The Ross Sea Dipole – temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica,  over the past 2700 years

Bertler, Nancy A. N.; Conway, H.; Dahl-Jensen, Dorthe; Emanuelsson, B. Daniel; Winstrup, Mai; Vallelonga, Paul; Lee, James E.; Brook, E.; Severinghaus, Jeffrey P.; Fudge, T. J.; Keller, Elizabeth D.; Baisden, W. T.; Hindmarsh, Richard C. A.; Neff, Peter D.; Blunier, Thomas; Edwards, Ross; Mayewski, Paul Andrew; Kipfstuhl, Sepp; Buizert, Christo; Canessa, Silvia; Dadić, Ruzica; Kjær, Helle Astrid; Kurbatov, Andrei V.; Zhang, Dongqi; Waddington, Edwin D.; Baccolo, Giovanni; Beers, Thomas M.; Brightley, Hannah J.; Carter, Lionel; Clemens‐Sewall, David; Ciobanu, V.; Delmonte, Barbara; Eling, Lukas; Ellis, Aja; Ganesh, Shruthi; Golledge, Nicholas R.; Haines, Skylar A.; Handley, Michael; Hawley, R. L.; Hogan, Chad M.; Johnson, Katelyn; Korotkikh, Elena; Lowry, Daniel P.; Mandeno, Darcy; McKay, Robert; Menking, J. A.; Naish, T.; Noerling, Caroline; Ollive, Agathe; Orsi, Anaïs; Proemse, Bernadette C.; Pyne, A.; Pyne, Rebecca L.; Renwick, James; Scherer, Reed P.; Semper, Stefanie; Simonsen, Marius; Sneed, Sharon B.; Steig, Eric J.; Tuohy, Andrea; Venugopal, Abhijith U.; Valero-Delgado, Fernando; Venkatesh, Janani; Wang, Feiteng; Wang, Shimeng; Winski, D.; Winton, V. Holly L.; Whiteford, Arran; Xiao, Cunde; Yang, Jin‐Hui; Zhang, Xin

doi:10.5194/cp-14-193-2018

Cited by 55 publications

(61 citation statements)

References 126 publications

(160 reference statements)

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“…Extensive radar investigations were performed at Roosevelt Island (Conway et al, 1999;Kingslake et al, 2014) and a deep ice core was collected (Bertler et al, 2018). We use a modern surface temperature of −24 °C, ice thickness of 765 m (Bertler et al, 2018), and accumulation rate of 0.22 m/a ice eq. ( Winstrup et al, 2019).…”

Section: Roosevelt Islandmentioning

confidence: 99%

Constraining Geothermal Flux at Coastal Domes of the Ross Ice Sheet, Antarctica

Fudge

Biyani

Clemens‐Sewall

et al. 2019

Geophysical Research Letters

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The geothermal flux is an important boundary condition for ice‐sheet models because it influences whether the ice is melting at the bed and able to slide. Point measurements and remotely sensed estimates vary widely for the Ross Ice Sheet. A basal temperature measurement at Roosevelt Island reveals a geothermal flux of 84 ± 13 mW/m2. The presence of Raymond Arches, which form only at ice divides that are frozen at the bed, allows inferences of the maximum geothermal flux at two coastal domes along the Siple Coast: Engelhardt Ridge, 85 ± 11 mW/m2 and Shabtaie Ridge, 75 ± 10 mW/m2. These measurements indicate heat flows similar to measurements at Siple Dome and the Whillans grounding zone and to the continental crust average. The high values measured at Subglacial Lake Whillans and estimated from satellite observations of Curie depths are not widespread.

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Section: Roosevelt Islandmentioning

confidence: 99%

Constraining Geothermal Flux at Coastal Domes of the Ross Ice Sheet, Antarctica

Fudge

Biyani

Clemens‐Sewall

et al. 2019

Geophysical Research Letters

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“…Here several key components of the Antarctic system are found in close correspondence determining complex dynamics (Bertler et al, 2018;Mezgec et al, 2017). Talos Dome (TD) is a peripheral ice dome at the edge of EAIS, near Victoria Land, in the western region of the Ross Sea area.…”

Section: Introductionmentioning

confidence: 99%

Regionalization of the Atmospheric Dust Cycle on the Periphery of the East Antarctic Ice Sheet Since the Last Glacial Maximum

Baccolo

Delmonte

Albani

et al. 2018

Geochem Geophys Geosyst

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Ice cores from inner East Antarctica provided some of the longest and most detailed climatic reconstructions and allowed understanding the relationships between atmospheric mineral dust and climate. In this work we present synchrotron radiation X‐ray Fluorescence geochemical data of dust from the TALDICE ice core drilled at Talos Dome, a peripheral ice dome of East Antarctica (Western Ross Sea). Results highlight a dominant southern South American origin for dust at TALDICE during the Last Glacial Maximum, similarly to other sites located further inland onto the polar plateau. On the contrary, a different scenario concerns Talos Dome during the Holocene if it is compared to more inner sites. The tight connection between high southern latitudes and Antarctica that characterizes cold climate stages becomes weaker since the onset of the last climatic transition and throughout the Holocene. The net effect of this process at Talos Dome is a modification of the atmospheric and environmental settings, owing to local Antarctic sources of Victoria Land to gain importance and become the dominant ones. At the same time in inner East Antarctica the provenance of dust remains remote also during Holocene, revealing an evolution of the homogeneous scenario observed in glacial periods. The enhanced sensitivity of peripheral ice sheet sites to local dust sources makes Talos Dome an ideal site to assess the climatic and atmospheric changes of the peripheral sectors of East Antarctica during the current interglacial period.

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“…In 2012, the uppermost section (8.57-40 m) of the RICE main core was processed and analyzed using the GNS Science melter system, with continuous measurements of stable water isotopes (δD, δ 18 O) and black carbon, as well as discrete sampling of major ion and trace element concentrations. The following year, this setup was replaced by an expanded version of the Copenhagen CFA system (Bigler et al, 2011), providing high-resolution continuous measurements of liquid conductivity, calcium (Ca 2+ ), insoluble dust particles, acidity (H + ), and black carbon (BC), as well as stable water isotopes (δD, δ 18 O) and methane gas concentrations (Table 1). The RICE-12/13-B firn core was analyzed using this system.…”

mentioning

confidence: 99%

“…Each minute, 5 mL of meltwater was directed to each of two fraction collectors (IC and ICP-MS aliquots) and 1.1 mL was used for continuous measurements of water isotopes (0.05 mL) and black carbon (1.05 mL) by the LGR and DMT SP2 instruments. The remaining 1.8 mL was sent to flow-through liquid conductivity and insoluble particle analyzers (Bigler et al, 2011) and then split for continuous analysis of soluble calcium (Traversi et al, 2007) and acidity . A third fraction collector was used to collect discrete samples for water isotopes from the melthead overflow lines originating from the outer core section, these being used for quality assurance of the continuous measurements.…”

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confidence: 99%

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Winstrup¹

2018

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We present a 2700-year annually resolved chronology and snow accumulation history for the Roosevelt Island Climate Evolution (RICE) ice core, Ross Ice Shelf, West Antarctica. The core adds information on past accumulation changes in an otherwise poorly constrained sector of Antarctica.The timescale was constructed by identifying annual cycles in high-resolution impurity records, and it constitutes the top part of the Roosevelt Island Ice Core Chronology 2017 (RICE17). Validation by volcanic and methane matching to the WD2014 chronology from the WAIS Divide ice core shows that the two timescales are in excellent agreement. In a companion paper, gas matching to WAIS Divide is used to extend the timescale for the deeper part of the core in which annual layers cannot be identified.Based on the annually resolved timescale, we produced a record of past snow accumulation at Roosevelt Island. The accumulation history shows that Roosevelt Island experienced slightly increasing accumulation rates be-tween 700 BCE and 1300 CE, with an average accumulation of 0.25 ± 0.02 m water equivalent (w.e.) per year. Since 1300 CE, trends in the accumulation rate have been consistently negative, with an acceleration in the rate of decline after the mid-17th century. The current accumulation rate at Roosevelt Island is 0.210 ± 0.002 m w.e. yr −1 (average since 1965 CE, ±2σ ), and it is rapidly declining with a trend corresponding to 0.8 mm yr −2 . The decline observed since the mid-1960s is 8 times faster than the long-term decreasing trend taking place over the previous centuries, with decadal mean accumulation rates consistently being below average. Previous research has shown a strong link between Roosevelt Island accumulation rates and the location and intensity of the Amundsen Sea Low, which has a significant impact on regional sea-ice extent. The decrease in accumulation rates at Roosevelt Island may therefore be explained in terms of a recent strengthening of the ASL and the expansion of sea ice in the eastern Ross Sea. The start of the rapid decrease in RICE accumulation rates observed in 1965 CE may Published by Copernicus Publications on behalf of the European Geosciences Union. 752 M. Winstrup et al.: Timescale and accumulation history for an ice core from Roosevelt Island thus mark the onset of significant increases in regional seaice extent. www.clim-past.net/15/751/2019/ Clim. Past, 15, 751-779, 2019 org/view/dataset/601070 and https://doi.org/10.15784/601070 (Kingslake Matsuoka et al., 2015). Supplement.The supplement related to this article is available online at: https://doi.org/10.5194/cp-15-751-2019-supplement.

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The Ross Sea Dipole – temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica, over the past 2700 years

Abstract: Abstract. High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of climate patterns relevant for future projections.

Cited by 55 publications

References 126 publications

Constraining Geothermal Flux at Coastal Domes of the Ross Ice Sheet, Antarctica

Constraining Geothermal Flux at Coastal Domes of the Ross Ice Sheet, Antarctica

Regionalization of the Atmospheric Dust Cycle on the Periphery of the East Antarctic Ice Sheet Since the Last Glacial Maximum

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