Did Holocene climate changes drive West Antarctic grounding line retreat and readvance?
Knowledge of past ice sheet configurations is useful for informing projections of future ice sheet dynamics and for calibrating ice sheet models. The topology of grounding line retreat in the Ross Sea sector of Antarctica has been much debated, but it has generally been assumed that the modern ice s...
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Copernicus Publications
2021
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Online Access: | https://doi.org/10.5194/tc-15-4655-2021 https://doaj.org/article/40f0e2baba564659bd64d8f1999e3019 |
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ftdoajarticles:oai:doaj.org/article:40f0e2baba564659bd64d8f1999e3019 2023-05-15T13:53:16+02:00 Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? S. U. Neuhaus S. M. Tulaczyk N. D. Stansell J. J. Coenen R. P. Scherer J. A. Mikucki R. D. Powell 2021-10-01T00:00:00Z https://doi.org/10.5194/tc-15-4655-2021 https://doaj.org/article/40f0e2baba564659bd64d8f1999e3019 EN eng Copernicus Publications https://tc.copernicus.org/articles/15/4655/2021/tc-15-4655-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-4655-2021 1994-0416 1994-0424 https://doaj.org/article/40f0e2baba564659bd64d8f1999e3019 The Cryosphere, Vol 15, Pp 4655-4673 (2021) Environmental sciences GE1-350 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/tc-15-4655-2021 2022-12-31T07:40:28Z Knowledge of past ice sheet configurations is useful for informing projections of future ice sheet dynamics and for calibrating ice sheet models. The topology of grounding line retreat in the Ross Sea sector of Antarctica has been much debated, but it has generally been assumed that the modern ice sheet is as small as it has been for more than 100 000 years (Conway et al., 1999; Lee et al., 2017; Lowry et al., 2019; McKay et al., 2016; Scherer et al., 1998). Recent findings suggest that the West Antarctic Ice Sheet (WAIS) grounding line retreated beyond its current location earlier in the Holocene and subsequently readvanced to reach its modern position (Bradley et al., 2015; Kingslake et al., 2018). Here, we further constrain the post-LGM (Last Glacial Maximum) grounding line retreat and readvance in the Ross Sea sector using a two-phase model of radiocarbon input and decay in subglacial sediments from six sub-ice sampling locations. In addition, we reinterpret high basal temperature gradients, measured previously at three sites in this region (Engelhardt, 2004), which we explain as resulting from recent ice shelf re-grounding accompanying grounding line readvance. At one location – Whillans Subglacial Lake (SLW) – for which a sediment porewater chemistry profile is known, we estimate the grounding line readvance by simulating ionic diffusion. Collectively, our analyses indicate that the grounding line retreated over SLW <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mn mathvariant="normal">4300</mn><mrow><mo>-</mo><mn mathvariant="normal">2500</mn></mrow><mrow><mo>+</mo><mn mathvariant="normal">1500</mn></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="50pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="a00bd3b1235980ba5027f9213935f3e1"><svg:image ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic Ross Sea West Antarctic Ice Sheet Lowry ENVELOPE(-64.150,-64.150,-84.550,-84.550) Conway ENVELOPE(-61.422,-61.422,-62.841,-62.841) Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) The Cryosphere 15 10 4655 4673 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 S. U. Neuhaus S. M. Tulaczyk N. D. Stansell J. J. Coenen R. P. Scherer J. A. Mikucki R. D. Powell Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Knowledge of past ice sheet configurations is useful for informing projections of future ice sheet dynamics and for calibrating ice sheet models. The topology of grounding line retreat in the Ross Sea sector of Antarctica has been much debated, but it has generally been assumed that the modern ice sheet is as small as it has been for more than 100 000 years (Conway et al., 1999; Lee et al., 2017; Lowry et al., 2019; McKay et al., 2016; Scherer et al., 1998). Recent findings suggest that the West Antarctic Ice Sheet (WAIS) grounding line retreated beyond its current location earlier in the Holocene and subsequently readvanced to reach its modern position (Bradley et al., 2015; Kingslake et al., 2018). Here, we further constrain the post-LGM (Last Glacial Maximum) grounding line retreat and readvance in the Ross Sea sector using a two-phase model of radiocarbon input and decay in subglacial sediments from six sub-ice sampling locations. In addition, we reinterpret high basal temperature gradients, measured previously at three sites in this region (Engelhardt, 2004), which we explain as resulting from recent ice shelf re-grounding accompanying grounding line readvance. At one location – Whillans Subglacial Lake (SLW) – for which a sediment porewater chemistry profile is known, we estimate the grounding line readvance by simulating ionic diffusion. Collectively, our analyses indicate that the grounding line retreated over SLW <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mn mathvariant="normal">4300</mn><mrow><mo>-</mo><mn mathvariant="normal">2500</mn></mrow><mrow><mo>+</mo><mn mathvariant="normal">1500</mn></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="50pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="a00bd3b1235980ba5027f9213935f3e1"><svg:image ... |
format |
Article in Journal/Newspaper |
author |
S. U. Neuhaus S. M. Tulaczyk N. D. Stansell J. J. Coenen R. P. Scherer J. A. Mikucki R. D. Powell |
author_facet |
S. U. Neuhaus S. M. Tulaczyk N. D. Stansell J. J. Coenen R. P. Scherer J. A. Mikucki R. D. Powell |
author_sort |
S. U. Neuhaus |
title |
Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
title_short |
Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
title_full |
Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
title_fullStr |
Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
title_full_unstemmed |
Did Holocene climate changes drive West Antarctic grounding line retreat and readvance? |
title_sort |
did holocene climate changes drive west antarctic grounding line retreat and readvance? |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-4655-2021 https://doaj.org/article/40f0e2baba564659bd64d8f1999e3019 |
long_lat |
ENVELOPE(-64.150,-64.150,-84.550,-84.550) ENVELOPE(-61.422,-61.422,-62.841,-62.841) ENVELOPE(-64.250,-64.250,-84.450,-84.450) |
geographic |
Antarctic Ross Sea West Antarctic Ice Sheet Lowry Conway Whillans |
geographic_facet |
Antarctic Ross Sea West Antarctic Ice Sheet Lowry Conway Whillans |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea The Cryosphere |
op_source |
The Cryosphere, Vol 15, Pp 4655-4673 (2021) |
op_relation |
https://tc.copernicus.org/articles/15/4655/2021/tc-15-4655-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-4655-2021 1994-0416 1994-0424 https://doaj.org/article/40f0e2baba564659bd64d8f1999e3019 |
op_doi |
https://doi.org/10.5194/tc-15-4655-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
10 |
container_start_page |
4655 |
op_container_end_page |
4673 |
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