Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C
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 similar to 35 km southeast of Concordia Station, to...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://curis.ku.dk/portal/da/publications/brief-communication(eeacb299-2569-4394-8098-c8eae64dcb65).html https://doi.org/10.5194/tc-15-1881-2021 https://curis.ku.dk/ws/files/262794836/tc_15_1881_2021.pdf |
id |
ftcopenhagenunip:oai:pure.atira.dk:publications/eeacb299-2569-4394-8098-c8eae64dcb65 |
---|---|
record_format |
openpolar |
spelling |
ftcopenhagenunip:oai:pure.atira.dk:publications/eeacb299-2569-4394-8098-c8eae64dcb65 2024-06-09T07:40:30+00:00 Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C Lilien, David A. Steinhage, Daniel Taylor, Drew Parrenin, Frederic Ritz, Catherine Mulvaney, Robert Martin, Carlos Yan, Jie-Bang O'Neill, Charles Frezzotti, Massimo Miller, Heinrich Gogineni, Prasad Dahl-Jensen, Dorthe Eisen, Olaf 2021-04-19 application/pdf https://curis.ku.dk/portal/da/publications/brief-communication(eeacb299-2569-4394-8098-c8eae64dcb65).html https://doi.org/10.5194/tc-15-1881-2021 https://curis.ku.dk/ws/files/262794836/tc_15_1881_2021.pdf eng eng info:eu-repo/semantics/openAccess Lilien , D A , Steinhage , D , Taylor , D , Parrenin , F , Ritz , C , Mulvaney , R , Martin , C , Yan , J-B , O'Neill , C , Frezzotti , M , Miller , H , Gogineni , P , Dahl-Jensen , D & Eisen , O 2021 , ' Brief communication : New radar constraints support presence of ice older than 1.5 Myr at Little Dome C ' , Cryosphere , vol. 15 , no. 4 , pp. 1881-1888 . https://doi.org/10.5194/tc-15-1881-2021 CHRONOLOGY article 2021 ftcopenhagenunip https://doi.org/10.5194/tc-15-1881-2021 2024-05-16T11:29:20Z 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 similar to 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 high-resolution 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, similar to 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, similar to 65m above the basal unit and similar to 265m above the bed, with sufficient resolution (19 +/- 2 kyrm(-1)) to resolve 41 kyr glacial cycles. Article in Journal/Newspaper Antarc* Antarctica East Antarctica EPICA ice core University of Copenhagen: Research Austral Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) East Antarctica The Cryosphere 15 4 1881 1888 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
CHRONOLOGY |
spellingShingle |
CHRONOLOGY Lilien, David A. Steinhage, Daniel Taylor, Drew Parrenin, Frederic Ritz, Catherine Mulvaney, Robert Martin, Carlos Yan, Jie-Bang O'Neill, Charles Frezzotti, Massimo Miller, Heinrich Gogineni, Prasad Dahl-Jensen, Dorthe Eisen, Olaf Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
topic_facet |
CHRONOLOGY |
description |
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 similar to 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 high-resolution 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, similar to 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, similar to 65m above the basal unit and similar to 265m above the bed, with sufficient resolution (19 +/- 2 kyrm(-1)) to resolve 41 kyr glacial cycles. |
format |
Article in Journal/Newspaper |
author |
Lilien, David A. Steinhage, Daniel Taylor, Drew Parrenin, Frederic Ritz, Catherine Mulvaney, Robert Martin, Carlos Yan, Jie-Bang O'Neill, Charles Frezzotti, Massimo Miller, Heinrich Gogineni, Prasad Dahl-Jensen, Dorthe Eisen, Olaf |
author_facet |
Lilien, David A. Steinhage, Daniel Taylor, Drew Parrenin, Frederic Ritz, Catherine Mulvaney, Robert Martin, Carlos Yan, Jie-Bang O'Neill, Charles Frezzotti, Massimo Miller, Heinrich Gogineni, Prasad Dahl-Jensen, Dorthe Eisen, Olaf |
author_sort |
Lilien, David A. |
title |
Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
title_short |
Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
title_full |
Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
title_fullStr |
Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
title_full_unstemmed |
Brief communication:New radar constraints support presence of ice older than 1.5 Myr at Little Dome C |
title_sort |
brief communication:new radar constraints support presence of ice older than 1.5 myr at little dome c |
publishDate |
2021 |
url |
https://curis.ku.dk/portal/da/publications/brief-communication(eeacb299-2569-4394-8098-c8eae64dcb65).html https://doi.org/10.5194/tc-15-1881-2021 https://curis.ku.dk/ws/files/262794836/tc_15_1881_2021.pdf |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Austral Concordia Station East Antarctica |
geographic_facet |
Austral Concordia Station East Antarctica |
genre |
Antarc* Antarctica East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctica East Antarctica EPICA ice core |
op_source |
Lilien , D A , Steinhage , D , Taylor , D , Parrenin , F , Ritz , C , Mulvaney , R , Martin , C , Yan , J-B , O'Neill , C , Frezzotti , M , Miller , H , Gogineni , P , Dahl-Jensen , D & Eisen , O 2021 , ' Brief communication : New radar constraints support presence of ice older than 1.5 Myr at Little Dome C ' , Cryosphere , vol. 15 , no. 4 , pp. 1881-1888 . https://doi.org/10.5194/tc-15-1881-2021 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-1881-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1881 |
op_container_end_page |
1888 |
_version_ |
1801383886332100608 |