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Analysis of the field data during an 18-h period from four stations provides evidence that a complex sill in the Kara Gates is the site of regular production of intense large-amplitude nonlinear internal waves. Satellite data show a presence of a relatively warm northeastward surface current from the Barents Sea toward the Kara Sea attaining 0.8\u20130.9 m\/s. Triangle-shaped measurements using three thermal profilers revealed pronounced vertical thermocline oscillations up to 40 m associated with propagation of short-period nonlinear internal waves of depression generated by stratified flow passing a system of shallow sills in the strait. The most intense waves were recorded during the ebb tide slackening and reversal when the background flow was predominantly supercritical. Observed internal waves had wavelengths of ~100 m and traveled northeastward with phase speeds of 0.8\u20130.9 m\/s. The total internal wave energy per unit crest length for the largest waves was estimated to be equal to 1.0\u20131.8 MJ\/m.<\/jats:p>","DOI":"10.3390\/rs15245769","type":"journal-article","created":{"date-parts":[[2023,12,18]],"date-time":"2023-12-18T10:04:47Z","timestamp":1702893887000},"page":"5769","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Multi-Sensor Observations Reveal Large-Amplitude Nonlinear Internal Waves in the Kara Gates, Arctic Ocean"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6378-8956","authenticated-orcid":false,"given":"Igor E.","family":"Kozlov","sequence":"first","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4650-0479","authenticated-orcid":false,"given":"Ilya O.","family":"Kopyshov","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"},{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"}]},{"given":"Dmitry I.","family":"Frey","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"},{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"},{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Eugene G.","family":"Morozov","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"},{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"},{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Igor P.","family":"Medvedev","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Arina I.","family":"Shiryborova","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"},{"name":"Lomonosov Moscow State University, 119991 Moscow, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7515-6398","authenticated-orcid":false,"given":"Ksenya P.","family":"Silvestrova","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4198-4400","authenticated-orcid":false,"given":"Aleksandr V.","family":"Gavrikov","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Elizaveta A.","family":"Ezhova","sequence":"additional","affiliation":[{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"},{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Dmitry M.","family":"Soloviev","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"}]},{"given":"Evgeny V.","family":"Plotnikov","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"}]},{"given":"Vladislav R.","family":"Zhuk","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"}]},{"given":"Pavel V.","family":"Gaisky","sequence":"additional","affiliation":[{"name":"Marine Hydrophysical Institute of RAS, 299011 Sevastopol, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6659-0934","authenticated-orcid":false,"given":"Alexander A.","family":"Osadchiev","sequence":"additional","affiliation":[{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"},{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Natalia B.","family":"Stepanova","sequence":"additional","affiliation":[{"name":"Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia"},{"name":"Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"548","DOI":"10.1126\/science.253.5019.548","article-title":"Predictable upwelling and the shoreward transport of planktonic larvae by internal tidal bores","volume":"253","author":"Pineda","year":"1991","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2093","DOI":"10.1175\/1520-0485(2003)033<2093:SAGOTA>2.0.CO;2","article-title":"Structure and Generation of Turbulence at Interfaces Strained by Internal Solitary Waves Propagating Shoreward over the Continental Shelf","volume":"33","author":"Moum","year":"2003","journal-title":"J. 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