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  Unsupervised classification identifies coherent thermohaline structures in the Weddell Gyre region

Jones, D., Sonnewald, M., Zhou, S., Hausmann, U., Meijers, A., Rosso, I., Boehme, L., Meredith, M., Naveira Garabato, A. (2023): Unsupervised classification identifies coherent thermohaline structures in the Weddell Gyre region, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0136

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016414 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016414_1
Genre: Conference Paper

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 Creators:
Jones, Dani1, Author
Sonnewald, Maike1, Author
Zhou, Shenjie1, Author
Hausmann, Ute1, Author
Meijers, Andrew1, Author
Rosso, Isabella1, Author
Boehme, Lars1, Author
Meredith, Michael1, Author
Naveira Garabato, Alberto1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The Weddell Gyre is a prominent feature of the Southern Ocean and an important component of the planetary climate system; it regulates air-sea exchanges, controls the formation of deep and bottom waters, and hosts upwelling of relatively warm subsurface waters. It is characterised by extremely low sea surface temperatures, ubiquitous sea ice formation, and widespread salt stratification. At present, the remote and often sea-ice-covered Weddell Gyre is one of the most poorly-sampled regions of the global ocean, highlighting the need to extract as much information as possible from existing observations. Here, we apply a profile classification model (PCM), which is an unsupervised classification technique, to a Weddell Gyre profile dataset to identify coherent regimes in temperature and salinity. We find that, despite not being given any positional information, PCM identifies four spatially coherent thermohaline domains that can be described as follows: (1) a circumpolar class, (2) a transition region between the circumpolar waters and the Weddell Gyre, (3) a gyre edge class, and (4) a gyre core class. We also find signatures of Circumpolar Deep Water inflow and the presence of Weddell-Scotia Confluence waters. Compared with the circumpolar class, the transition class is relatively more affected by brine rejection from sea ice formation and the associated vertical mixing. By using PCM to examine the structure of the Weddell Gyre, we show that PCM can act as a useful hypothesis generation tool and a complement to existing expertise-driven approaches for characterising oceanographic data.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-0136
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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