Evidence of a full West Antarctic Ice Sheet back to the early Oligocene: insight from double dating of detrital apatites in Ross Sea sediments.

Olivetti, Valerio; Balestrieri, Maria Laura; Rossetti, Federico; Thomson, S. N.; Talarico, F.; Zattin, Massımılıano

doi:10.1111/ter.12153

Cited by 14 publications

(14 citation statements)

References 56 publications

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“…Higher-resolution modelling and better representation of climate feedbacks offer some potential improvements in this regard (Huber and Caballero, 2011;Baatsen et al, 2018), and the current Deep-MIP modelling effort might provide further insights into the causes of this common model bias. It should also be noted that these simulations were run with relatively arbitrary pCO 2 levels (although they are of a plausible magnitude; Pearson et al, 2009;Pagani et al, 2011;Foster et al, 2017), and these could be refined to provide a slightly better absolute fit to the data. Orbital variability does not appear to have a major impact on the comparison, as shown by the relatively minor impact on the results in the FOAM simulations and due to the length of the averaged periods of the proxy records.…”

Section: Discrepancies and Uncertainty In The Latitudinal Temperaturementioning

confidence: 99%

Changes in the high-latitude Southern Hemisphere through the Eocene–Oligocene transition: a model–data comparison

et al. 2020

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The global and regional climate changed dramatically with the expansion of the Antarctic Ice Sheet at the Eocene-Oligocene transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO 2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this time. To better understand the Southern Hemisphere regional climatic changes and the impact of glaciation on the Earth's oceans and atmosphere at the EOT, we compiled a database of 10 ocean and 4 landsurface temperature reconstructions from a range of proxy records and compared this with a series of fully coupled, low-resolution climate model simulations from two models (HadCM3BL and FOAM). Regional patterns in the proxy records of temperature show that cooling across the EOT was less at high latitudes and greater at mid-latitudes. While certain climate model simulations show moderate-good performance at recreating the temperature patterns shown in the data before and after the EOT, in general the model simulations do not capture the absolute latitudinal temperature gradient shown by the data, being too cold, particularly at high latitudes. When taking into account the absolute temperature before and after the EOT, as well as the change in temperature across it, simulations with a closed Drake Passage before and after the EOT or with an opening of the Drake Passage across the EOT perform poorly, whereas simulations with a drop in atmospheric pCO 2 in combination with ice growth generally perform better. This provides further sup-port for previous research that changes in atmospheric pCO 2 are more likely to have been the driver of the EOT climatic changes, as opposed to the opening of the Drake Passage.www.clim-past.net/16/555/2020/

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Section: Discrepancies and Uncertainty In The Latitudinal Temperaturementioning

confidence: 99%

Changes in the high-latitude Southern Hemisphere through the Eocene–Oligocene transition: a model–data comparison

et al. 2020

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“…Various sites around the Ross Sea showed the maximum AIS expansion occurring around ~32 Ma (e.g. Olivetti et al, 2015;Galeotti et al, 2016), significantly after the EOT, while sedimentological evidence from the Weddell Sea suggests that region of West Antarctica was not fully glaciated until much more recently (~15 Ma; Huang et al, 2014). If this climatic fingerprint of a smaller AIS is robust, given that this signal already appears to be present in the data even with only limited site locations, there could be potential in future work to be able to constrain the extent of the AIS using only a climate model and proxy temperature records, which could then be used to independently verify other estimates from ice sheet modelling or proxy estimates using δ 18 O.…”

Section: Evaluation Across Time Slicesmentioning

confidence: 99%

Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition: a model-data comparison

Kennedy-Asser¹,

Lunt²,

Valdes³

et al. 2019

Preprint

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Abstract. Global and regional climate changed dramatically with the expansion of the Antarctic Ice sheet at the Eocene-Oligocene Transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this time. To better understand the Southern Hemisphere regional climatic changes and the impact of glaciation on the Earth’s oceans and atmosphere at the EOT, we compiled a database of sea and land surface temperature reconstructions from a range of proxy records and compared this with a series of fully-coupled climate model simulations. Regional patterns in the proxy records of temperature show that cooling across the EOT was less at high latitudes and greater at mid-latitudes. Climate model simulations have some issues in capturing the zonal mean latitudinal temperature profiles shown by the proxy data, but certain simulations do show moderate-good performance at recreating the temperature patterns shown in the data. When taking into account the absolute temperature before and after the EOT, as well as the change in temperature across it, simulations with a closed Drake Passage before and after the EOT or with an opening of the Drake Passage across the EOT perform poorly, whereas simulations with a drop in atmospheric pCO2 in combination with ice growth generally perform better. This provides further support to previous research that changes in atmospheric pCO2 are more likely to have been the driver of the EOT climatic changes, as opposed to opening of the Drake Passage.

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“…The Ross Sea is a crucial area to investigate the history of Antarctic ice during the Cenozoic as it records the evolution of both the East and West Antarctic Ice Sheets, whose variations are a direct response to climate change. In recent years, samples from offshore drilling projects have been investigated with different geochronological and thermochronological techniques (Barrett, Nicholls, Murray, Smith, & Vaughan, ; Hambrey, Barrett, & Powell, ; Olivetti et al., ; Talalay & Pyneb, ; Zattin, Andreucci, Thomson, Reiners, & Talarico, ). These drillholes, mostly located in McMurdo Sound, provide information on the ice flows in the area of the western Ross Sea.…”

Section: Introductionmentioning

confidence: 99%

“…These drillholes, mostly located in McMurdo Sound, provide information on the ice flows in the area of the western Ross Sea. The stratigraphy of the cores drilled during the Cape Roberts Project cover a nearly continuous marine sedimentary record from early Oligocene to early Miocene, and suggest the presence of a West Antarctic Ice Sheet in the western Ross Sea since the Oligocene (Olivetti, Balestrieri, Rossetti, & Talarico, ; Olivetti et al., ). The two drillholes of the Antarctic Geological Drill project (ANDRILL) investigated the last ca.…”

Section: Introductionmentioning

confidence: 99%

A detrital apatite fission‐track study of the CIROS‐2 sedimentary record: Tracing ice pathways in the Ross Sea area over the last 5 Ma

Zattin

Olivetti

2019

Terra Nova

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The Ross Sea is a crucial area to investigate pathways of ice during the Cenozoic as it records the evolution of both the East and West Antarctic Ice Sheets. This work is based on detrital apatite fission track (AFT) data extracted from the sedimentary record of well CIROS‐2, which spans the last 5 Ma. The AFT data show a large range of ages, and most of the grains fit well with two main components that fall between 24 and 42 Ma and between 43 and 70 Ma, whereas the other components are not regularly distributed through the well, thus indicating a mixture of provenance from different areas along the Transantarctic Mountains. As a whole, our work suggests glacial expansion over the McMurdo Sound during the Pliocene, and ice periodically invading and retreating in Pleistocene.

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Evidence of a full West Antarctic Ice Sheet back to the early Oligocene: insight from double dating of detrital apatites in Ross Sea sediments.

Cited by 14 publications

References 56 publications

Changes in the high-latitude Southern Hemisphere through the Eocene–Oligocene transition: a model–data comparison

Changes in the high-latitude Southern Hemisphere through the Eocene–Oligocene transition: a model–data comparison

Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition: a model-data comparison

A detrital apatite fission‐track study of the CIROS‐2 sedimentary record: Tracing ice pathways in the Ross Sea area over the last 5 Ma

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