Articles | Volume 21, issue 5
https://doi.org/10.5194/os-21-1943-2025
© 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-21-1943-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Sep 2025
Research article |
| 12 Sep 2025
| 12 Sep 2025
Regional modeling of internal-tide dynamics around New Caledonia – Part 2: Tidal incoherence and implications for sea surface height observability
Arne Bendinger
CORRESPONDING AUTHOR
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT3), Toulouse, France
now at: Laboratoire d’Océanographie Physique et Spatiale, Univ. Brest, CNRS, Ifremer, IRD, IUEM, Plouzané, France
Sophie Cravatte
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT3), Toulouse, France
IRD, Centre IRD de Nouméa, New Caledonia
Lionel Gourdeau
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT3), Toulouse, France
Clément Vic
Laboratoire d’Océanographie Physique et Spatiale, Univ. Brest, CNRS, Ifremer, IRD, IUEM, Brest, France
Florent Lyard
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT3), Toulouse, France
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Cited articles
Alford, M. H., MacKinnon, J. A., Nash, J. D., Simmons, H., Pickering, A., Klymak, J. M., Pinkel, R., Sun, O., Rainville, L., Musgrave, R., Beitzel, T., Fu, K. -H., Lu, C. -W.: Energy flux and dissipation in Luzon Strait: Two tales of two ridges, J. Phys. Oceanogr., 41, 2211–2222, https://doi.org/10.1175/JPO-D-11-073.1, 2011. a
Arbic, B. K.: Incorporating tides and internal gravity waves within global ocean general circulation models: A review, Prog. Oceanogr., 206, 102824, https://doi.org/10.1016/j.pocean.2022.102824, 2022. a, b
Arbic, B. K., Alford, M. H., Ansong, J. K., Buijsman, M. C., Ciotti, R. B., Farrar, J. T., Hallberg, R. W., Henze, C. E., Hill, C. N., Luecke, C. A., Menemenlis, D., Metzger, E. J., Muller, M., Nelson, A. D., Nelson, B. C., Ngodock, H. E., Ponte, R. M., Richman, J. G., Savage, A. C., Scott, R. B., Shriver, J. F., Simmons, H. L., Souopgui, I., Timko, P. G., Wallcraft, A. J., Zamudio, L., Zhao, Z.: Primer on global internal tide and internal gravity wave continuum modeling in HYCOM and MITgcm, New frontiers in operational oceanography, 307–392, http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1536242074_55feafcc (last access: 29 September 2021), 2018. a
Bella, A., Lahaye, N., and Tissot, G.: Internal tide energy transfers induced by mesoscale circulation and topography across the North Atlantic, J. Geophys. Res.-Oceans, 129, e2024JC020914, https://doi.org/10.1029/2024JC020914, 2024. a
Bendinger, A.: Internal tides around New Caledonia : dynamics, eddy-internal tide interactions, and SWOT observability, Theses, Université Paul Sabatier – Toulouse III, https://theses.hal.science/tel-04618408 (last access: 20 June 2024), 2023. a
Bendinger, A.: Regional modeling of internal-tide dynamics around New Caledonia. Part 2: Tidal incoherence and implications for sea surface height observability, Zenodo [data set], https://doi.org/10.5281/zenodo.17079808, 2025a. a
Bendinger, A.: Regional modeling of internal-tide dynamics around New Caledonia. Part 2: Tidal incoherence and implications for sea surface height observability, Zenodo [code], https://doi.org/10.5281/zenodo.15592721, 2025b. a
Bendinger, A., Cravatte, S., Gourdeau, L., Brodeau, L., Albert, A., Tchilibou, M., Lyard, F., and Vic, C.: Regional modeling of internal-tide dynamics around New Caledonia – Part 1: Coherent internal-tide characteristics and sea surface height signature, Ocean Sci., 19, 1315–1338, https://doi.org/10.5194/os-19-1315-2023, 2023. a, b, c, d, e
Bendinger, A., Cravatte, S., Gourdeau, L., Rainville, L., Vic, C., Sérazin, G., Durand, F., Marin, F., and Fuda, J.-L.: Internal-tide vertical structure and steric sea surface height signature south of New Caledonia revealed by glider observations, Ocean Sci., 20, 945–964, https://doi.org/10.5194/os-20-945-2024, 2024. a, b, c
Cai, T., Zhao, Z., D'Asaro, E., Wang, J., and Fu, L.-L.: Internal tide variability off Central California: multiple sources, seasonality, and eddying background, J. Geophys. Res.-Oceans, 129, e2024JC020892, https://doi.org/10.1029/2024JC020892, 2024. a
Callies, J. and Wu, W.: Some expectations for submesoscale sea surface height variance spectra, J. Phys. Oceanogr., 49, 2271–2289, https://doi.org/10.1175/JPO-D-18-0272.1, 2019. a
Callies, J., Ferrari, R., Klymak, J. M., and Gula, J.: Seasonality in submesoscale turbulence, Nat. Commun., 6, 6862, https://doi.org/10.1038/ncomms7862, 2015. a
Carrere, L., Arbic, B. K., Dushaw, B., Egbert, G., Erofeeva, S., Lyard, F., Ray, R. D., Ubelmann, C., Zaron, E., Zhao, Z., Shriver, J. F., Buijsman, M. C., and Picot, N.: Accuracy assessment of global internal-tide models using satellite altimetry, Ocean Sci., 17, 147–180, https://doi.org/10.5194/os-17-147-2021, 2021. a
Carter, G. S., Merrifield, M., Becker, J. M., Katsumata, K., Gregg, M., Luther, D., Levine, M., Boyd, T. J., and Firing, Y.: Energetics of M 2 barotropic-to-baroclinic tidal conversion at the Hawaiian Islands, J. Phys. Oceanogr., 38, 2205–2223, https://doi.org/10.1175/2008JPO3860.1, 2008. a, b
Cravatte, S., Bendinger, A., Carpaneto Bastos, C., Detandt, G., Gourdeau, L., Le Ridant, A., Rodier, M., Varillon, D., and Vic, C.: SWOTALIS-4. N/O Antea, 21 novembre au 29 novembre 2023, Nouméa/Nouméa, Ref. Rapport de mission, https://archimer.ifremer.fr/doc/00905/101642/ (last access: 9 January 2025), 2024. a
de Lavergne, C., Falahat, S., Madec, G., Roquet, F., Nycander, J., and Vic, C.: Toward global maps of internal tide energy sinks, Ocean Model., 137, 52–75, https://doi.org/10.1016/j.ocemod.2019.03.010, 2019. a, b, c
de Lavergne, C., Vic, C., Madec, G., Roquet, F., Waterhouse, A. F., Whalen, C., Cuypers, Y., Bouruet-Aubertot, P., Ferron, B., and Hibiya, T.: A parameterization of local and remote tidal mixing, J. Adv. Model. Earth Sy., 12, e2020MS002065, https://doi.org/10.1029/2020MS002065, 2020. a, b
de Lavergne, C., Groeskamp, S., Zika, J., and Johnson, H. L.: The role of mixing in the large-scale ocean circulation, Ocean Mixing, 2022, 35–63, https://doi.org/10.1016/B978-0-12-821512-8.00010-4, 2022. a
Debreu, L., Vouland, C., and Blayo, E.: AGRIF: Adaptive grid refinement in Fortran, Comput. Geosci., 34, 8–13, https://doi.org/10.1016/j.cageo.2007.01.009, 2008. a
Dossmann, Y., Shakespeare, C., Stewart, K., and Hogg, A. M.: Asymmetric internal tide generation in the presence of a steady flow, J. Geophys. Res.-Oceans, 125, e2020JC016503, https://doi.org/10.1029/2020JC016503, 2020. a
Duda, T. F., Lin, Y.-T., Buijsman, M., and Newhall, A. E.: Internal tidal modal ray refraction and energy ducting in baroclinic Gulf Stream currents, J. Phys. Oceanogr., 48, 1969–1993, https://doi.org/10.1175/JPO-D-18-0031.1, 2018. a
Dunphy, M. and Lamb, K. G.: Focusing and vertical mode scattering of the first mode internal tide by mesoscale eddy interaction, J. Geophys. Res.-Oceans, 119, 523–536, https://doi.org/10.1002/2013JC009293, 2014. a, b
Falahat, S., Nycander, J., Roquet, F., Thurnherr, A. M., and Hibiya, T.: Comparison of calculated energy flux of internal tides with microstructure measurements, Tellus A, 66, 23240, https://doi.org/10.3402/tellusa.v66.23240, 2014a. a
Falahat, S., Nycander, J., Roquet, F., and Zarroug, M.: Global calculation of tidal energy conversion into vertical normal modes, J. Phys. Oceanogr., 44, 3225–3244, https://doi.org/10.1175/JPO-D-14-0002.1, 2014b. a
Fu, L.-L. and Ubelmann, C.: On the transition from profile altimeter to swath altimeter for observing global ocean surface topography, J. Atmos. Ocean. Tech., 31, 560–568, https://doi.org/10.1175/JTECH-D-13-00109.1, 2014. a
Fu, L.-L., Pavelsky, T., Cretaux, J.-F., Morrow, R., Farrar, J. T., Vaze, P., Sengenes, P., Vinogradova-Shiffer, N., Sylvestre-Baron, A., Picot, N., Dibarboure, G.: The Surface Water and Ocean Topography Mission: A breakthrough in radar remote sensing of the ocean and land surface water, Geophys. Res. Lett., 51, e2023GL107652, https://doi.org/10.1029/2023GL107652, 2024. a
Guo, Z., Wang, S., Cao, A., Xie, J., Song, J., and Guo, X.: Refraction of the M2 internal tides by mesoscale eddies in the South China Sea, Deep-Sea Res. Pt. I, 192, 103946, https://doi.org/10.1016/j.dsr.2022.103946, 2023. a, b
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A., Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D., Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., De Chiara, 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., Thépaut, J.-N.: The ERA5 global reanalysis, Q. J. Roy. Meteor. Soc., 146, 1999–2049, https://doi.org/10.1002/qj.3803, 2020. a
Kang, D. and Fringer, O.: Energetics of barotropic and baroclinic tides in the Monterey Bay area, J. Phys. Oceanogr., 42, 272–290, https://doi.org/10.1175/JPO-D-11-039.1, 2012. a
Kaur, H., Buijsman, M. C., Zhao, Z., and Shriver, J. F.: Seasonal variability in the semidiurnal internal tide – a comparison between sea surface height and energetics, Ocean Sci., 20, 1187–1208, https://doi.org/10.5194/os-20-1187-2024, 2024. a, b, c, d
Kelly, S. and Nash, J.: Internal-tide generation and destruction by shoaling internal tides, Geophys. Res. Lett., 37, L23611, https://doi.org/10.1029/2010GL045598, 2010. a
Kelly, S. M. and Lermusiaux, P. F.: Internal-tide interactions with the Gulf Stream and Middle Atlantic Bight shelfbreak front, J. Geophys. Res.-Oceans, 121, 6271–6294, https://doi.org/10.1002/2016JC011639, 2016. a
Keppler, L., Cravatte, S., Chaigneau, A., Pegliasco, C., Gourdeau, L., and Singh, A.: Observed characteristics and vertical structure of mesoscale eddies in the southwest tropical Pacific, J. Geophys. Res.-Oceans, 123, 2731–2756, https://doi.org/10.1002/2017JC013712, 2018. a
Kerry, C. G., Powell, B. S., and Carter, G. S.: Effects of remote generation sites on model estimates of M2 internal tides in the Philippine Sea, J. Phys. Oceanogr., 43, 187–204, https://doi.org/10.1175/JPO-D-12-081.1, 2013. a
Kerry, C. G., Powell, B. S., and Carter, G. S.: The impact of subtidal circulation on internal tide generation and propagation in the Philippine Sea, J. Phys. Oceanogr., 44, 1386–1405, https://doi.org/10.1175/JPO-D-13-0142.1, 2014. a
Kerry, C. G., Powell, B. S., and Carter, G. S.: Quantifying the incoherent M2 internal tide in the Philippine Sea, J. Phys. Oceanogr., 46, 2483–2491, https://doi.org/10.1175/JPO-D-16-0023.1, 2016. a, b
Klein, P., Lapeyre, G., Siegelman, L., Qiu, B., Fu, L.-L., Torres, H., Su, Z., Menemenlis, D., and Le Gentil, S.: Ocean-scale interactions from space, Earth and Space Science, 6, 795–817, https://doi.org/10.1029/2018EA000492, 2019. a
Lahaye, N., Gula, J., and Roullet, G.: Internal Tide Cycle and Topographic Scattering Over the North Mid-Atlantic Ridge, J. Geophys. Res.-Oceans, 125, e2020JC016376, https://doi.org/10.1029/2020JC016376, 2020. a, b, c
Lahaye, N., Ponte, A., Le Sommer, J., and Albert, A.: Internal tide surface signature and incoherence in the North Atlantic, Geophys. Res. Lett., 51, e2024GL108508, https://doi.org/10.1029/2024GL108508, 2024. a
Lamb, K. G. and Dunphy, M.: Internal wave generation by tidal flow over a two-dimensional ridge: Energy flux asymmetries induced by a steady surface trapped current, J. Fluid Mech., 836, 192–221, https://doi.org/10.1017/jfm.2017.800, 2018. a
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. a
Melet, A., Hallberg, R., Legg, S., and Polzin, K.: Sensitivity of the ocean state to the vertical distribution of internal-tide-driven mixing, J. Phys. Oceanogr., 43, 602–615, https://doi.org/10.1175/JPO-D-12-055.1, 2013. a
Melet, A., Legg, S., and Hallberg, R.: Climatic impacts of parameterized local and remote tidal mixing, J. Climate, 29, 3473–3500, https://doi.org/10.1175/JCLI-D-15-0153.1, 2016. a
Merrifield, M. A. and Holloway, P. E.: Model estimates of M2 internal tide energetics at the Hawaiian Ridge, J. Geophys. Res.-Oceans, 107, 5-1–5-12, https://doi.org/10.1029/2001JC000996, 2002. a
Morrow, R., Fu, L.-L., Ardhuin, F., Benkiran, M., Chapron, B., Cosme, E., d’Ovidio, F., Farrar, J. T., Gille, S. T., Lapeyre, G., Le Traon, P.-Y., Pascual, A., Ponte, A., Qiu, B., Rascle, N., Ubelmann, C., Wang, J., Zaron, E. D.: Global observations of fine-scale ocean surface topography with the Surface Water and Ocean Topography (SWOT) mission, Frontiers in Marine Science, 6, 232, https://doi.org/10.3389/fmars.2019.00232, 2019. a
Müller, M., Cherniawsky, J., Foreman, M., and von Storch, J.-S.: Global M2 internal tide and its seasonal variability from high resolution ocean circulation and tide modeling, Geophys. Res. Lett., 39, L19607, https://doi.org/10.1029/2012GL053320, 2012. a, b
Nagai, T. and Hibiya, T.: Internal tides and associated vertical mixing in the i ndonesian a rchipelago, J. Geophys. Res.-Oceans, 120, 3373–3390, https://doi.org/10.1002/2014JC010592, 2015. a
Nash, J. D., Kelly, S. M., Shroyer, E. L., Moum, J. N., and Duda, T. F.: The unpredictable nature of internal tides on continental shelves, J. Phys. Oceanogr., 42, 1981–2000, https://doi.org/10.1175/JPO-D-12-028.1, 2012. a, b, c
Nelson, A. D., Arbic, B. K., Zaron, E. D., Savage, A. C., Richman, J. G., Buijsman, M. C., and Shriver, J. F.: Toward realistic nonstationarity of semidiurnal baroclinic tides in a hydrodynamic model, J. Geophys. Res.-Oceans, 124, 6632–6642, https://doi.org/10.1029/2018JC014737, 2019. a
Opel, L., Schindelegger, M., and Ray, R. D.: A likely role for stratification in long-term changes of the global ocean tides, Communications Earth & Environment, 5, 261, https://doi.org/10.1038/s43247-024-01432-5, 2024. a
Park, J.-H. and Watts, D. R.: Internal tides in the southwestern Japan/East Sea, J. Phys. Oceanogr., 36, 22–34, https://doi.org/10.1175/JPO2846.1, 2006. a
Peacock, T. and Tabaei, A.: Visualization of nonlinear effects in reflecting internal wave beams, Phys. Fluids, 17, 061702, https://doi.org/10.1063/1.1932309, 2005. a
Pickering, A., Alford, M., Nash, J., Rainville, L., Buijsman, M., Ko, D. S., and Lim, B.: Structure and variability of internal tides in Luzon Strait, J. Phys. Oceanogr., 45, 1574–1594, https://doi.org/10.1175/JPO-D-14-0250.1, 2015. a, b
Ponte, A. L. and Klein, P.: Incoherent signature of internal tides on sea level in idealized numerical simulations, Geophys. Res. Lett., 42, 1520–1526, https://doi.org/10.1002/2014GL062583, 2015. a
Qiu, B., Chen, S., Klein, P., Wang, J., Torres, H., Fu, L.-L., and Menemenlis, D.: Seasonality in transition scale from balanced to unbalanced motions in the world ocean, J. Phys. Oceanogr., 48, 591–605, https://doi.org/10.1175/JPO-D-17-0169.1, 2018. a
Rainville, L. and Pinkel, R.: Propagation of low-mode internal waves through the ocean, J. Phys. Oceanogr., 36, 1220–1236, https://doi.org/10.1175/JPO2889.1, 2006. a, b, c, d
Rainville, L., Lee, C. M., Rudnick, D. L., and Yang, K.-C.: Propagation of internal tides generated near Luzon Strait: Observations from autonomous gliders, J. Geophys. Res.-Oceans, 118, 4125–4138, https://doi.org/10.1002/jgrc.20293, 2013. a
Ray, R. D. and Zaron, E. D.: M2 internal tides and their observed wavenumber spectra from satellite altimetry, J. Phys. Oceanogr., 46, 3–22, https://doi.org/10.1175/JPO-D-15-0065.1, 2016. a
Rocha, C. B., Gille, S. T., Chereskin, T. K., and Menemenlis, D.: Seasonality of submesoscale dynamics in the Kuroshio Extension, Geophys. Res. Lett., 43, 11–304, https://doi.org/10.1002/2016GL071349, 2016. a
Savage, A. C., Waterhouse, A. F., and Kelly, S. M.: Internal tide nonstationarity and wave–mesoscale interactions in the Tasman Sea, J. Phys. Oceanogr., 50, 2931–2951, https://doi.org/10.1175/JPO-D-19-0283.1, 2020. a
Sérazin, G., Marin, F., Gourdeau, L., Cravatte, S., Morrow, R., and Dabat, M.-L.: Scale-dependent analysis of in situ observations in the mesoscale to submesoscale range around New Caledonia, Ocean Sci., 16, 907–925, https://doi.org/10.5194/os-16-907-2020, 2020. a
Shakespeare, C. J.: Interdependence of internal tide and lee wave generation at abyssal hills: Global calculations, J. Phys. Oceanogr., 50, 655–677, https://doi.org/10.1175/JPO-D-19-0179.1, 2020. a
Shriver, J., Arbic, B. K., Richman, J., Ray, R., Metzger, E., Wallcraft, A., and Timko, P.: An evaluation of the barotropic and internal tides in a high-resolution global ocean circulation model, J. Geophys. Res.-Oceans, 117, C10024, https://doi.org/10.1029/2012JC008170, 2012. a
Simmons, H. L., Hallberg, R. W., and Arbic, B. K.: Internal wave generation in a global baroclinic tide model, Deep-Sea Res. Pt. II, 51, 3043–3068, https://doi.org/10.1016/j.dsr2.2004.09.015, 2004. a
Tchilibou, M., Gourdeau, L., Lyard, F., Morrow, R., Koch Larrouy, A., Allain, D., and Djath, B.: Internal tides in the Solomon Sea in contrasted ENSO conditions, Ocean Sci., 16, 615–635, https://doi.org/10.5194/os-16-615-2020, 2020. a, b
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. a
Vergara, O., Morrow, R., Pujol, M.-I., Dibarboure, G., and Ubelmann, C.: Global submesoscale diagnosis using along-track satellite altimetry, Ocean Sci., 19, 363–379, https://doi.org/10.5194/os-19-363-2023, 2023. a
Vic, C., Naveira Garabato, A. C., Green, J. M., Waterhouse, A. F., Zhao, Z., Melet, A., de Lavergne, C., Buijsman, M. C., and Stephenson, G. R.: Deep-ocean mixing driven by small-scale internal tides, Nat. Commun., 10, 2099, https://doi.org/10.1038/s41467-019-10149-5, 2019. a, b, c
Vic, C., Ferron, B., Thierry, V., Mercier, H., and Lherminier, P.: Tidal and near-inertial internal waves over the Reykjanes Ridge, J. Phys. Oceanogr., 51, 419–437, https://doi.org/10.1175/JPO-D-20-0097.1, 2021. a
Wang, M., Zhu, X.-H., Zheng, H., Chen, J., Liu, Z.-J., Ren, Q., Liu, Y., Nan, F., Yu, F., and Li, Q.: Direct evidence of standing internal tide west of the Luzon Strait observed by a large-scale observation array, J. Phys. Oceanogr., 53, 2263–2280, https://doi.org/10.1175/JPO-D-23-0043.1, 2023. a
Wang, Y. and Legg, S.: Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy, J. Phys. Oceanogr., 53, 2293–2316, https://doi.org/10.1175/JPO-D-23-0045.1, 2023. a
Waterhouse, A. F., MacKinnon, J. A., Nash, J. D., Alford, M. H., Kunze, E., Simmons, H. L., Polzin, K. L., Laurent, L. C. S., Sun, O. M., Pinkel, R., Talley, L. D., Whalen, C. B., Huussen, T. N., Carter, G. S., Fer, I., Waterman, S., Naveira Garabato, A. C., Sanford, T. B., Lee, C. M.: Global patterns of diapycnal mixing from measurements of the turbulent dissipation rate, J. Phys. Oceanogr., 44, 1854–1872, https://doi.org/10.1175/JPO-D-13-0104.1, 2014. a
Yan, T., Qi, Y., Jing, Z., and Cai, S.: Seasonal and spatial features of barotropic and baroclinic tides in the northwestern South China Sea, J. Geophys. Res.-Oceans, 125, e2018JC014860, https://doi.org/10.1029/2018JC014860, 2020. a
Zaron, E. D.: Mapping the nonstationary internal tide with satellite altimetry, J. Geophys. Res.-Oceans, 122, 539–554, https://doi.org/10.1002/2016JC012487, 2017. a, b
Zaron, E. D.: Baroclinic tidal sea level from exact-repeat mission altimetry, J. Phys. Oceanogr., 49, 193–210, https://doi.org/10.1175/JPO-D-18-0127.1, 2019. a, b
Zeng, Z., Brandt, P., Lamb, K., Greatbatch, R., Dengler, M., Claus, M., and Chen, X.: Three-dimensional numerical simulations of internal tides in the Angolan upwelling region, J. Geophys. Res.-Oceans, 126, e2020JC016460, https://doi.org/10.1029/2020JC016460, 2021. a
Zhao, Z., Alford, M. H., Girton, J. B., Rainville, L., and Simmons, H. L.: Global observations of open-ocean mode-1 M 2 internal tides, J. Phys. Oceanogr., 46, 1657–1684, https://doi.org/10.1175/JPO-D-15-0105.1, 2016. a
Zilberman, N., Becker, J., Merrifield, M., and Carter, G.: Model estimates of M2 internal tide generation over Mid-Atlantic Ridge topography, J. Phys. Oceanogr., 39, 2635–2651, https://doi.org/10.1175/2008JPO4136.1, 2009. a
Zilberman, N., Merrifield, M., Carter, G., Luther, D., Levine, M., and Boyd, T. J.: Incoherent nature of M 2 internal tides at the Hawaiian Ridge, J. Phys. Oceanogr., 41, 2021–2036, https://doi.org/10.1175/JPO-D-10-05009.1, 2011. a, b, c, d
Short summary
Temporal variability of the semidiurnal internal tide around New Caledonia is investigated using regional modeling. An important contribution to temporal variability not linked to the spring–neap tide cycle is due to the presence of mesoscale eddies both at the generation sites and in the propagation direction. The incoherent tide has a widespread signature in sea surface height (SSH), challenging the SSH observability of mesoscale to submesoscale dynamics.
Temporal variability of the semidiurnal internal tide around New Caledonia is investigated using...
