Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations
Constraining Antarctica's climate evolution since the end of the Last Glacial Maximum ( ∼18 ka) remains a key challenge, but is important for accurately projecting future changes in Antarctic ice sheet mass balance. Here we perform a spatial and temporal analysis of two transient deglacial clim...
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ftdoajarticles:oai:doaj.org/article:8533e2c70b884c53bf00479ee95c3cbe 2023-05-15T13:46:48+02:00 Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations D. P. Lowry N. R. Golledge L. Menviel N. A. N. Bertler 2019-01-01T00:00:00Z https://doi.org/10.5194/cp-15-189-2019 https://doaj.org/article/8533e2c70b884c53bf00479ee95c3cbe EN eng Copernicus Publications https://www.clim-past.net/15/189/2019/cp-15-189-2019.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-15-189-2019 1814-9324 1814-9332 https://doaj.org/article/8533e2c70b884c53bf00479ee95c3cbe Climate of the Past, Vol 15, Pp 189-215 (2019) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2019 ftdoajarticles https://doi.org/10.5194/cp-15-189-2019 2022-12-31T13:06:03Z Constraining Antarctica's climate evolution since the end of the Last Glacial Maximum ( ∼18 ka) remains a key challenge, but is important for accurately projecting future changes in Antarctic ice sheet mass balance. Here we perform a spatial and temporal analysis of two transient deglacial climate simulations, one using a fully coupled GCM (TraCE-21ka) and one using an intermediate complexity model (LOVECLIM DG ns ), to determine regional differences in deglacial climate evolution and identify the main strengths and limitations of the models in terms of climate variables that impact ice sheet mass balance. The greatest continental surface warming is observed over the continental margins in both models, with strong correlations between surface albedo, sea ice coverage, and surface air temperature along the coasts, as well as regions with the greatest decrease in ice surface elevation in TraCE-21ka. Accumulation–temperature scaling relationships are fairly linear and constant in the continental interior, but exhibit higher variability in the early to mid-Holocene over coastal regions. Circum-Antarctic coastal ocean temperatures at grounding line depths are highly sensitive to the meltwater forcings prescribed in each simulation, which are applied in different ways due to limited paleo-constraints. Meltwater forcing associated with the Meltwater Pulse 1A (MWP1A) event results in subsurface warming that is most pronounced in the Amundsen and Bellingshausen Sea sector in both models. Although modelled centennial-scale rates of temperature and accumulation change are reasonable, clear model–proxy mismatches are observed with regard to the timing and duration of the Antarctic Cold Reversal (ACR) and Younger Dryas–early Holocene warming, which may suggest model bias in large-scale ocean circulation, biases in temperature reconstructions from proxy records, or that the MWP1A and 1B events are inadequately represented in these simulations. The incorporation of dynamic ice sheet models in future transient climate ... Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Ice Sheet Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Bellingshausen Sea Climate of the Past 15 1 189 215 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 D. P. Lowry N. R. Golledge L. Menviel N. A. N. Bertler Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Constraining Antarctica's climate evolution since the end of the Last Glacial Maximum ( ∼18 ka) remains a key challenge, but is important for accurately projecting future changes in Antarctic ice sheet mass balance. Here we perform a spatial and temporal analysis of two transient deglacial climate simulations, one using a fully coupled GCM (TraCE-21ka) and one using an intermediate complexity model (LOVECLIM DG ns ), to determine regional differences in deglacial climate evolution and identify the main strengths and limitations of the models in terms of climate variables that impact ice sheet mass balance. The greatest continental surface warming is observed over the continental margins in both models, with strong correlations between surface albedo, sea ice coverage, and surface air temperature along the coasts, as well as regions with the greatest decrease in ice surface elevation in TraCE-21ka. Accumulation–temperature scaling relationships are fairly linear and constant in the continental interior, but exhibit higher variability in the early to mid-Holocene over coastal regions. Circum-Antarctic coastal ocean temperatures at grounding line depths are highly sensitive to the meltwater forcings prescribed in each simulation, which are applied in different ways due to limited paleo-constraints. Meltwater forcing associated with the Meltwater Pulse 1A (MWP1A) event results in subsurface warming that is most pronounced in the Amundsen and Bellingshausen Sea sector in both models. Although modelled centennial-scale rates of temperature and accumulation change are reasonable, clear model–proxy mismatches are observed with regard to the timing and duration of the Antarctic Cold Reversal (ACR) and Younger Dryas–early Holocene warming, which may suggest model bias in large-scale ocean circulation, biases in temperature reconstructions from proxy records, or that the MWP1A and 1B events are inadequately represented in these simulations. The incorporation of dynamic ice sheet models in future transient climate ... |
format |
Article in Journal/Newspaper |
author |
D. P. Lowry N. R. Golledge L. Menviel N. A. N. Bertler |
author_facet |
D. P. Lowry N. R. Golledge L. Menviel N. A. N. Bertler |
author_sort |
D. P. Lowry |
title |
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
title_short |
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
title_full |
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
title_fullStr |
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
title_full_unstemmed |
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations |
title_sort |
deglacial evolution of regional antarctic climate and southern ocean conditions in transient climate simulations |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-15-189-2019 https://doaj.org/article/8533e2c70b884c53bf00479ee95c3cbe |
geographic |
Antarctic Southern Ocean The Antarctic Bellingshausen Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Bellingshausen Sea |
genre |
Antarc* Antarctic Bellingshausen Sea Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Bellingshausen Sea Ice Sheet Sea ice Southern Ocean |
op_source |
Climate of the Past, Vol 15, Pp 189-215 (2019) |
op_relation |
https://www.clim-past.net/15/189/2019/cp-15-189-2019.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-15-189-2019 1814-9324 1814-9332 https://doaj.org/article/8533e2c70b884c53bf00479ee95c3cbe |
op_doi |
https://doi.org/10.5194/cp-15-189-2019 |
container_title |
Climate of the Past |
container_volume |
15 |
container_issue |
1 |
container_start_page |
189 |
op_container_end_page |
215 |
_version_ |
1766245219288743936 |