Hydrographic section along 55°&thinsp;E in the Indian and Southern oceans

Katsumata, Katsuro; Aoki, Shigeru; Ohshima, Kay I.; Yamamoto-Kawai, Michiyo

doi:https://doi.org/10.5194/os-21-419-2025

Articles | Volume 21, issue 1

https://doi.org/10.5194/os-21-419-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/os-21-419-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 1

Research article

|

12 Feb 2025

Research article |

| 12 Feb 2025

Hydrographic section along 55° E in the Indian and Southern oceans

Katsuro Katsumata, Shigeru Aoki, Kay I. Ohshima, and Michiyo Yamamoto-Kawai

Data sets

49NZ20191229 from CCHDO Hydrographic Data Archive CCHDO (CLIVAR and Carbon Hydrographic Data Office) https://doi.org/10.6075/J0CCHAM8

Scripps Argo trajectory-based velocity product 2001-01 to 2020-12 N. V. Zilberman et al. https://doi.org/10.6075/J0KD1Z35

CTD and bottle data from KH-20-1 cruise in the 2020/21 season from the region around Cape Darnley, 0.10 K. I. Ohshima and K. Katsumata https://ads.nipr.ac.jp/dataset/A20240613-001

CTD and bottle data from KH-19-1 cruise in the 2019/20 season from the region around Cape Darnley, 0.10 K. I. Ohshima et al. https://ads.nipr.ac.jp/dataset/A20240612-002

World Ocean Database 2023 A. V. Mishonov et al. https://doi.org/10.25923/z885-h264

Global Ocean Gridded L 4 Sea Surface Heights And Derived Variables Reprocessed 1993 Ongoing E.U. Copernicus Marine Service Information https://doi.org/10.48670/moi-00148

Short summary

Ship-based observations provide data of seawater properties like temperature, salinity, nutrients, and various gases, but some important world oceans have still not been covered. A voyage in 2019/20 in the southwest Indian Ocean along approximately 55° E from 30° S to Antarctica attempted to fill one such data-sparse region. The measured cross section of the Antarctic Circumpolar Current and accompanying eddies demonstrates various oceanic behaviours including fronts and eddy mixing.