Seismic stratigraphy of the Central Basin in northwestern Ross Sea slope and rise, Antarctica: Clues to the late Cenozoic ice-sheet dynamics and bottom-current activity

Kim, Sookwan; Santis, Laura De; Hong, Jong Kuk; Cottlerle, Diego; Petronio, Lorenzo; Colizza, Ester; Kim, Young-Gyun; Kang, Seung‐Goo; Kim, Hyoung Jun; Kim, Suhwan; Wardell, N.; Geletti, R.; Bergamasco, A.; McKay, Robert; Jin, Young Keun; Kang, Sung‐Ho

doi:10.1016/j.margeo.2017.10.013

Cited by 34 publications

(30 citation statements)

References 68 publications

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“…In some cases, crossing lines are not available; the remoteness of Antarctic water and the presence of sea ice prevents the easy collection of new site survey data. New MCS Profiles KSL14-02 and KSL14-04 (Kim et al, 2018) were collected in February 2013 and in 2015 by the Korea Polar Research Institute (KOPRI) with the aim of providing cross-lines for several proposed sites. Another SCS survey cruise Figure F7.…”

Section: Site Survey Datamentioning

confidence: 99%

“…Micropaleontological, geochemical, and sedimentological records from drill cores from all Expedition 374 sites will provide reconstructions of changing regional surface and seafloor conditions (e.g., sea ice, surface stratification, sea-surface temperatures [SSTs], polynya mixing, glacial meltwater discharge, nutrient uptake, and supercooling of dense water by ice shelves) proximal to the AISs (e.g., Shevenell et al, 2011;McKay et al, 2012a;Houben et al, 2013;Levy et al, 2016;Sangiorgi et al, 2018) and thus AABW (and SCW) formation. Additionally, downslope currents resulting from the transfer of High-Salinity Shelf Water into the abyssal ocean can also be assessed (and distinguished from ASC flow) by integrated lithofacies analysis, geochemistry, micropaleontology, and seismic-reflection profiles (e.g., Hepp et al, 2006;Lucchi and Rebesco, 2007;Caburlotto et al, 2010;Kim et al, 2018) at Sites U1523-U1525. Carbonate-based paleotemperature and carbonate ion proxies (e.g., foraminiferal Mg/Ca, Li/Ca, U/Ca, and clumped isotopes) will also be applied where appropriate species are preserved (see Objective 2).…”

Section: Assess the Role Of Oceanic Forcing (Eg Sea Level And Tempmentioning

confidence: 99%

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Ross Sea West Antarctic Ice Sheet History

McKay¹,

Santis²,

Kulhanek³

et al. 2019

Proceedings of the International Ocean Discovery Program

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The marine-based West Antarctic Ice Sheet (WAIS) is currently locally retreating because of shifting wind-driven oceanic currents that transport warm waters toward the ice margin, resulting in ice shelf thinning and accelerated mass loss. Previous results from geologic drilling on Antarctica's continental margins show significant variability in ice sheet extent during the late Neogene and Quaternary. Climate and ice sheet models indicate a fundamental role for oceanic heat in controlling ice sheet variability over at least the past 20 My. Although evidence for past ice sheet variability is available from ice-proximal marine settings, sedimentary sequences from the continental shelf and rise are required to evaluate the extent of past ice sheet variability and the associated forcings and feedbacks. International Ocean Discovery Program Expedition 374 drilled a latitudinal and depth transect of five sites from the outer continental shelf to rise in the central Ross Sea to resolve Neogene and Quaternary relationships between climatic and oceanic change and WAIS evolution. The Ross Sea was targeted because numerical ice sheet models indicate that this sector of Antarctica responds sensitively to changes in ocean heat flux. Expedition 374 was designed for optimal data-model integration to enable an improved understanding of Antarctic Ice Sheet (AIS) mass balance during warmer-than-present climates (e.g., the Pleistocene "super interglacials," the mid-Pliocene, and the Miocene Climatic Optimum). The principal goals of Expedition 374 were to • Evaluate the contribution of West Antarctica to far-field ice volume and sea level estimates;• Reconstruct ice-proximal oceanic and atmospheric temperatures to quantify past polar amplification; • Assess the role of oceanic forcing (e.g., temperature and sea level) on AIS variability; • Identify the sensitivity of the AIS to Earth's orbital configuration under a variety of climate boundary conditions; and • Reconstruct Ross Sea paleobathymetry to examine relationships between seafloor geometry, ice sheet variability, and global climate.To achieve these objectives, postcruise studies will• Use data and models to reconcile intervals of maximum Neogene and Quaternary ice advance and retreat with far-field records of eustatic sea level; • Reconstruct past changes in oceanic and atmospheric temperatures using a multiproxy approach; • Reconstruct Neogene and Quaternary sea ice margin fluctuations and correlate these records to existing inner continental shelf records; • Examine relationships among WAIS variability, Earth's orbital configuration, oceanic temperature and circulation, and atmospheric pCO 2 ; and • Constrain the timing of Ross Sea continental shelf overdeepening and assess its impact on Neogene and Quaternary ice dynamics.Expedition 374 departed from Lyttelton, New Zealand, in January 2018 and returned in March 2018. We recovered 1292.70 m of R.M. McKay et al. Expedition 374 summary IODP Proceedings 2 V o l u m e 3 7 4

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Section: Site Survey Datamentioning

confidence: 99%

Section: Assess the Role Of Oceanic Forcing (Eg Sea Level And Tempmentioning

confidence: 99%

Ross Sea West Antarctic Ice Sheet History

McKay¹,

Santis²,

Kulhanek³

et al. 2019

Proceedings of the International Ocean Discovery Program

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“…Our current understanding of the paleocryosphere and paleo‐ocean circulation hinges on our knowledge of the sedimentation patterns offshore Antarctica. They archive local and regional glacial sediment transport mechanisms (e.g., Close, 2010; Donda et al, 2008, 2020; Gohl, 2012; Hochmuth & Gohl, 2019; Huang & Jokat, 2016; Kim et al, 2018; Kuvaas et al, 2005) and bottom‐water activities that can be related to glacial conditions (e.g., Huang et al, 2017; Rebesco et al, 1996; Uenzelmann‐Neben, 2006; Uenzelmann‐Neben & Gohl, 2012). The quantity of glacially derived sedimentation between different glacial outlets through time allows investigation of regional to local trends and developments, including issues to be addressed such as the following: How much sediment has been eroded from the continent? How active is the sediment transport at outlet glaciers in specific regions? How does the transport and deposition of sediment change through time around Antarctica and into the Southern Ocean? …”

Section: Introductionmentioning

confidence: 99%

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

Hochmuth

Gohl

Leitchenkov

et al. 2020

Geochem Geophys Geosyst

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The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the climate of the entire planet. Although the depths of the ocean floor have been recognized as an important factor in climate and paleoclimate models, appropriate paleobathymetric models including a detailed analysis of the sediment cover are not available. Here we utilize more than 40 years of seismic reflection data acquisition along the margins of Antarctica and its conjugate margins, along with multiple drilling campaigns by the International Ocean Discovery Program (IODP) and its predecessor programs. We combine and update the seismic stratigraphy across the regions of the Southern Ocean and calculate ocean‐wide paleobathymetry grids via a backstripping method. We present a suite of high‐resolution paleobathymetric grids from the Eocene‐Oligocene Boundary to modern times. The grids reveal the development of the Southern Ocean from isolated basins to an interconnected ocean affected by the onset and vigor of an Antarctic Circumpolar Current, as well as the glacial sedimentation and erosion of the Antarctic continent. The ocean‐wide comparison through time exposes patterns of ice sheet development such as switching of glacial outlets and the change from wet‐based to dry‐based ice sheets. Ocean currents and bottom‐water production interact with the sedimentation along the continental shelf and slope and profit from the opening of the ocean gateways.

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“…In some cases, crossing lines are not available, and the remoteness of Antarctic water and presence of sea ice prevent the easy collection of new site survey data. New MCS Profiles KSL14-02 and KSL14-04 (Kim et al, 2018) were collected in February 2013 and in 2015 by the Korea Polar Research Institute (KOPRI) with the aim of providing cross-lines for several proposed sites. Another SCS survey cruise was conducted in 2017 (EU/FP7 EUROFLEETS2 ANTSSS project and Programma Nazionale di Ricerche in Antartide WHISPERS and ODYSSEA projects) with the aim to collect additional cross-lines of the proposed sites and identify alternate sites.…”

Section: Site Survey Datamentioning

confidence: 99%

“…Micropaleontological, geochemical, and sedimentologic records from drill cores from all Expedition 374 sites will provide reconstructions of changing regional surface and seafloor conditions (e.g., sea ice, surface stratification, sea-surface temperatures [SSTs], polynya mixing, glacial meltwater discharge, nutrient uptake, and supercooling of dense waters by ice shelves) proximal to the AISs (e.g., Shevenell et al, 2011;McKay et al, 2012a;Houben et al, 2013;Levy et al, 2016;Sangiorgi et al, 2018) and thus AASW (and SCW) formation. Additionally, downslope currents resulting from the transfer of High-Salinity Shelf Water into the abyssal ocean can also be assessed (and distinguished from ASC flow) by integrated lithofacies analysis, geochemistry, micropaleontology, and seismic profiles (e.g., Hepp et al, 2006;Lucchi and Rebesco, 2007;Caburlotto et al, 2010;Kim et al, 2018) at Sites U1523-U1525. Carbonate-based paleotemperature and carbonate ion proxies (e.g., foraminiferal Mg/Ca, Li/Ca, U/Ca, and clumped isotopes) will also be applied where appropriate species are preserved (see Objective 2).…”

Section: Assess the Role Of Oceanic Forcing (Eg Sea Level And Tempmentioning

confidence: 99%

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McKay¹,

Santis²,

Kulhanek³

et al. 2018

International Ocean Discovery Program Preliminary Report

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we could not recover sediment cores from proposed Site RSCR-19A, which was targeted to obtain a high-fidelity, continuous record of upper Neogene and Quaternary pelagic/hemipelagic sedimentation. Despite our failure to recover a shelf-to-rise transect for the Miocene, a continental shelf-to-rise transect for the Pliocene to Pleistocene interval is possible through comparison of the highquality records from Site U1522 with those from Site U1525 and legacy cores from the Antarctic Geological Drilling Project (AN-DRILL).

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Seismic stratigraphy of the Central Basin in northwestern Ross Sea slope and rise, Antarctica: Clues to the late Cenozoic ice-sheet dynamics and bottom-current activity

Cited by 34 publications

References 68 publications

Ross Sea West Antarctic Ice Sheet History

Ross Sea West Antarctic Ice Sheet History

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

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