Calcareous nannofossil evidence for Marine Isotope Stage 31 (1Ma) in Core AND-1B, ANDRILL McMurdo Ice Shelf Project (Antarctica)

Villa, Giuliana; Persico, Davide; Wise, Sherwood W.; Gadaleta, A.

doi:10.1016/j.gloplacha.2009.12.003

Cited by 21 publications

(18 citation statements)

References 46 publications

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“…The observation that Lake El'gygytgyn appears warm during MIS 32 echoes recent findings from high southern latitudes (Teitler et al, 2015), where the majority of research pertaining to MIS 31 explicitly has been carried out to date (DeConto et al, 2012;Maiorano et al, 2009;McKay et al, 2012;Villa et al, 2012Villa et al, , 2008. Results from the ANDRILL project (McKay et al, 2012;Naish et al, 2009;Scherer et al, 2008;Villa et al, 2012) noted the presence of diatomite and presumed open water conditions at the coring site in the Ross Sea (Figure 1), implying a dramatically reduced West Antarctic Ice Sheet (WAIS) during this time. A large-scale reduction in WAIS is further supported by the modeling studies of Pollard and DeConto (2009) and DeConto et al (2012).…”

Section: Global Signature Of Mis 33-31supporting

confidence: 69%

“…It has been identified as a period of extreme warmth in the southern high latitudes (e.g. Maiorano et al, 2009;Teitler et al, 2015) and is also the last time strong proxy evidence is available for a collapse of the West Antarctic Ice Sheet (WAIS) (McKay et al, 2012;Naish et al, 2009;Villa et al, 2012). In the Northern Hemisphere (NH), the vast majority of paleoclimate reconstructions that cover this period are marine sediment records, with notable exceptions being sediments from Lake Baikal (Khursevich et al, 2005) and the Chinese loess archives (Sun et al, 2010).…”

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confidence: 99%

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A high-resolution mid-Pleistocene temperature record from Arctic Lake El'gygytgyn: a 50 kyr super interglacial from MIS 33 to MIS 31?

Wet

Castañeda

DeConto

et al. 2016

Earth and Planetary Science Letters

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Section: Global Signature Of Mis 33-31supporting

confidence: 69%

mentioning

confidence: 99%

A high-resolution mid-Pleistocene temperature record from Arctic Lake El'gygytgyn: a 50 kyr super interglacial from MIS 33 to MIS 31?

Wet

Castañeda

DeConto

et al. 2016

Earth and Planetary Science Letters

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“…We performed an evolutionary spectral and harmonic analysis on each dataset using the Astrochron toolkit in the R software (Meyers, 2014). A detailed methodology is provided in the Supplement, following the Astrochron code of Wanlu et al (2016). This method allows the detection of nonstationary spectra variability within the time series.…”

Section: Spectral Analysesmentioning

confidence: 99%

Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 1: Insights from late Oligocene astronomically paced contourite sedimentation

et al. 2018

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Abstract. Antarctic ice sheet and Southern Ocean paleoceanographic configurations during the late Oligocene are not well resolved. They are however important to understand the influence of high-latitude Southern Hemisphere feedbacks on global climate under CO2 scenarios (between 400 and 750 ppm) projected by the IPCC for this century, assuming unabated CO2 emissions. Sediments recovered by the Integrated Ocean Drilling Program (IODP) at Site U1356, offshore of the Wilkes Land margin in East Antarctica, provide an opportunity to study ice sheet and paleoceanographic configurations during the late Oligocene (26–25 Ma). Our study, based on a combination of sediment facies analysis, magnetic susceptibility, density, and X-ray fluorescence geochemical data, shows that glacial and interglacial sediments are continuously reworked by bottom currents, with maximum velocities occurring during the interglacial periods. Glacial sediments record poorly ventilated, low-oxygenation bottom water conditions, interpreted as resulting from a northward shift of westerly winds and surface oceanic fronts. Interglacial sediments record more oxygenated and ventilated bottom water conditions and strong current velocities, which suggests enhanced mixing of the water masses as a result of a southward shift of the polar front. Intervals with preserved carbonated nannofossils within some of the interglacial facies are interpreted as forming under warmer paleoclimatic conditions when less corrosive warmer northern component water (e.g., North Atlantic sourced deep water) had a greater influence on the site. Spectral analysis on the late Oligocene sediment interval shows that the glacial–interglacial cyclicity and related displacements of the Southern Ocean frontal systems between 26 and 25 Ma were forced mainly by obliquity. The paucity of iceberg-rafted debris (IRD) throughout the studied interval contrasts with earlier Oligocene and post-Miocene Climate Optimum sections from Site U1356 and with late Oligocene strata from the Ross Sea, which contain IRD and evidence for coastal glaciers and sea ice. These observations, supported by elevated sea surface paleotemperatures, the absence of sea ice, and reconstructions of fossil pollen between 26 and 25 Ma at Site U1356, suggest that open-ocean water conditions prevailed. Combined, this evidence suggests that glaciers or ice caps likely occupied the topographic highs and lowlands of the now marine Wilkes Subglacial Basin (WSB). Unlike today, the continental shelf was not overdeepened and thus ice sheets in the WSB were likely land-based, and marine-based ice sheet expansion was likely limited to coastal regions.

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“…The reasons for such a high atmospheric temperature during a time with modest greenhouse-gas forcing are still unknown. Results from Core AND-1B suggest repeated WAIS collapses during warm early middle Pliocene and Pleistocene interglacials, for example during marine isotope Stage 31 Pollard and DeConto, 2009;McKay et al, 2012;Villa et al, 2012). The hypothesis of WAIS collapses needs confirmation with a less ambiguous record from an outlet drainage basin exclusively affected by the WAIS.…”

Section: Scientific Objectivesmentioning

confidence: 97%

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Gohl¹,

Wellner²,

Klaus³

2017

International Ocean Discovery Program Scientific Prospectus

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The West Antarctic Ice Sheet (WAIS) is largely marine based and thus highly sensitive to both climatic and oceanographic changes. Therefore, the WAIS has likely had a very dynamic history over the last several million years. A complete collapse of the WAIS would result in a global sea level rise of 3.3-4.3 m, yet the world's scientific community is not able to predict its future behavior. Moreover, knowledge about past behavior of the WAIS is poor, in particular during geological times with climatic conditions similar to those expected for the near and distant future. Reconstructions and quantifications of partial or complete WAIS collapses in the past are urgently needed for constraining and testing ice sheet models that aim to predict future WAIS behavior and the potential contribution of the WAIS to global sea level rise. Large uncertainties exist regarding the chronology, extent, rates, and spatial and temporal variability of past advances and retreats of the WAIS across the continental shelves. These uncertainties largely result from the fundamental lack of data from drill cores recovered proximal to the WAIS. The continental shelf and rise of the Amundsen Sea are prime targets for drilling because the records are expected to yield archives of pure WAIS dynamics unaffected by other ice sheets and the WAIS sector draining into the Amundsen Sea Embayment (ASE) currently experiences the largest ice loss in Antarctica (Paolo et al., 2015).We propose a series of drill sites for the ASE shelf where seismic data reveal seaward-dipping sedimentary sequences that span from the preglacial depositional phase to the most recent glacial periods. Our strategy is to drill a transect from the oldest sequences close to the bedrock/basin boundary at the middle-inner shelf transition to the youngest sequences on the outer shelf in the eastern ASE. If the eastern ASE is inaccessible due to sea ice cover, a similar transect of sites can be drilled on the western ASE. The core transect will provide a detailed history of the glacial cycles in the Amundsen Sea region and allow comparison to the glacial history from the Ross Sea sector. In addition, deep-water sites on the continental rise of the Amundsen Sea are selected for recovering continuous records of glacially transported sediments and detailed archives of climatic and oceanographic changes throughout glacial-interglacial cycles. We will apply a broad suite of analytical techniques, including multiproxy analyses, to address our objectives of reconstructing the onset of glaciation in the greenhouse to icehouse transition, processes of dynamic ice sheet behavior during the Neogene and Quaternary, and ocean conditions associated with the glacial cycles.The five principal objectives of Expedition 379 are as follows:1. To reconstruct the glacial history of West Antarctica from the Paleogene to recent times and the dynamic behavior of the WAIS during the Neogene and Quaternary, especially possible partial or full WAIS collapses, and the WAIS contribution to past sea level...

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Calcareous nannofossil evidence for Marine Isotope Stage 31 (1Ma) in Core AND-1B, ANDRILL McMurdo Ice Shelf Project (Antarctica)

Cited by 21 publications

References 46 publications

A high-resolution mid-Pleistocene temperature record from Arctic Lake El'gygytgyn: a 50 kyr super interglacial from MIS 33 to MIS 31?

A high-resolution mid-Pleistocene temperature record from Arctic Lake El'gygytgyn: a 50 kyr super interglacial from MIS 33 to MIS 31?

Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 1: Insights from late Oligocene astronomically paced contourite sedimentation

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