A detailed radiostratigraphic data set for the central East Antarctic
Plateau spanning the last half million years

Cavitte, Marie G. P.; Young, D. A.; Mulvaney, Robert; Ritz, Catherine; Greenbaum, J. S.; Ng, Gregory; Kempf, S. D.; Quartini, Enrica; Muldoon, Gail R.; Paden, John; Frezzotti, Màssimo; Roberts, Jason L.; Tozer, Carly R.; Schroeder, Dustin M.; Blankenship, D. D.

doi:10.5194/essd-2020-393

Cited by 6 publications

(8 citation statements)

References 57 publications

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“…et al, 2016). Data were collected with the High Capability Airborne Radar Sounder (HiCARS) 1 and 2, operating over frequency range 52.5-67.5 MHz (Cavitte et al, 2021), and were processed and published in Young et al (2017); Cavitte et al (2020Cavitte et al ( , 2021. These data cover an area around 100×100 km 2 over LDC and intersect the EDC site for dating.…”

Section: Datasetsmentioning

confidence: 99%

“…The depth uncertainty arises from several contributions. The DELORES radar system operating over frequency range 0.6-7 MHz has a vertical resolution of 11.1 m and range precision of 3 m (Cavitte et al, 2021). The two-way travel time to depth conversion results in a firn correction uncertainty of ±3 m (Lilien et al, 2021) and ±0.44% uncertainty for the wave speed in ice.…”

Section: Datasetsmentioning

confidence: 99%

“…In this study, the same method was used to trace four further discontinuous IRHs in the DELORES radar data however, the uncertainty was too high for them to be considered here. Cavitte et al (2021) traced seven deep IRHs in the HiCARS dataset which could not be linked to EDC. They used a different numerical model to date the IRHs and found that at LDC, their oldest IRH was ∼700 ka.…”

Section: Radar Dataset Limitationsmentioning

confidence: 99%

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Stagnant ice and age modelling in the Dome C region, Antarctica

Chung

Parrenin

Steinhage

et al. 2023

Preprint

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Abstract. We present a 1D numerical model which calculates the age of ice around Dome C. It accounts either for melting or for a layer of stagnant ice above the bedrock, depending on the value of an inverted mechanical ice thickness. It is constrained by horizons picked from radar observations and dated using the EPICA Dome C (EDC) ice core age profile. We used 3 different radar datasets with the widest reaching airbourne radar system covering an area of 10,000 km2 and zooming in to 5 km transects over Little Dome C (LDC) with a ground based system. We find that stagnant ice exists in many places including above the LDC relief where the new Beyond EPICA drill site (BELDC) is located. The modelled thickness of this layer of stagnant ice roughly corresponds to the thickness of the basal unit observed in one of the radar surveys and observations made with Autonomous phase-sensitive Radio-Echo Sounder (ApRES). At BELDC, the modelled stagnant ice thickness is 182 ± 63 m and the modelled maximum age (that we define as the age at a maximum age density of 20 kyr m−1) is 1.49 ± 0.18 Ma at a depth of 2505 ± 34 m. This is very similar to all sites situated on the LDC relief such as that of the Million Year Ice Core project being conducted by the Australian Antarctic Division (AAD). The model was also applied to radar data in the area 10–20 km north of EDC (North Patch, NP), where we find either a thin layer of stagnant ice (generally < 60 m) or a very low melt rate (< 0.1 mm yr−1). The modelled maximum age at NP is over 2 Ma in most places, with ice at 1.5 Ma having a resolution of 9–12 kyr m−1 , making it an exciting prospect for a future oldest ice drill site.

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Section: Datasetsmentioning

confidence: 99%

Section: Datasetsmentioning

confidence: 99%

Section: Radar Dataset Limitationsmentioning

confidence: 99%

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Stagnant ice and age modelling in the Dome C region, Antarctica

Chung

Parrenin

Steinhage

et al. 2023

Preprint

View full text Add to dashboard Cite

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“…The Oldest Ice candidate A (OIA) survey was conducted in January 2016 by the University of Texas at Austin Institute for Geophysics (UTIG), the Australian Antarctic Division (AAD) and the French Polar Institute Paul-Émile Victor (IPEV) as part of the ICECAP project (International Collaborative Exploration of the Cryosphere through Airborne Profiling, Cavitte et al, 2016). Radar data were collected with the High Capability Airborne Radar Sounder (HiCARS) 1 and 2, operating over frequency range 52.5-67.5 MHz (Cavitte et al, 2021), and were processed and published in Young et al (2017) and Cavitte et al (2020Cavitte et al ( , 2021. These data cover an area around 100 × 100 km 2 over LDC and Dome C. Cavitte et al (2021) traced 26 IRHs, and 19 of those were dated by linking them to the EDC site using a different transect which passes closer to EDC than the HiCARS transect (Table 3 of Cavitte et al, 2021, provides IRH ages and uncertainties).…”

Section: Utig Hicarsmentioning

confidence: 99%

Stagnant ice and age modelling in the Dome C region, Antarctica

Chung,

Parrenin,

Steinhage

et al. 2023

The Cryosphere

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Abstract. The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m−1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. The model inverts for basal conditions and accounts either for melting or for a layer of stagnant ice above the bedrock. It is constrained by internal reflecting horizons traced in radargrams and dated using the EPICA Dome C (EDC) ice core age profile. We used three different radar datasets ranging from a 10 000 km2 airborne survey down to 5 km long ground-based radar transects over LDC. We find that stagnant ice exists in many places, including above the LDC relief where the new Beyond EPICA drill site (BELDC) is located. The modelled thickness of this layer of stagnant ice roughly corresponds to the thickness of the basal unit observed in one of the radar surveys and in the autonomous phase-sensitive radio-echo sounder (ApRES) dataset. At BELDC, the modelled stagnant ice thickness is 198±44 m and the modelled oldest age of ice is 1.45±0.16 Ma at a depth of 2494±30 m. This is very similar to all sites situated on the LDC relief, including that of the Million Year Ice Core project being conducted by the Australian Antarctic Division. The model was also applied to radar data in the area 10–15 km north of EDC (North Patch), where we find either a thin layer of stagnant ice (generally <60 m) or a negligible melt rate (<0.1 mm yr−1). The modelled maximum age at North Patch is over 2 Ma in most places, with ice at 1.5 Ma having a resolution of 9–12 kyr m−1, making it an exciting prospect for a future Oldest Ice drill site.

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“…However, Cavitte et al ( 2016) laid a lot of the ground work (and cited by Winter al ( 2017)). In addition, there is also the work of MacGregor et al (2015) that should cited here.…”

A detailed radiostratigraphic data set for the central East Antarctic Plateau spanning the last half million years

Cited by 6 publications

References 57 publications

Stagnant ice and age modelling in the Dome C region, Antarctica

Stagnant ice and age modelling in the Dome C region, Antarctica

Stagnant ice and age modelling in the Dome C region, Antarctica

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