Multi-jet Structure of the Antarctic Circumpolar Current

Tarakanov, R. Yu.

doi:10.1007/978-3-030-78927-5_2

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The ACC was initially characterized as a multi-jet structure, with three primary fronts-the Subantarctic Front (SAF), the Polar Front (PF), and the Southern ACC Front (SACCF)and two large gyres-the Ross and Weddell gyres (Orsi et al, 1995). However, subsequent research suggests that the ACC is a more complex structure, with additional jets beyond the three classical ones and a third unnamed gyre located between 80 °E and 90 °E (Sokolov and Rintoul, 2009a;Tarakanov, 2021).…”

Section: Introductionmentioning

confidence: 99%

Updated geostrophic circulation and volume transport from satellite data in the Southern Ocean

et al. 2023

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Introduction: A geodetic estimation of the surface geostrophic currents can be obtained from satellite data by combining sea surface height measurements obtained from altimetry missions with geoid data from gravity missions. These surface geostrophic currents serve as a reference for inferring a comprehensive three-dimensional (3D) geostrophy by propagating them downwards using temperature and salinity profiles.Methods: In this work, we revisit this problem for the Southern Ocean, estimating the 3D geostrophy near full depth in 41 layers, with a 1° spatial resolution and monthly temporal resolution, covering the 12 years from 2004 to 2015. We analyze the obtained 3D geostrophy over the Southern Ocean region, where the Antarctic Circumpolar Current (ACC) and its several fronts are depicted, as well as other major currents such as the Agulhas Current, the Brazil-Malvinas Current, or the East Australian Current. From the 3D geostrophic currents, we also estimate the associated water volume transport (VT) and present the results for the ACC and the Drake Passage in the context of existing literature.Results: Our analysis yields a mean VT estimate of 15.9 ± 0.1 Sv per 1° cell within the ACC region and 149.2 ± 2.2 Sv for the Drake Passage ([60.5°S, 54.5°S] x [303.5°E]). Importantly, our study includes a comprehensive validation of the results. The spatial resolution of our space-data-based approach enables us to provide VT estimates for various paths followed in the different in situ campaigns at the Drake Passage, thereby validating our findings.Discussion: The analysis demonstrates a remarkable agreement across different measurement locations, reconciling the differences in estimates reported from different campaigns. Moreover, we have estimated the barotropic and baroclinic components of the currents and their associated VT.

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Section: Introductionmentioning

confidence: 99%

Updated geostrophic circulation and volume transport from satellite data in the Southern Ocean

et al. 2023

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A Geodetic Analysis of the Volume Transport in the ACC Region Based on Satellite Data

Vargas-Alemañy,

Vigo,

García-García

et al. 2024

International Association of Geodesy Symposia

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Geostrophic currents, driven by the Coriolis and pressure gradient forces, are crucial for understanding ocean circulation. The Antarctic Circumpolar Current (ACC) in the Southern Ocean, which surrounds Antarctica, has a significant global impact, and its volume transport (VT) remains a challenge to measure. We use satellite data, combining altimetry and gravity satellite missions, to estimate VT within the ACC region. Our study provides a comprehensive spatial and temporal analysis, including both barotropic and baroclinic VT components. The spatial analysis reveals a mean VT of 210.44 ± 3.4 Sv for the entire study area, with maxima near critical choke points. Focusing on the time-varying component, we identify a mean VT of 15.86 ± 0.05 Sv per 1° grid cell, a linear trend of −0.007 ± 0.002 Sv per month, and significant seasonal and biannual signals. The baroclinic component drives low-frequency variability, while the barotropic component controls high-frequency variability. We propose a specific ACC zonal VT of 201.63 ± 0.71 Sv. We validate our results with in situ measurements from the Drake Passage. In conclusion, our satellite-based approach provides valuable insights into the ACC VT. This methodological extension improves our understanding of the ocean circulation dynamics of the ACC and demonstrates the utility and robustness of satellite data in oceanographic research.

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Pelagic ciliate (Ciliophora) communities in the Southern Ocean: Bioindicator to water mass, habitat suitability classification and potential response to global warming

Wang,

Wei

et al. 2023

Progress in Oceanography

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Multi-jet Structure of the Antarctic Circumpolar Current

Cited by 4 publications

References 17 publications

Updated geostrophic circulation and volume transport from satellite data in the Southern Ocean

Updated geostrophic circulation and volume transport from satellite data in the Southern Ocean

A Geodetic Analysis of the Volume Transport in the ACC Region Based on Satellite Data

Pelagic ciliate (Ciliophora) communities in the Southern Ocean: Bioindicator to water mass, habitat suitability classification and potential response to global warming

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