globalchange  > 气候变化与战略
DOI: 10.5194/tc-15-1881-2021
论文题名:
Brief communication: New radar constraints support presence of ice older than 1.5 Myr at Little Dome C
作者: Lilien D.A.; Steinhage D.; Taylor D.; Parrenin F.; Ritz C.; Mulvaney R.; Martín C.; Yan J.-B.; O'Neill C.; Frezzotti M.; Miller H.; Gogineni P.; Dahl-Jensen D.; Eisen O.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期:4
起始页码: 1881
结束页码: 1888
语种: 英语
英文关键词: detection method ; ice core ; ice cover ; radar ; Antarctica ; Dome Concordia ; East Antarctica
英文摘要: The area near Dome C, East Antarctica, is thought to be one of the most promising targets for recovering a continuous ice-core record spanning more than a million years. The European Beyond EPICA consortium has selected Little Dome C (LDC), an area ∼35 km southeast of Concordia Station, to attempt to recover such a record. Here, we present the results of the final ice-penetrating radar survey used to refine the exact drill site. These data were acquired during the 2019-2020 austral summer using a new, multi-channel highresolution very high frequency (VHF) radar operating in the frequency range of 170-230 MHz. This new instrument is able to detect reflectors in the near-basal region, where previous surveys were largely unable to detect horizons. The radar stratigraphy is used to transfer the timescale of the EPICA Dome C ice core (EDC) to the area of Little Dome C, using radar isochrones dating back past 600 ka. We use these data to derive the expected depth-age relationship through the ice column at the now-chosen drill site, termed BELDC (Beyond EPICA LDC). These new data indicate that the ice at BELDC is considerably older than that at EDC at the same depth and that there is about 375m of ice older than 600 kyr at BELDC. Stratigraphy is well preserved to 2565 m, ∼93% of the ice thickness, below which there is a basal unit with unknown properties. An ice-flow model tuned to the isochrones suggests ages likely reach 1.5 Myr near 2500 m, ∼65m above the basal unit and ∼265m above the bed, with sufficient resolution (19±2 kyrm-1) to resolve 41 kyr glacial cycles. © Author(s) 2021.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164741
Appears in Collections:气候变化与战略

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作者单位: Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung, Bremerhaven, Germany; Remote Sensing Center, University of Alabama, Tuscaloosa, AL, United States; Institut des Géosciences de l'Environnement, University Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; Department of Science, University Roma Tre, Rome, Italy; Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB, Canada; Department of Geosciences, University of Bremen, Bremen, Germany

Recommended Citation:
Lilien D.A.,Steinhage D.,Taylor D.,et al. Brief communication: New radar constraints support presence of ice older than 1.5 Myr at Little Dome C[J]. Cryosphere,2021-01-01,15(4)
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