Articles | Volume 21, issue 4
https://doi.org/10.5194/os-21-1589-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-1589-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Jul 2025
Research article |
| 30 Jul 2025
| 30 Jul 2025
Turbulent dissipation along contrasting internal tide paths off the Amazon shelf from AMAZOMIX
Fabius Kouogang
CORRESPONDING AUTHOR
CECI, Université de Toulouse, CERFACS/CNRS/IRD, Toulouse, France
Departamento de Oceanografia, Universidade Federal de Pernambuco, DOCEAN/UFPE, Recife, Brazil
Ariane Koch-Larrouy
CECI, Université de Toulouse, CERFACS/CNRS/IRD, Toulouse, France
Jorge Magalhaes
Department of Geoscience, Environment and Spatial Planning (DGAOT), Faculty of Sciences, University of Porto, Porto, Portugal
Alex Costa da Silva
Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy
Daphne Kerhervé
CECI, Université de Toulouse, CERFACS/CNRS/IRD, Toulouse, France
Arnaud Bertrand
Departamento de Oceanografia, Universidade Federal de Pernambuco, DOCEAN/UFPE, Recife, Brazil
Evan Cervelli
Rockland Scientific Inc, Lunenburg, Nova Scotia, Canada
Fernand Assene
Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy
Department of Maritime Navigation and Information Systems, National Advanced School of Maritime and Ocean Science and Technology (ENSTMO), University of Ebolowa, Ebolowa, Cameroon
Jean-François Ternon
MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Sète, France
Pierre Rousselot
IMAGO, Université de Bretagne Occidentale, CNRS, Ifremer, IRD, Brest, France
James Lee
Departamento de Oceanografia, Universidade Federal do Pará, UFPA, Belém, Brazil
Marcelo Rollnic
Departamento de Oceanografia, Universidade Federal do Pará, UFPA, Belém, Brazil
Moacyr Araujo
Departamento de Oceanografia, Universidade Federal de Pernambuco, DOCEAN/UFPE, Recife, Brazil
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Cited articles
Assene, F., Koch-Larrouy, A., Dadou, I., Tchilibou, M., Morvan, G., Chanut, J., Costa da Silva, A., Vantrepotte, V., Allain, D., and Tran, T.-K.: Internal tides off the Amazon shelf – Part 1: The importance of the structuring of ocean temperature during two contrasted seasons, Ocean Sci., 20, 43–67, https://doi.org/10.5194/os-20-43-2024, 2024.
Assuncao, R. V., Silva, A. C., Roy, A., Bourlès, B., Silva, C. A. H. S., Ternon, J.-F., Araujo, M., and Bertrand, A.: 3D characterisation of the thermohaline structure in the southwestern tropical Atlantic derived from functional data analysis of in situ profiles, Prog. Oceanogr., 187, 102399, https://doi.org/10.1016/j.pocean.2020.102399, 2020.
Barbot, S., Lyard, F., Tchilibou, M., and Carrere, L.: Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay, Ocean Sci., 17, 1563–1583, https://doi.org/10.5194/os-17-1563-2021, 2021.
Barnier, B., Reynaud, T., Beckmann, A., Böning, C., Molines, J.-M., Barnard, S., and Jia, Y.: On the seasonal variability and eddies in the North Brazil Current: insights from model intercomparison experiments, Prog. Oceanogr., 48, 195–230, https://doi.org/10.1016/S0079-6611(01)00005-2, 2001.
Bertrand, A., de Saint Leger, E., and Koch-Larrouy, A.: AMAZOMIX 2021 cruise, RV Antea, https://doi.org/10.17600/18001364, 2021.
Bordois, L.: Internal tide modeling: Hydraulic & Topographic controls, PhD thesis, Université Toulouse III Paul-Sabatier, 195 pp., tel-01281760, version 1, https://theses.hal.science/tel-01281760 (last access: 20 September 2024), 2015.
Bourlès, B., Gouriou, Y., and Chuchla, R.: On the circulation in the upper layer of the western equatorial Atlantic, J. Geophys. Res., 104, 21151–21170, https://doi.org/10.1029/1999JC900058, 1999.
Bouruet-Aubertot, P., Cuypers, Y., Ferron, B., Dausse, D., Ménage, O., Atmadipoera, A. S., and Jaya, I.: Contrasted turbulence intensities in the Indonesian Throughflow: a challenge for parameterizing energy dissipation rate, Ocean Dynam., 68, 779–800, https://doi.org/10.1007/s10236-018-1159-3, 2018.
Brainerd, K. and Gregg, M. C.: Surface mixed and mixing layer depths, Deep-Sea Res., 42, 1521–1543, https://doi.org/10.1016/0967-0637(95)00068-H, 1995.
Brandt, P., Rubino, A., and Fischer, J.: Large-amplitude internal solitary waves in the North Equatorial Countercurrent, J. Phys. Oceanogr., 32, 1567–1573, https://doi.org/10.1175/1520-0485(2002)032<1567:LAISWI>2.0.CO;2, 2002.
Cisewski, B., Strass, V. H., Losch, M., and Prandke, H.: Mixed layer analysis of a mesoscale eddy in the Antarctic Polar Front Zone, J. Geophys. Res., 113, C05017, https://doi.org/10.1029/2007JC004372, 2008.
Coles, V. J., Brooks, M. T., Hopkins, J., Stukel, M. R., Yager, P. L., and Hood, R. R.: The pathways and properties of the Amazon River Plume in the tropical North Atlantic Ocean, J. Geophys. Res., 118, 6894–6913, https://doi.org/10.1002/2013JC008981, 2013.
da Silveira, I. C. A., de Miranda, L. B., and Brown, W. S.: On the origins of the North Brazil Current, J. Geophys. Res.-Oceans, 99, 22501–22512, https://doi.org/10.1029/94JC01776, 1994.
de Boyer Montégut, C., Madec, G., Fischer, A. S., Lazar, A., and Iudicone, D.: Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology, J. Geophys. Res., 109, C12003, https://doi.org/10.1029/2006JC004051, 2004.
de Macedo, C. R., Koch-Larrouy, A., da Silva, J. C. B., Magalhães, J. M., Lentini, C. A. D., Tran, T. K., Rosa, M. C. B., and Vantrepotte, V.: Spatial and temporal variability in mode-1 and mode-2 internal solitary waves from MODIS-Terra sun glint off the Amazon shelf, Ocean Sci., 19, 1357–1374, https://doi.org/10.5194/os-19-1357-2023, 2023.
de Macedo, C. R., Koch-Larrouy, A., da Silva, J. C. B., Magalhães, J. M., Assene, F., Tran, M. D., Dadou, I., M’Hamdi, A., Tran, T. K., and Vantrepotte, V.: Internal tide signatures on surface chlorophyll concentration in the Brazilian Equatorial Margin, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-2307, 2025.
Dossa, N., da Silva, A. C., Koch-Larrouy, A., and Kouogang, F.: Near-surface western boundary circulation off the Amazon Plume from AMAZOMIX data, in preparation, 2025.
Fer, I., Dengler, M., Holtermann, P., Le Boyer, A., and Lueck, R. G.: ATOMIX benchmark datasets for dissipation rate measurements using shear probes, Sci. Data, 11, 518, https://doi.org/10.1038/s41597-024-03323-y, 2024.
Fratantoni, D. M. and Glickson, D. A.: North Brazil Current Ring Generation and Evolution Observed with SeaWiFS, J. Phys. Oceanogr., 32, 1058–1074, https://doi.org/10.1175/1520-0485(2002)032<1058:NBCRGA>2.0.CO;2, 2002.
Garrett, C. and Kunze, E.: Internal tide generation in the deep ocean, Annu. Rev. Fluid Mech., 39, 57–87, https://doi.org/10.1146/annurev.fluid.39.050905.110227, 2007.
Geyer, W. R.: Tide-induced mixing in the Amazon Frontal Zone, J. Geophys. Res., 100, 2341, https://doi.org/10.1029/94JC02543, 1995.
Gille, S. T., Ledwell, J., Naveira-Garabato, A., Speer, K., Balwada, D., Brearley, A., Girton, J. B., Griesel, A., Ferrari, R., Klocker, A., LaCasce, J., Lazarevich, P., Mackay, N., Meredith, M. P., Messias, M.-J., Owens, B., Sallée, J.-B., Sheen, K., Shuckburgh, E., Smeed, D. A., St. Laurent, L. C., Toole, J. M., Watson, A. J., Wienders, N., and Zajaczkovski, U.: The diapycnal and isopycnal mixing experiment: a first assessment, CLIVARExchanges, 17, 46–48, https://nora.nerc.ac.uk/id/eprint/18245 (last access: 20 September 2024), 2012.
Gregg, M., Sanford, T., and Winkel, D.: Reduced mixing from the breaking of internal waves in equatorial waters, Nature, 422, 513–515, https://doi.org/10.1038/nature01507, 2003.
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A.,Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schep-ers, D., Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., DeChiara, G., Dahlgren, P., Dee, D., Diamantakis, M., Dragani, R.,Flemming, J., Forbes, R., Fuentes, M., Geer, A., Haimberger,L., Healy, S., Hogan, R. J., Hólm, E., Janisková, M., Keeley, S.,Laloyaux, P., Lopez, P., Lupu, C., Radnoti, G., de Rosnay, P.,Rozum, I., Vamborg, F., Villaume, S., and Thépaut, J.-N.: The ERA5 global reanalysis, Q. J. Roy. Meteor. Soc., 146, 1999–2049, https://doi.org/10.1002/qj.3803, 2020.
Huang, P.-Q., Cen, X.-R., Lu, Y.-Z., Guo, S.-X., and Zhou, S.-Q.: Global distribution of the oceanic bottom mixed layer thickness, Geophys. Res. Lett., 46, 1547–1554, https://doi.org/10.1029/2018GL081159, 2019.
Huthnance, J. M.: Circulation, exchange and water masses at the ocean margin: the role of physical processes at the shelf edge, Prog. Oceanogr., 35, 353–431, https://doi.org/10.1016/0079-6611(95)80003-C, 1995.
Inall, M. E., Toberman, M., Polton, J. A., Palmer, M. R., Green, J. A. M., and Rippeth, T. P.: Shelf Seas Baroclinic Energy Loss: Pycnocline Mixing and Bottom Boundary Layer Dissipation, J. Geophys. Res.-Oceans, 126, 2020JC016528, https://doi.org/10.1029/2020JC016528, 2021.
Ivey, G. N., Bluteau, C. E., Gayen, B., Jones, N. L., and Sohail, T.: Roles of Shear and Convection in Driving Mixing in the Ocean, Geophys. Res. Lett., 48, e2020GL089455, https://doi.org/10.1029/2020GL089455, 2020.
Jackson, C. R., da Silva, J. C. B., and Jeans, G.: The generation of nonlinear internal waves, Oceanography, 25, 108–123, https://doi.org/10.5670/oceanog.2012.46, 2012.
Johns, W. E., Lee, T. N., Beardsley, R. C., Candela, J., Limeburner, R., and Castro Filho, B. M.: Annual Cycle and Variability of the North Brazil Current, J. Phys. Oceanogr., 28, 103–128, https://doi.org/10.1175/1520-0485(1998)028<0103:ACAVOT>2.0.CO;2, 1998.
Klymak, J. M., Pinkel, R., and Rainville, L.: Direct breaking of the internal tide near topography: Kaena ridge, hawaii, J. Phys. Oceanogr., 38, 380–399, https://doi.org/10.1175/2007JPO3728.1, 2008.
Koch-Larrouy, A., Lengaigne, M., Terray, P., Madec, G., and Masson, S.: Tidal mixing in the Indonesian Seas and its effect on the tropical climate system, Clim. Dynam., 34, 891–904, https://doi.org/10.1007/s00382-009-0642-4, 2010.
Koch-Larrouy, A., Atmadipoera, A., van Beek, P., Madec, G., Aucan, J., Lyard, F., Grelet, J., and Souhaut, M.: Estimates of tidal mixing in the Indonesian archipelago from multidisciplinary INDOMIX in-situ data, Deep-Sea Res. Pt. I, 106, 136–153, https://doi.org/10.1016/j.dsr.2015.09.007, 2015.
Kunze, E.: The internal-wave-driven meridional overturning circulation, J. Phys. Oceanogr., 47, 2673–2689, https://doi.org/10.1175/JPO-D-16-0142.1, 2017.
Lellouche, J.-M., Greiner, E., Le Galloudec, O., Garric, G., Regnier, C., Drevillon, M., Benkiran, M., Testut, C.-E., Bourdalle-Badie, R., Gasparin, F., Hernandez, O., Levier, B., Drillet, Y., Remy, E., and Le Traon, P.-Y.: Recent updates to the Copernicus Marine Service global ocean monitoring and forecasting real-time
Lozovatsky, I. D., Roget, E., Fernando, H. J. S., Figueroa, M., and Shapovalov, S.: Sheared turbulence in a weakly stratified upper ocean, Deep-Sea Res. Pt. I, 53, 387–407, https://doi.org/10.1016/j.dsr.2005.10.002, 2006.
Lueck, R., Fer, I., Bluteau, C., Dengler, M., Holtermann, P., Inoue, R., LeBoyer, A., Nicholson, S., Schulz, K., and Stevens, C. L.: Best practices recommendations for estimating dissipation rates from shear probes, Frontiers in Marine Science, 11, 1334327, https://doi.org/10.3389/fmars.2024.1334327, 2024.
Lyard, F. H., Allain, D. J., Cancet, M., Carrère, L., and Picot, N.: FES2014 global ocean tide atlas: design and performance, Ocean Sci., 17, 615–649, https://doi.org/10.5194/os-17-615-2021, 2021.
Madec, G., Bourdallé-Badie, R., Chanut, J., Clementi, E., Coward, A., Ethé, C., Iovino, D., Lea, D., Lévy, C., Lovato, T., Martin, N., Masson, S., Mocavero, S., Rousset, C., Storkey, D., Vancoppenolle, M., Müeller, S., Nurser, G., Bell, M., and Samson, G.: NEMO ocean engine, Zenodo, https://doi.org/10.5281/zenodo.3878122, 2019.
Magalhaes, J. M., da Silva, J. C. B., Buijsman, M. C., and Garcia, C. A. E.: Effect of the North Equatorial Counter Current on the generation and propagation of internal solitary waves off the Amazon shelf (SAR observations), Ocean Sci., 12, 243–255, https://doi.org/10.5194/os-12-243-2016, 2016.
M'hamdi, A., Koch-Larrouy, A., Costa da Silva, A., Dadou, I., De Macedo, C. R., Bosse, A., Vantrepotte, V., Aguedjou, H. M., Tran, T.-K., Testor, P., Mortier, L., Bertrand, A., Mendes de Castro Melo, P. A., Lee, J., Rollnic, M., and Araujo, M.: Impact of Internal Tides on Chlorophyll-a Distribution and Primary Production off the Amazon Shelf from Glider Measurements and Satellite Observations, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-2141, 2025.
Miles, J. W.: On the stability of heterogeneous shear flows, J. Fluid Mech., 10, 496–508, https://doi.org/10.1017/S0022112061000305, 1961.
Muacho, S., da Silva, J. C. B., Brotas, V., Oliveira, P. B., and Magalhaes, J. M.: Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal tidal wave interaction, J. Marine Syst., 136, 22–30, https://doi.org/10.1016/j.jmarsys.2014.03.016, 2014.
Munk, W. and Wunsch, C.: Abyssal recipes II: Energetics of tidal and wind mixing, Deep-Sea Res. Pt. I, 45, 1977–2010, https://doi.org/10.1016/S0967-0637(98)00070-3, 1998.
Nasmyth, P. W.: Oceanic turbulence, PhD thesis, University of British Columbia, 71 pp., https://doi.org/10.14288/1.0084817, 1970.
Neto, A. V. N. and da Silva, A. C.: Seawater temperature changes associated with the North Brazil current dynamics, Ocean Dynam., 64, 13–27, https://doi.org/10.1007/s10236-013-0667-4, 2014.
New, A. and da Silva, J.: Remote-sensing evidence for the local generation of internal soliton packets in the central Bay of Biscay, Deep-Sea Res. Pt. I, 49, 915–934, https://doi.org/10.1016/S0967-0637(01)00082-6, 2002.
New, A. L. and Pingree, R. D.: Local Generation Of Internal Soliton Packets In The Central Bay Of Biscay, Deep-Sea Res., 39, 1521–1534, https://doi.org/10.1016/0198-0149(92)90045-U, 1992.
Noh, Y. and Lee, W.-S.: Mixed and mixing layer depths simulated by an OGCM, J. Oceanogr., 64, 217–225, https://doi.org/10.1007/s10872-008-0017-1, 2008.
Rainville, L. and Pinkel, R.: Propagation of Low-Mode Internal Waves through the Ocean, J. Phys. Oceanogr., 36, 1220, https://doi.org/10.1175/JPO2889.1, 2006.
Rousselot, P., Cervelli, E., Fouilland, E., Koch-Larrouy, A., Lebourges-Dhaussy, A., Meriaux, X., Le Ridant, A., Roubaud, F., Roudaut, G., Ternon, J.-F., Vantrepotte, V., and Bertrand, A.: AMAZOMIX cruise – Physical datasets, SEANOE [data set], https://doi.org/10.17882/97235, 2021.
Ruault, V., Jouanno, J., Durand, F., Chanut, J., and Benshila, R.: Role of the Tide on the Structure of the Amazon Plume: A Numerical Modeling Approach, J. Geophys. Res.-Oceans, 125, e2019JC015495, https://doi.org/10.1029/2019JC015495, 2020.
Silva, J. D., Buijsman, M. C., and Magalhaes, J.: Internal waves on the upstream side of a large sill of the Mascarene Ridge: a comprehensive view of their generation mechanisms and evolution, Deep-Sea Res. Pt. I, 99, 87–104, https://doi.org/10.1016/j.dsr.2015.01.002, 2015.
Simpson, J. H. and Sharples, J.: Introduction to the physical and biological oceanography of shelf seas, Cambridge University Press, 1–24, https://doi.org/10.1038/250404a0, 2012.
Solano, M. S., Buijsman, M. C., Shriver, J. F., Magalhaes, J., da Silva, J., Jackson, C., Arbic, B. K., and Barkan, R.: Nonlinear internal tides in a realistically forced global ocean simulation, J. Geophys. Res.-Oceans, 128, e2023JC019913, https://doi.org/10.1029/2023JC019913, 2023.
Stansfield, K., Garrett, C., and Dewey, R.: The probability distribution of the Thorpe displacement within overturns in Juan de Fuca Strait, J. Phys. Oceanogr., 31, 3421–3434, https://doi.org/10.1175/1520-0485(2001)031<3421:TPDOTT>2.0.CO;2, 2001.
Sutherland, G., Reverdin, G., Marié, L., and Ward, B.: Mixed and mixing layer depths in the ocean surface boundary layer under conditions of diurnal stratification, Geophys. Res. Lett., 41, 8469–8476, https://doi.org/10.1002/2014GL061939, 2014.
Takahashi, A. and Hibiya, T.: Assessment of finescale parameterizations of deep ocean mixing in the presence of geostrophic current shear: Results of microstructure measurements in the Antarctic Circumpolar Current region, J. Geophys. Res.-Oceans, 124, 135–153, https://doi.org/10.1029/2018JC014030, 2019.
Tchilibou, M., Koch-Larrouy, A., Barbot, S., Lyard, F., Morel, Y., Jouanno, J., and Morrow, R.: Internal tides off the Amazon shelf during two contrasted seasons: interactions with background circulation and SSH imprints, Ocean Sci., 18, 1591–1618, https://doi.org/10.5194/os-18-1591-2022, 2022.
Thorpe, S. A.: Models of energy loss from internal waves breaking in the ocean, J. Fluid Mech., 836, 72–116, https://doi.org/10.1017/jfm.2017.780, 2018.
Whalen, C. B., Talley, L. D., and MacKinnon, J. A.: Spatial and temporal variability of global ocean mixing inferred from Argo profiles, Geophys. Res. Lett, 39, L18612, https://doi.org/10.1029/2012GL053196, 2012.
Xie, X. H., Cuypers, Y., Bouruet-Aubertot, P., Ferron, B., Pichon, A., Lourenço, A., and Cortes, N.: Large-amplitude internal tides, solitary waves, and turbulence in the central Bay of Biscay, Geophys. Res. Lett., 40, 2748–2754, https://doi.org/10.1002/grl.50533, 2013.
Xu, P., Yang, W., Zhu, B., Wei, H., Zhao, L., and Nie, H.: Turbulent mixing and vertical nitrate flux induced by the semidiurnal internal tides in the southern Yellow Sea, Cont. Shelf Res., 208, 104240, https://doi.org/10.1016/j.csr.2020.104240, 2020.
Zhao, Z., Alford, M. H., and Girton, J. B.: Mapping low-mode internal tides from multisatellite altimetry, Oceanography, 25, 42–51, https://doi.org/10.5670/oceanog.2012.40, 2012.
Zhao, Z., Alford, M. H., Girton, J. B., Rainville, L., and Simmons, H. L.: Global Observations of Open-Ocean Mode-1 M2 Internal Tides, J. Phys. Oceanogr., 46, 1657–1684, https://doi.org/10.1175/JPO-D-15-0105.1, 2016.
Short summary
New research reveals that ocean mixing off the Amazon coast peaks not only near wave origins but also 230 km offshore, where different wave paths may intersect. This overlap likely forms strong solitary waves that intensify turbulence. Based on the AMAZOMIX-2021 cruise, which collected direct turbulence measurements alongside hydrographic data, the study quantifies dissipation and the relative contributions of tidal shear and large-scale shear. This mixing helps redistribute heat and nutrients, playing a key role in climate regulation and marine ecosystems.
New research reveals that ocean mixing off the Amazon coast peaks not only near wave origins but...
