Ocean Science
Ocean Science
OS
Articles | Volume 21, issue 1
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

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Cited articles

Aoki, S., Bindoff, N. L., and Church, J. A.: Interdecadal water mass changes in the Southern Ocean between 30°E and 160°E, Geophys. Res. Lett., 32, L07607, https://doi.org/10.1029/2004GL022220, 2005. a, b
Aoki, S., Katsumata, K., Hamaguchi, M., Noda, A., Kitade, Y., Shimada, K., Hirano, D., Simizu, D., Aoyama, Y., Doi, K., and Nogi, Y.: Freshening of Antarctic Bottom Water Off Cape Darnley, East Antarctica, J. Geophys. Res.-Oceans, 125, e2020JC016374, https://doi.org/10.1029/2020JC016374, 2020a. a, b
Aoki, S., Yamazaki, K., Hirano, D., Katsumata, K., Shimada, K., Kitade, Y., Sasaki, H., and Murase, H.: Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s, Sci. Rep., 10, 14415, https://doi.org/10.1038/s41598-020-71290-6, 2020b. a
Bryden, H. L., McDonagh, E. L., and King, B. A.: Changes in Ocean Water Mass Properties: Oscillations or Trends?, Science, 300, 2086–2088, https://doi.org/10.1126/science.1083980, 2003. a, b
Bullister, J. L. and Warner, M. J.: Atmospheric Histories (1765–2022) for CFC-11, CFC-12, CFC-113, CCl4, SF6 and N2O (NCEI Accession 0164584), NOAA National Centers for Environmental Information, https://doi.org/10.3334/cdiac/otg.cfc_atm_hist_2015, 2017. a
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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.
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