Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46571 10.2205/2021ES000769 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Structure of the bottom water flow in the Vema Channel based on the measurements from the R/V Akademik Sergey Vavilov Structure of the bottom water flow in the Vema Channel based on the measurements from the R/V Akademik Sergey Vavilov Morozov E G Morozov E G egmorozov@mail.ru) Frey D I Frey D I Krechik V A Krechik V A Капустина М. В. Kapustina M. V. Pisareva M N Pisareva M N Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru 21 3 29 10 2021 https://rjes.ru/en/nauka/article/46571/view

The bottom waters in the Atlantic Ocean originate from the Weddell Sea. These waters of Antarctic origin flow from the Argentine Basin to the Brazil Basin along three pathways: through the Vema and Hunter channels and over the Santos Plateau. The Vema Channel is a conduit for the coldest and densest Antarctic waters to the north. It is a narrow passage between two terraces with a minimum width of 16 km. The propagation of bottom waters in the deep-water Vema Channel occurs as a well-mixed jet. The coldest part of the flow is displaced to the eastern slope of the deep-water channel due to the influence of the bottom Ekman friction. The second core of the flow is observed in the upper part of the channel over its western slope. This jet was also found in the continuation of the AABW flow at the exit from the Vema Channel. We analyze data over the section across the Vema Channel collected in several years of research from the R/V Akademik Sergey Vavilov .

The bottom waters in the Atlantic Ocean originate from the Weddell Sea. These waters of Antarctic origin flow from the Argentine Basin to the Brazil Basin along three pathways: through the Vema and Hunter channels and over the Santos Plateau. The Vema Channel is a conduit for the coldest and densest Antarctic waters to the north. It is a narrow passage between two terraces with a minimum width of 16 km. The propagation of bottom waters in the deep-water Vema Channel occurs as a well-mixed jet. The coldest part of the flow is displaced to the eastern slope of the deep-water channel due to the influence of the bottom Ekman friction. The second core of the flow is observed in the upper part of the channel over its western slope. This jet was also found in the continuation of the AABW flow at the exit from the Vema Channel. We analyze data over the section across the Vema Channel collected in several years of research from the R/V Akademik Sergey Vavilov .

 Antarctic Bottom Water Vema Channel abyssal flows R/V Akademik Sergey Vavilov Antarctic Bottom Water Vema Channel abyssal flows R/V Akademik Sergey Vavilov The work was carried out within the State Task of the Russian Federation 0128-2019-0008; the data analysis was supported by the Russian Science Foundation (grant 21-77-20004).

Frey, D. I., A. N. Novigatsky, et al. (2017a) , Water structure and currents in the Bear Island Trough in July-August, Russian Journal of Earth Sciences, 17, p. ES3003, https://doi.org/10.2205/2017ES000602 Frey, D. I., A. N. Novigatsky, et al. (2017a) , Water structure and currents in the Bear Island Trough in July-August, Russian Journal of Earth Sciences, 17, p. ES3003, https://doi.org/10.2205/2017ES000602 Frey, D. I., V. V. Fomin, et al. (2017b) , New model and field data on estimates of Antarctic Bottom Water flow through the deep Vema Channel, Doklady Earth Sciences, 474, no. 1, p. 561-564, https://doi.org/10.1134/S1028334X17050026 Frey, D. I., V. V. Fomin, et al. (2017b) , New model and field data on estimates of Antarctic Bottom Water flow through the deep Vema Channel, Doklady Earth Sciences, 474, no. 1, p. 561-564, https://doi.org/10.1134/S1028334X17050026 Frey, D. I., E. G. Morozov, et al. (2019a) , Thermohaline structure of Antarctic Bottom Water in the abyssal basins of the South Atlantic, Russian Journal of Earth Sciences, 19, p. ES5005, https://doi.org/10.2205/2019ES000679 Frey, D. I., E. G. Morozov, et al. (2019a) , Thermohaline structure of Antarctic Bottom Water in the abyssal basins of the South Atlantic, Russian Journal of Earth Sciences, 19, p. ES5005, https://doi.org/10.2205/2019ES000679 Frey, D. I., E. G. Morozov, et al. (2019b) , Regional modeling of Antarctic Bottom Water flows in the key passages of the Atlantic, Journal of Geophysical Research: Oceans, 124, no. 11, p. 8414, https://doi.org/10.1029/2019JC015315 Frey, D. I., E. G. Morozov, et al. (2019b) , Regional modeling of Antarctic Bottom Water flows in the key passages of the Atlantic, Journal of Geophysical Research: Oceans, 124, no. 11, p. 8414, https://doi.org/10.1029/2019JC015315 Hogg, N., G. Siedler, W. Zenk (1999) , Circulation and variability at the southern boundary of the Brazil Basin, J. Phys. Oceanogr., 29, p. 145-157, https://doi.org/10/dxw7bm Hogg, N., G. Siedler, W. Zenk (1999) , Circulation and variability at the southern boundary of the Brazil Basin, J. Phys. Oceanogr., 29, p. 145-157, https://doi.org/10/dxw7bm Johnson, D. A., S. E. McDowell, et al. (1976) , Abyssal topography, nephelometry, currents, and benthic boundary layer structure in the Vema Channel, J. Geophys. Res. Oceans, 81, p. 5771-5786, https://doi.org/10.1029/JC081i033p05771 Johnson, D. A., S. E. McDowell, et al. (1976) , Abyssal topography, nephelometry, currents, and benthic boundary layer structure in the Vema Channel, J. Geophys. Res. Oceans, 81, p. 5771-5786, https://doi.org/10.1029/JC081i033p05771 Johnson, G. C. (2008) , Quantifying Antarctic Bottom Water and North Atlantic Deep Water volumes, J. Geophys. Res. Oceans, 113, p. C05027, https://doi.org/10.1029/2007JC004477 Johnson, G. C. (2008) , Quantifying Antarctic Bottom Water and North Atlantic Deep Water volumes, J. Geophys. Res. Oceans, 113, p. C05027, https://doi.org/10.1029/2007JC004477 Jungclaus, J., M. Vanicek (1999) , Frictionally modified flow in a deep ocean channel: Application to the Vema Channel, J. Geophys. Res. Oceans, 104, no. C9, p. 21,123-21,136, https://doi.org/10.1029/1998JC900055 Jungclaus, J., M. Vanicek (1999) , Frictionally modified flow in a deep ocean channel: Application to the Vema Channel, J. Geophys. Res. Oceans, 104, no. C9, p. 21,123-21,136, https://doi.org/10.1029/1998JC900055 Lumpkin, R., K. Speer (2007) , Global ocean meridional overturning, J. Phys. Oceanogr., 37, p. 2550-2562, https://doi.org/10.1175/JPO3130.1 Lumpkin, R., K. Speer (2007) , Global ocean meridional overturning, J. Phys. Oceanogr., 37, p. 2550-2562, https://doi.org/10.1175/JPO3130.1 Mantyla, A. W., J. L. Reid (1983) , Abyssal characteristics of the World Ocean waters, Deep-Sea Res. I, 30, no. 8, p. 805-833, https://doi.org/10.1016/0198-0149(83)90002-X Mantyla, A. W., J. L. Reid (1983) , Abyssal characteristics of the World Ocean waters, Deep-Sea Res. I, 30, no. 8, p. 805-833, https://doi.org/10.1016/0198-0149(83)90002-X McDonagh, E. L., M. Arhan, K. J. Heywood (2002) , On the circulation of bottom water in the region of the Vema, Channel Deep-Sea Res. I, 49, p. 1119-1139, https://doi.org/10.1016/S0967-0637(02)00016-X McDonagh, E. L., M. Arhan, K. J. Heywood (2002) , On the circulation of bottom water in the region of the Vema, Channel Deep-Sea Res. I, 49, p. 1119-1139, https://doi.org/10.1016/S0967-0637(02)00016-X Morozov, E. G., A. N. Demidov, R. Yu. Tarakanov (2008) , Transport of Antarctic Waters in the deep channels of the Atlantic Ocean, Doklady Earth Sciences, 423, no. 8, p. 1286-1289, https://doi.org/10.1134/S1028334X08080230 Morozov, E. G., A. N. Demidov, R. Yu. Tarakanov (2008) , Transport of Antarctic Waters in the deep channels of the Atlantic Ocean, Doklady Earth Sciences, 423, no. 8, p. 1286-1289, https://doi.org/10.1134/S1028334X08080230 Morozov, E. G., A. N. Demidov, et al. (2010) , Abyssal Channels in the Atlantic Ocean: Water Structure and Flows, 266 pp., Springer, Dordrecht, https://doi.org/10.1007/978-90-481-9358-5 Morozov, E. G., A. N. Demidov, et al. (2010) , Abyssal Channels in the Atlantic Ocean: Water Structure and Flows, 266 pp., Springer, Dordrecht, https://doi.org/10.1007/978-90-481-9358-5 Morozov, E. G., R. Yu. Tarakanov, et al. (2018) , Currents and water structure north of the Vema Channel, Russian Journal of Earth Sciences, 18, p. ES5006, https://doi.org/10.2205/2018ES000630 Morozov, E. G., R. Yu. Tarakanov, et al. (2018) , Currents and water structure north of the Vema Channel, Russian Journal of Earth Sciences, 18, p. ES5006, https://doi.org/10.2205/2018ES000630 Morozov, E. G., D. I. Frey, R. Y. Tarakanov (2020a) , Flow of Antarctic Bottom Water from the Vema Channel, Geoscience Letters, 7, https://doi.org/10.1186/s40562-020-00166-4 Morozov, E. G., D. I. Frey, R. Y. Tarakanov (2020a) , Flow of Antarctic Bottom Water from the Vema Channel, Geoscience Letters, 7, https://doi.org/10.1186/s40562-020-00166-4 Morozov, E. G., D. I. Frey, et al. (2020b) , The extreme northern jet of the Antarctic Circumpolar Current, Russian Journal of Earth Sciences, 20, p. ES5004, https://doi.org/10.2205/2020ES000717 Morozov, E. G., D. I. Frey, et al. (2020b) , The extreme northern jet of the Antarctic Circumpolar Current, Russian Journal of Earth Sciences, 20, p. ES5004, https://doi.org/10.2205/2020ES000717 Orsi, A. H., G. C. Johnsson, J. L. Bullister (1999) , Circulation, mixing, and production of Antarctic Bottom Water, Progress in Oceanogr., 43, p. 55-109, https://doi.org/10.1016/S0079-6611(99)00004-X Orsi, A. H., G. C. Johnsson, J. L. Bullister (1999) , Circulation, mixing, and production of Antarctic Bottom Water, Progress in Oceanogr., 43, p. 55-109, https://doi.org/10.1016/S0079-6611(99)00004-X Speer, K. G., W. Zenk (1993) , The flow of Antarctic Bottom water into the Brazil Basin, J. Phys. Oceanogr., 23, p. 2667-2682, https://doi.org/10/b6k2sk Speer, K. G., W. Zenk (1993) , The flow of Antarctic Bottom water into the Brazil Basin, J. Phys. Oceanogr., 23, p. 2667-2682, https://doi.org/10/b6k2sk Tarakanov, R. Y., E. G. Morozov, D. I. Frey (2020) , Hydraulic continuation of the abyssal flow from the Vema Channel in the southwestern part of the Brazil Basin, J. Geophys. Res. Oceans, 125, p. e2020JC016232, https://doi.org/10.1029/2020JC016232 Tarakanov, R. Y., E. G. Morozov, D. I. Frey (2020) , Hydraulic continuation of the abyssal flow from the Vema Channel in the southwestern part of the Brazil Basin, J. Geophys. Res. Oceans, 125, p. e2020JC016232, https://doi.org/10.1029/2020JC016232 Wienders, N., M. Arhan, H. Mercier (2000) , Circulation at the western boundary of the South and Equatorial Atlantic: Exchanges with the ocean interior, J. Mar. Res., 58, p. 1007-1039, https://doi.org/10.1357/002224000763485782 Wienders, N., M. Arhan, H. Mercier (2000) , Circulation at the western boundary of the South and Equatorial Atlantic: Exchanges with the ocean interior, J. Mar. Res., 58, p. 1007-1039, https://doi.org/10.1357/002224000763485782 Zenk, W., N. G. Hogg (1996) , Warming trend in Antarctic Bottom Water flowing into the Brazil Basin, Deep-Sea Res. I, 43, no. 9, p. 1461-1473, https://doi.org/10.1016/S0967-0637(96)00068-4 (in Russian) Zenk, W., N. G. Hogg (1996) , Warming trend in Antarctic Bottom Water flowing into the Brazil Basin, Deep-Sea Res. I, 43, no. 9, p. 1461-1473, https://doi.org/10.1016/S0967-0637(96)00068-4 (in Russian)