Oceanographic and climatic influences on Trooz Glacier, Antarctica during the Holocene

Minzoni, Rebecca Totten; Fonseca, Adlai Nathanael Reuel; Wellner, Julia S.; Munoz, Yuribia P.; Anderson, John B.; Tobin, Thomas S.; Lehrmann, Asmara

doi:10.1016/j.quascirev.2021.107279

Cited by 7 publications

(4 citation statements)

References 105 publications

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“…From the Deglacial towards the Middle Holocene, the Antarctic Peninsula Ice Sheet (APIS) retreated rapidly from the outer shelf to its modern configuration with high melt water discharge (Bentley et al, 2014). Several marine and lacustrine Holocene climate records reveal that the timing of both hydrological and environmental changes was highly variable across the AP (Allen et al, 2010;Ingólfsson et al, 2003;Minzoni et al, 2015;Roseby et al, 2022;Sjunneskog and Taylor, 2002;Totten et al, 2022). An overall consensus, however, is that WAP ocean temperatures were, in comparison to the Deglacial or the Late Holocene, warmer during the Early and Middle Holocene, i.e.…”

Section: Introductionmentioning

confidence: 99%

Deglacial and Holocene sea-ice and climate dynamics in the Bransfield Strait, northern Antarctic Peninsula

Vorrath¹,

Müller²,

Cárdenas³

et al. 2023

Clim. Past

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Abstract. The reconstruction of past sea-ice distribution in the Southern Ocean is crucial for an improved understanding of ice–ocean–atmosphere feedbacks and the evaluation of Earth system and Antarctic ice sheet models. The Antarctic Peninsula (AP) has been experiencing a warming since the start of regular monitoring of the atmospheric temperature in the 1950s. The associated decrease in sea-ice cover contrasts the trend of growing sea-ice extent in East Antarctica. To reveal the long-term sea-ice history at the northern Antarctic Peninsula (NAP) under changing climate conditions, we examined a marine sediment core from the eastern basin of the Bransfield Strait covering the last Deglacial and the Holocene. For sea-ice reconstructions, we focused on the specific sea-ice biomarker lipid IPSO25, a highly branched isoprenoid (HBI), and sea-ice diatoms, whereas a phytoplankton-derived HBI triene (C25:3) and warmer open-ocean diatom assemblages reflect predominantly ice-free conditions. We further reconstruct ocean temperatures using glycerol dialkyl glycerol tetraethers (GDGTs) and diatom assemblages and compare our sea-ice and temperature records with published marine sediment and ice core data. A maximum ice cover is observed during the Antarctic Cold Reversal 13 800–13 000 years before present (13.8–13 ka), while seasonally ice-free conditions permitting (summer) phytoplankton productivity are reconstructed for the late Deglacial and the Early Holocene from 13 to 8.3 ka. An overall decreasing sea-ice trend throughout the Middle Holocene coincides with summer ocean warming and increasing phytoplankton productivity. The Late Holocene is characterized by highly variable winter sea-ice concentrations and a sustained decline in the duration and/or concentration of spring sea ice. Overall diverging trends in GDGT-based TEX86L and RI-OH' subsurface ocean temperatures (SOTs) are found to be linked to opposing spring and summer insolation trends, respectively.

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Section: Introductionmentioning

confidence: 99%

Deglacial and Holocene sea-ice and climate dynamics in the Bransfield Strait, northern Antarctic Peninsula

Vorrath¹,

Müller²,

Cárdenas³

et al. 2023

Clim. Past

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“…From the Deglacial towards the Middle Holocene, the Antarctic Peninsula Ice Sheet retreated rapidly from the outer shelf to its modern configuration with heavy melt water discharge (Bentley et al, 2014). Several syntheses of Holocene climate reflected in marine and lake sediment cores reveal that the timing of both hydrological and environmental changes is highly variable at the WAP (Allen et al, 2010;Ingólfsson et al, 2003;Minzoni et al, 2015;Roseby et al, 2022;Sjunneskog and Taylor, 2002;Totten et al, 2022). The ice-core records from James Ross Island (JRI) at the northeastern tip of the AP shows a pronounced warming between about 12 and 11 ka BP followed by a cooling trend until about 9 ka BP and stable temperatures until 2.5 ka BP.…”

Section: Introductionmentioning

confidence: 99%

Deglacial and Holocene sea ice and climate dynamics at the Western Antarctic Peninsula

Vorrath

Müller

Cárdenas

et al. 2022

Preprint

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Abstract. The reconstruction of past sea ice distribution in the Southern Ocean is crucial for an improved understanding of ice-ocean-atmosphere feedbacks and the evaluation of Earth system and Antarctic ice sheet models. The Western Antarctic Peninsula (WAP) is experiencing rapid warming and the associated decrease in sea ice cover contrasts the trend of growing sea ice extent in eastern Antarctica. To reveal the long-term sea ice history at the WAP under changing climate conditions we examined a marine sediment core from the eastern basin of the Bransfield Strait covering the last Deglacial and the Holocene. For sea ice reconstructions, we focused on the specific sea ice biomarker lipid IPSO25, a highly branched isoprenoid (HBI), and sea ice diatoms, whereas a phytoplankton-derived HBI triene (C25:3) and open ocean diatom assemblages reflect predominantly ice-free conditions. We further reconstruct ocean temperatures using glycerol dialkyl glycerol tetraether (GDGTs) and diatom assemblages, and compare our sea ice and temperature records with published marine sediment and ice core data. Our results document a retreat of the WAP ice shelf at 13.9 ka BP (before present). Maximum sea ice cover is observed during the Antarctic Cold Reversal, while a still extended but variable sea ice coverage characterized the core site during the early Holocene. An overall decreasing sea ice trend throughout the Middle Holocene is accompanied by a successive ocean warming and increasing phytoplankton productivity. The Late Holocene is characterized by unstable (winter) sea ice conditions and a further sea ice decline until 0.5 ka BP.

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“…In recent decades, the increased upwelling of relatively warm Circumpolar Deep Water (CDW) and/or Modified Circumpolar Deep Water (MCDW) in the South Pacific sector of the Southern Ocean has accelerated the basal melt rate in this sector of the WAIS (Rignot et al., 2013; S. S. Jacobs et al., 1996, 2011; Thoma et al., 2008), especially in the Amundsen and Bellingshausen Seas (Nakayama et al., 2018; Pritchard et al., 2012; Rignot & Jacobs, 2002; S. S. Jacobs et al., 2011; Thoma et al., 2008). Moreover, this ocean‐forced destabilization of the WAIS is not only occurring in the present (Rignot et al., 2019; Shepherd, Fricker, et al., 2018; Shepherd, Ivins, et al., 2018; S. S. Jacobs et al., 2011; Wahlin et al., 2021), but has been shown to have occurred during the Holocene (Hillenbrand et al., 2017; Jones et al., 2021; Peck et al., 2015; Totten et al., 2022), the last deglaciation (Lowe & Anderson, 2002; Weber et al., 2014), and in previous interglacials (Turney et al., 2020). However, there are fewer constraints on how this ocean‐forced ice‐sheet instability mechanism has operated over orbital time scales before the Late Pleistocene (Levy et al., 2019; Pollard & DeConto, 2009; Teitler et al., 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this ocean-forced destabilization of the WAIS is not only occurring in the present (Rignot et al, 2019;Shepherd, Fricker, et al, 2018;Shepherd, Ivins, et al, 2018;S. S. Jacobs et al, 2011;Wahlin et al, 2021), but has been shown to have occurred during the Holocene (Hillenbrand et al, 2017;Jones et al, 2021;Peck et al, 2015;Totten et al, 2022), the last deglaciation (Lowe & Anderson, 2002;Weber et al, 2014), and in previous interglacials (Turney et al, 2020). However, there are fewer constraints on how this ocean-forced ice-sheet instability mechanism has operated over orbital time scales before the Late Pleistocene (Levy et al, 2019;Pollard & DeConto, 2009;Teitler et al, 2010).…”

mentioning

confidence: 99%

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

Wang

Tang

Wilson

et al. 2022

Geochem Geophys Geosyst

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Evidence on West Antarctic Ice Sheet (WAIS) instability through Pleistocene glacial/interglacial cycles can provide fundamental constraints on interactions between the climate system and cryosphere. To explore such ice sheet‐ocean‐climate processes on orbital timescales over the last ∼770 ka, we provide continuous records of iceberg‐rafted debris (IRD) content and clay mineralogy, supported by detrital Sr‐Nd isotopes from the pronounced IRD peaks, in gravity core ANT34/A2‐10 from the Amundsen abyssal plain. The IRD record reveals interglacial WAIS instability since ∼770 ka, while comparison to the clay mineralogy record and published records of regional oceanic and atmospheric forcing suggests a temporal link with a strengthened Antarctic Circumpolar Current, enhanced deepwater ventilation, and poleward‐shifted southern westerly winds. In addition, the Sr‐Nd isotope signature of the detrital sediments indicates a shift in provenance around Marine Isotope Stage (MIS) 16, potentially linked to regional oceanic circulation changes. We suggest that an expanded Ross Gyre was important for controlling iceberg trajectories and sediment transport to the site before MIS 16, whereas modern‐like iceberg trajectories were established after MIS 16, probably related to a poleward shift of the Amundsen Sea Low after the end of the Mid‐Pleistocene Transition. This reorganization of the ocean and atmospheric circulation was followed by an interval of enhanced WAIS variability during MIS 15 to 13, which was linked to strong orbital and ocean forcing. These insights into the role of ocean‐atmosphere forcing on the past behavior of the WAIS may improve our framework for understanding future changes in this region.

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Oceanographic and climatic influences on Trooz Glacier, Antarctica during the Holocene

Cited by 7 publications

References 105 publications

Deglacial and Holocene sea-ice and climate dynamics in the Bransfield Strait, northern Antarctic Peninsula

Deglacial and Holocene sea-ice and climate dynamics in the Bransfield Strait, northern Antarctic Peninsula

Deglacial and Holocene sea ice and climate dynamics at the Western Antarctic Peninsula

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

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