on internal-tide generation is evaluated in this study. The conversion of M₂ barotropic to baroclinic tidal energy is calculated based on linear wave theory both in real and spectral space using the Shuttle Radar Topography Mission SRTM30_PLUS bathymetric product at 1/120° resolution with and without the addition of synthetic abyssal hill roughness. Internal tide generation by abyssal hills integrates to 0.1 TW globally or 0.03 TW when the energy flux is empirically corrected for supercritical slope (i.e., ˜10% of the energy flux due to larger topographic scales resolved in standard products in both cases). The abyssal hill driven energy conversion is dominated by mid-ocean ridges, where abyssal hill roughness is large. Focusing on two regions located over the Mid-Atlantic Ridge and the East Pacific Rise, it is shown that regionally linear theory predicts an increase of the energy flux due to abyssal hills of up to 100% or 60% when an empirical correction for supercritical slopes is attempted. Therefore, abyssal hills, unresolved in state of the art topographic products, can have a strong impact on internal tide generation, especially over mid-ocean ridges.

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<term>energy transfer</term>
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<term>ocean circulation</term>
<term>ocean floors</term>
<term>roughness</term>
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<term>Energie marémotrice</term>
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<term>Navette spatiale</term>
<term>Observation radar</term>
<term>Transfert énergie</term>
<term>Conversion énergie</term>
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<term>Correction</term>
<term>Dorsale Médio-Atlantique</term>
<term>Dorsale Pacifique Est</term>
<term>Circulation thermohaline</term>
<term>Circulation océanique</term>
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<front><div type="abstract" xml:lang="en">Internal tide driven mixing plays a key role in sustaining the deep ocean stratification and meridional overturning circulation. Internal tides can be generated by topographic horizontal scales ranging from hundreds of meters to tens of kilometers. State of the art topographic products barely resolve scales smaller than ˜10 km in the deep ocean. On these scales abyssal hills dominate ocean floor roughness. The impact of abyssal hill roughness on internal-tide generation is evaluated in this study. The conversion of M<sub>2</sub>
 barotropic to baroclinic tidal energy is calculated based on linear wave theory both in real and spectral space using the Shuttle Radar Topography Mission SRTM30_PLUS bathymetric product at 1/120° resolution with and without the addition of synthetic abyssal hill roughness. Internal tide generation by abyssal hills integrates to 0.1 TW globally or 0.03 TW when the energy flux is empirically corrected for supercritical slope (i.e., ˜10% of the energy flux due to larger topographic scales resolved in standard products in both cases). The abyssal hill driven energy conversion is dominated by mid-ocean ridges, where abyssal hill roughness is large. Focusing on two regions located over the Mid-Atlantic Ridge and the East Pacific Rise, it is shown that regionally linear theory predicts an increase of the energy flux due to abyssal hills of up to 100% or 60% when an empirical correction for supercritical slopes is attempted. Therefore, abyssal hills, unresolved in state of the art topographic products, can have a strong impact on internal tide generation, especially over mid-ocean ridges.</div>
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<fA11 i1="03" i2="1"><s1>MULLER (Caroline)</s1>
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<fA11 i1="04" i2="1"><s1>FALAHAT (S.)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>NYCANDER (Jonas)</s1>
</fA11>
<fA11 i1="06" i2="1"><s1>TIMKO (Patrick G.)</s1>
</fA11>
<fA11 i1="07" i2="1"><s1>ARBIC (Brian K.)</s1>
</fA11>
<fA11 i1="08" i2="1"><s1>GOFF (John A.)</s1>
</fA11>
<fA14 i1="01"><s1>Program in Atmospheric and Oceanic Sciences, Princeton University</s1>
<s2>Princeton, New Jersey</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Institute for Marine and Antarctic Studies, University of Tasmania</s1>
<s2>Hobart, Tasmania</s2>
<s3>AUS</s3>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>ARC Centre of Excellence for Climate System Science</s1>
<s3>AUS</s3>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="04"><s1>CNRS/Laboratoire d'Hydrodynamique de l'Ecole Polytechnique</s1>
<s2>Paliseau</s2>
<s3>FRA</s3>
<sZ>3 aut.</sZ>
</fA14>
<fA14 i1="05"><s1>Department of Meteorology, Stockholm University</s1>
<s2>Stockholm</s2>
<s3>SWE</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</fA14>
<fA14 i1="06"><s1>Centre for Applied Marine Sciences, Bangor University</s1>
<s2>Menai Bridge</s2>
<s3>GBR</s3>
<sZ>6 aut.</sZ>
</fA14>
<fA14 i1="07"><s1>Department of Earth and Environmental Sciences, University of Michian</s1>
<s2>Ann Arbor, Michigan</s2>
<s3>USA</s3>
<sZ>7 aut.</sZ>
</fA14>
<fA14 i1="08"><s1>Institute for Geophysics, Jackson School of Geosciences, Univerity of Texas at Austin</s1>
<s2>Austin, Texas</s2>
<s3>USA</s3>
<sZ>8 aut.</sZ>
</fA14>
<fA20><s1>6303-6318</s1>
</fA20>
<fA21><s1>2013</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>3144C1</s2>
<s5>354000500747400290</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2014 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>1 p.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>14-0049711</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="2"><s0>Journal of geophysical research. Oceans</s0>
</fA64>
<fA66 i1="01"><s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Internal tide driven mixing plays a key role in sustaining the deep ocean stratification and meridional overturning circulation. Internal tides can be generated by topographic horizontal scales ranging from hundreds of meters to tens of kilometers. State of the art topographic products barely resolve scales smaller than ˜10 km in the deep ocean. On these scales abyssal hills dominate ocean floor roughness. The impact of abyssal hill roughness on internal-tide generation is evaluated in this study. The conversion of M<sub>2</sub>
 barotropic to baroclinic tidal energy is calculated based on linear wave theory both in real and spectral space using the Shuttle Radar Topography Mission SRTM30_PLUS bathymetric product at 1/120° resolution with and without the addition of synthetic abyssal hill roughness. Internal tide generation by abyssal hills integrates to 0.1 TW globally or 0.03 TW when the energy flux is empirically corrected for supercritical slope (i.e., ˜10% of the energy flux due to larger topographic scales resolved in standard products in both cases). The abyssal hill driven energy conversion is dominated by mid-ocean ridges, where abyssal hill roughness is large. Focusing on two regions located over the Mid-Atlantic Ridge and the East Pacific Rise, it is shown that regionally linear theory predicts an increase of the energy flux due to abyssal hills of up to 100% or 60% when an empirical correction for supercritical slopes is attempted. Therefore, abyssal hills, unresolved in state of the art topographic products, can have a strong impact on internal tide generation, especially over mid-ocean ridges.</s0>
</fC01>
<fC02 i1="01" i2="2"><s0>001E02B</s0>
</fC02>
<fC03 i1="01" i2="2" l="FRE"><s0>Onde interne</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>internal waves</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Colline sous marine</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>abyssal hills</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Stratification</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>stratification</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="SPA"><s0>Estratificación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Topographie</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>topography</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Topografía</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Fond marin</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>ocean floors</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Fondo marino</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Rugosité</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>roughness</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Rugosidad</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Energie marémotrice</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>tidal energy</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="SPA"><s0>Energía maremotriz</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Théorie linéaire</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Linear theory</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Teoría lineal</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Navette spatiale</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>space shuttle</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Observation radar</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Radar observation</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Observación radar</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Transfert énergie</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>energy transfer</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Conversion énergie</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Energy conversion</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Conversión energética</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="2" l="FRE"><s0>Dorsale océanique</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="2" l="ENG"><s0>mid-ocean ridges</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Correction</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>corrections</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="SPA"><s0>Corrección</s0>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="2" l="FRE"><s0>Dorsale Médio-Atlantique</s0>
<s2>NG</s2>
<s5>21</s5>
</fC03>
<fC03 i1="15" i2="2" l="ENG"><s0>Mid-Atlantic Ridge</s0>
<s2>NG</s2>
<s5>21</s5>
</fC03>
<fC03 i1="16" i2="2" l="FRE"><s0>Dorsale Pacifique Est</s0>
<s2>NG</s2>
<s5>22</s5>
</fC03>
<fC03 i1="16" i2="2" l="ENG"><s0>East Pacific Rise</s0>
<s2>NG</s2>
<s5>22</s5>
</fC03>
<fC03 i1="16" i2="2" l="SPA"><s0>Dorsal Pacífico Este</s0>
<s2>NG</s2>
<s5>22</s5>
</fC03>
<fC03 i1="17" i2="2" l="FRE"><s0>Circulation thermohaline</s0>
<s5>41</s5>
</fC03>
<fC03 i1="17" i2="2" l="ENG"><s0>thermohaline circulation</s0>
<s5>41</s5>
</fC03>
<fC03 i1="17" i2="2" l="SPA"><s0>Circulación termohalina</s0>
<s5>41</s5>
</fC03>
<fC03 i1="18" i2="2" l="FRE"><s0>Circulation océanique</s0>
<s5>42</s5>
</fC03>
<fC03 i1="18" i2="2" l="ENG"><s0>ocean circulation</s0>
<s5>42</s5>
</fC03>
<fC03 i1="18" i2="2" l="SPA"><s0>Circulación oceánica</s0>
<s5>42</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE"><s0>Circulation méridienne de retournement</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="19" i2="2" l="ENG"><s0>Meridional overturning circulation</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE"><s0>Océan Atlantique</s0>
<s2>564</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Atlantic Ocean</s0>
<s2>564</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Océano Atlántico</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Océan Pacifique</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Pacific Ocean</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Océano Pacífico</s0>
<s2>564</s2>
</fC07>
<fN21><s1>062</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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Internal tide generation by abyssal hills using analytical theory

Internal tide generation by abyssal hills using analytical theory

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