The International Bathymetric Chart of the Southern Ocean Version 2

Dorschel, Boris; Hehemann, Laura; Viquerat, Sacha; Warnke, Fynn; Dreutter, Simon; Tenberge, Yvonne Schulze; Accettella, Daniela; An, Lu; Barrios, Felipe; Bazhenova, E.; Black, Jenny; Bohoyo, Fernando; Davey, C.N.; Santis, Laura De; Dotti, Carlota Escutia; Frémand, Alice C.; Fretwell, Peter T.; Gales, J. A.; Gao, Jinyao; Gasperini, Luca; Greenbaum, J. S.; Jencks, Jennifer; Hogan, Kelly; Hong, Jong Kuk; Jakobsson, Martin; Jensen, Laura; Kool, Johnathan; Larin, S. S.; Larter, Robert D; Leitchenkov, G. L.; Loubrieu, B.; Mackay, Kevin; Mayer, Larry A.; Millan, Romain; Morlighem, Mathieu; Navidad, Francisco; Nitsche, F. O.; Nogi, Yoshifumi; Pertuisot, Cécile; Post, Alix; Pritchard, Hamish D.; Purser, Autun; Rebesco, Michele; Rignot, Eric; Roberts, Jason L.; Rovere, Marzia; Ryzhov, Ivan; Sauli, Chiara; Schmitt, Thierry; Silvano, Alessandro; Smith, J. A.; Snaith, Helen; Tate, Alex; Tinto, Kirsty; Vandenbossche, Philippe; Weatherall, Pauline; Wintersteller, Paul; Yang, Chunguo; Zhang, Tao; Arndt, Jan Erik

doi:10.1038/s41597-022-01366-7

Cited by 39 publications

(48 citation statements)

References 33 publications

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“…We then used the 'mgcv' package 29,30 to fit an additive model of the observed fin whale groups per segment, off set by the log of the effectively searched area per segment, to a smoothed interaction of x and y (projected longitude and latitude values of segment midpoints, respectively) and combinations of x and y with water depth (IBCSO v2 31 ) and derived properties TPI (topographic position index) 32 , TRI (terrain ruggedness index) 32 , slope and aspect. TPI, TRI, slope and aspect were calculated from the depth raster using the 'raster' package 33 .…”

Section: Analysesmentioning

confidence: 99%

Return of large fin whale feeding aggregations to historical whaling grounds in the Southern Ocean

Herr

Viquerat

Devas³

et al. 2022

Sci Rep

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Fin whales (Balaenoptera physalus quoyi) of the Southern Hemisphere were brought to near extinction by twentieth century industrial whaling. For decades, they had all but disappeared from previously highly frequented feeding grounds in Antarctic waters. Our dedicated surveys now confirm their return to ancestral feeding grounds, gathering at the Antarctic Peninsula in large aggregations to feed. We report on the results of an abundance survey and present the first scientific documentation of large fin whale feeding aggregations at Elephant Island, Antarctica, including the first ever video documentation. We interpret high densities, re-establishment of historical behaviours and the return to ancestral feeding grounds as signs for a recovering population. Recovery of a large whale population has the potential to augment primary productivity at their feeding grounds through the effects of nutrient recycling, known as 'the whale pump'. The recovery of fin whales in that area could thus restore ecosystem functions crucial for atmospheric carbon regulation in the world's most important ocean region for the uptake of anthropogenic CO2.

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Section: Analysesmentioning

confidence: 99%

Return of large fin whale feeding aggregations to historical whaling grounds in the Southern Ocean

Herr

Viquerat

Devas³

et al. 2022

Sci Rep

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“…The ridge is also visible in the RTopo-1 data set of Timmermann et al [2010] and the more recent IBCSO v2 dataset [Dorschel et al, 2022]. We highlight, though, that there is great uncertainty regarding the actual topography on the continental shelf between the Bellingshausen and Amundsen Seas due to a significant lack of data.…”

Section: Model Detailsmentioning

confidence: 70%

The influence of bathymetry over circulation on the Amundsen Sea continental shelf

Haigh

Holland

Jenkins³

2022

Preprint

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Ice sheets such as Pine Island and Thwaites Glaciers which terminate at their ice shelves in the eastern Amundsen Sea, West Antarctica, are losing mass faster than most others about the continent. The mass loss is due to basal melting, this affected by a deep current thought to be guided by bottom bathymetry that transports warm Circumpolar Deep Water (CDW) from the continental shelf break towards the ice shelves. This current and associated heat transport are controlled by the near-surface winds that vary on a range of timescales due to both anthropogenic and natural effects. In this study we use idealised models to reproduce essential features of the Amundsen Sea circulation and heat transport. The aim is to elucidate the role of bathymetric features in shaping the circulation and in enabling heat transport from the deep ocean onto the continental shelf. Bathymetric variations along the continental slope enhance on-shelf heat transport by inducing breaks in the Antarctic Slope Front that separates off-shelf CDW from the colder, fresher shelf waters. The idealised model results imply that a ridge that blocks deep westward inflow from the Bellingshausen Sea leads to the existence of a deep cyclonic circulation on the shelf. Part of this circulation is an eastward undercurrent that flows along the continental shelf break. The broader cyclonic circulation transports heat that has been recently fluxed onto the shelf towards the south. These fundamental investigations will help refine the aims of future fieldwork and modelling.

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“…The data (sets) used for the illustrations in some figures are referenced in the figure captions: bathymetry (water depth) in Fig. 1 (Dorschel et al, 2022); bathymetry in Figs. 2a and…”

Section: Discussionmentioning

confidence: 99%

Reviews and syntheses: A framework to observe, understand and project ecosystem response to environmental change in the East Antarctic Southern Ocean

Gutt

Arndt²,

Barnes³

et al. 2022

Biogeosciences

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Abstract. Systematic long-term studies on ecosystem dynamics are largely lacking from the East Antarctic Southern Ocean, although it is well recognized that they are indispensable to identify the ecological impacts and risks of environmental change. Here, we present a framework for establishing a long-term cross-disciplinary study on decadal timescales. We argue that the eastern Weddell Sea and the adjacent sea to the east, off Dronning Maud Land, is a particularly well suited area for such a study, since it is based on findings from previous expeditions to this region. Moreover, since climate and environmental change have so far been comparatively muted in this area, as in the eastern Antarctic in general, a systematic long-term study of its environmental and ecological state can provide a baseline of the current situation, which will be important for an assessment of future changes from their very onset, with consistent and comparable time series data underpinning and testing models and their projections. By establishing an Integrated East Antarctic Marine Research (IEAMaR) observatory, long-term changes in ocean dynamics, geochemistry, biodiversity, and ecosystem functions and services will be systematically explored and mapped through regular autonomous and ship-based synoptic surveys. An associated long-term ecological research (LTER) programme, including experimental and modelling work, will allow for studying climate-driven ecosystem changes and interactions with impacts arising from other anthropogenic activities. This integrative approach will provide a level of long-term data availability and ecosystem understanding that are imperative to determine, understand, and project the consequences of climate change and support a sound science-informed management of future conservation efforts in the Southern Ocean.

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The International Bathymetric Chart of the Southern Ocean Version 2

Cited by 39 publications

References 33 publications

Return of large fin whale feeding aggregations to historical whaling grounds in the Southern Ocean

Return of large fin whale feeding aggregations to historical whaling grounds in the Southern Ocean

The influence of bathymetry over circulation on the Amundsen Sea continental shelf

Reviews and syntheses: A framework to observe, understand and project ecosystem response to environmental change in the East Antarctic Southern Ocean

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