Multibeam bathymetry data of the western part of the Romanche Trench (Equatorial Atlantic)

Капустина, М. В.; Dorokhov, Dmitry; Sivkov, Vadim

doi:10.1016/j.dib.2021.107198

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…First of all, the analysis of a high‐resolution DTM compilation based on a series of multibeam surveys revealed the intricate structure of the sill between two deepest basins of the Romanche FZ, namely the Vavilov and Vema deeps. Previously, a series of studies pointed out the importance of complex bathymetry in the Romanche FZ (Kapustina et al., 2021; Mercier and Speer, 1998; Tarakanov et al., 2018; van Haren et al., 2014). As for the studied sill at 19.5°W, no reliable information is available in the global bathymetry databases; even the modern GEBCO 2022 version (GEBCO, 2022) does not resolve all three passages for AABW jets over the sill.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, a high‐resolution digital terrain model (DTM) for the entire Romanche FZ has been developed. A detailed DTM for the western part of the Romanche FZ was generated based on data from the cruise of the R/V Akademik Nikolaj Strakhov (Kapustina et al., 2021). According to the DTM, the sill located at 1.1°S, 22.5°W (Tarakanov et al., 2013) serves as the AABW entrance from the Brazil Basin to the fracture zone and further east, into the Vavilov and Vema deeps.…”

Section: Introductionmentioning

confidence: 99%

“…According to the DTM, the sill located at 1.1°S, 22.5°W (Tarakanov et al., 2013) serves as the AABW entrance from the Brazil Basin to the fracture zone and further east, into the Vavilov and Vema deeps. The maximum depth of the sill is 4,575 m (Kapustina et al., 2021). The Main Sill in the Romanche FZ is located at 13.68°W (13°41’W) with a minimum depth of 4,350 m (Mercier et al., 1994).…”

Section: Introductionmentioning

confidence: 99%

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Multiple Abyssal Jets Flowing Into the Vema Deep, Romanche Fracture Zone

et al. 2023

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Strong acceleration of abyssal flows in narrow deep‐water channels and fracture zones is a key feature of bottom circulation in the Atlantic Ocean. In the Equatorial Atlantic, these bottom currents transport Antarctic Bottom Water (AABW) over the Mid‐Atlantic Ridge from west to east. The main pathway for Antarctic waters in this region is the Romanche Fracture Zone. The deepest point of this fracture zone is the Vema Deep; its maximum depth based on the published data is 7,856 m. This deep basin is filled by waters of Antarctic origin overflowing a sill in a narrow channel. During the expedition on the R/V Akademik Ioffe (August 2022), we revealed a strong flow in the middle part of the Romanche Fracture Zone and collected new data on thermohaline and kinematic structures of this gravity current. Our survey is the first observational evidence of the intense flow into the Vema Deep. At the sill, the flow splits into branches flowing through three distinct channels of intricate configuration located in the southern transform valley of the fracture zone. The northern channel is proved to be the main pathway of the coldest and densest bottom waters to the Vema Deep. We also found that vertical structure of the flow is presented by two individual jets, namely the deep and bottom jets. The total transport of AABW through the Romanche Fracture Zone at this location was estimated at 1.40 Sv; the velocities exceeding 10 cm/s were found at depths greater than 5,000 m.

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