Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites
Stable water isotopes in polar ice cores are widely used to reconstruct past temperature variations over several orbital climatic cycles. One way to calibrate the isotope–temperature relationship is to apply the present-day spatial relationship as a surrogate for the temporal one. However, this meth...
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ftcopernicus:oai:publications.copernicus.org:cp109056 2023-07-23T04:15:43+02:00 Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites Cauquoin, Alexandre Abe-Ouchi, Ayako Obase, Takashi Chan, Wing-Le Paul, André Werner, Martin 2023-06-26 application/pdf https://doi.org/10.5194/cp-19-1275-2023 https://cp.copernicus.org/articles/19/1275/2023/ eng eng doi:10.5194/cp-19-1275-2023 https://cp.copernicus.org/articles/19/1275/2023/ eISSN: 1814-9332 Text 2023 ftcopernicus https://doi.org/10.5194/cp-19-1275-2023 2023-07-03T16:24:18Z Stable water isotopes in polar ice cores are widely used to reconstruct past temperature variations over several orbital climatic cycles. One way to calibrate the isotope–temperature relationship is to apply the present-day spatial relationship as a surrogate for the temporal one. However, this method leads to large uncertainties because several factors like the sea surface conditions or the origin and transport of water vapor influence the isotope–temperature temporal slope. In this study, we investigate how the sea surface temperature (SST), the sea ice extent, and the strength of the Atlantic Meridional Overturning Circulation (AMOC) affect these temporal slopes in Greenland and Antarctica for Last Glacial Maximum (LGM, ∼ 21 000 years ago) to preindustrial climate change. For that, we use the isotope-enabled atmosphere climate model ECHAM6-wiso, forced with a set of sea surface boundary condition datasets based on reconstructions (e.g., GLOMAP) or MIROC 4m simulation outputs. We found that the isotope–temperature temporal slopes in East Antarctic coastal areas are mainly controlled by the sea ice extent, while the sea surface temperature cooling affects the temporal slope values inland more. On the other hand, ECHAM6-wiso simulates the impact of sea ice extent on the EPICA Dome C (EDC) and Vostok sites through the contribution of water vapor from lower latitudes. Effects of sea surface boundary condition changes on modeled isotope–temperature temporal slopes are variable in West Antarctica. This is partly due to the transport of water vapor from the Southern Ocean to this area that can dampen the influence of local temperature on the changes in the isotopic composition of precipitation and snow. In the Greenland area, the isotope–temperature temporal slopes are influenced by the sea surface temperatures near the coasts of the continent. The greater the LGM cooling off the coast of southeastern Greenland, the greater the transport of water vapor from the North Atlantic, and the larger the temporal slopes. The ... Text Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic Sea ice Southern Ocean West Antarctica Copernicus Publications: E-Journals Antarctic Greenland Southern Ocean West Antarctica Climate of the Past 19 6 1275 1294 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Stable water isotopes in polar ice cores are widely used to reconstruct past temperature variations over several orbital climatic cycles. One way to calibrate the isotope–temperature relationship is to apply the present-day spatial relationship as a surrogate for the temporal one. However, this method leads to large uncertainties because several factors like the sea surface conditions or the origin and transport of water vapor influence the isotope–temperature temporal slope. In this study, we investigate how the sea surface temperature (SST), the sea ice extent, and the strength of the Atlantic Meridional Overturning Circulation (AMOC) affect these temporal slopes in Greenland and Antarctica for Last Glacial Maximum (LGM, ∼ 21 000 years ago) to preindustrial climate change. For that, we use the isotope-enabled atmosphere climate model ECHAM6-wiso, forced with a set of sea surface boundary condition datasets based on reconstructions (e.g., GLOMAP) or MIROC 4m simulation outputs. We found that the isotope–temperature temporal slopes in East Antarctic coastal areas are mainly controlled by the sea ice extent, while the sea surface temperature cooling affects the temporal slope values inland more. On the other hand, ECHAM6-wiso simulates the impact of sea ice extent on the EPICA Dome C (EDC) and Vostok sites through the contribution of water vapor from lower latitudes. Effects of sea surface boundary condition changes on modeled isotope–temperature temporal slopes are variable in West Antarctica. This is partly due to the transport of water vapor from the Southern Ocean to this area that can dampen the influence of local temperature on the changes in the isotopic composition of precipitation and snow. In the Greenland area, the isotope–temperature temporal slopes are influenced by the sea surface temperatures near the coasts of the continent. The greater the LGM cooling off the coast of southeastern Greenland, the greater the transport of water vapor from the North Atlantic, and the larger the temporal slopes. The ... |
format |
Text |
author |
Cauquoin, Alexandre Abe-Ouchi, Ayako Obase, Takashi Chan, Wing-Le Paul, André Werner, Martin |
spellingShingle |
Cauquoin, Alexandre Abe-Ouchi, Ayako Obase, Takashi Chan, Wing-Le Paul, André Werner, Martin Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
author_facet |
Cauquoin, Alexandre Abe-Ouchi, Ayako Obase, Takashi Chan, Wing-Le Paul, André Werner, Martin |
author_sort |
Cauquoin, Alexandre |
title |
Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
title_short |
Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
title_full |
Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
title_fullStr |
Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
title_full_unstemmed |
Effects of Last Glacial Maximum (LGM) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
title_sort |
effects of last glacial maximum (lgm) sea surface temperature and sea ice extent on the isotope–temperature slope at polar ice core sites |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-1275-2023 https://cp.copernicus.org/articles/19/1275/2023/ |
geographic |
Antarctic Greenland Southern Ocean West Antarctica |
geographic_facet |
Antarctic Greenland Southern Ocean West Antarctica |
genre |
Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic Sea ice Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic Sea ice Southern Ocean West Antarctica |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-19-1275-2023 https://cp.copernicus.org/articles/19/1275/2023/ |
op_doi |
https://doi.org/10.5194/cp-19-1275-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
6 |
container_start_page |
1275 |
op_container_end_page |
1294 |
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1772176693192032256 |