Global Ocean Cooling of 2.3°C During the Last Glacial Maximum
Abstract Quantitative constraints on past mean ocean temperature (MOT) critically inform our historical understanding of Earth's energy balance. A recently developed MOT proxy based on paleoatmospheric Xe, Kr, and N2 ratios in ice core air bubbles is a promising tool rooted in the temperature d...
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ftdoajarticles:oai:doaj.org/article:42d0da9b4caa402382a0a93fe10742fd 2024-09-09T19:44:54+00:00 Global Ocean Cooling of 2.3°C During the Last Glacial Maximum A. M. Seltzer P. W. Davidson S. A. Shackleton D. P. Nicholson S. Khatiwala 2024-05-01T00:00:00Z https://doi.org/10.1029/2024GL108866 https://doaj.org/article/42d0da9b4caa402382a0a93fe10742fd EN eng Wiley https://doi.org/10.1029/2024GL108866 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL108866 https://doaj.org/article/42d0da9b4caa402382a0a93fe10742fd Geophysical Research Letters, Vol 51, Iss 9, Pp n/a-n/a (2024) gas exchange ocean heat Last Glacial Maximum ice cores noble gases paleoclimate Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL108866 2024-08-05T17:49:23Z Abstract Quantitative constraints on past mean ocean temperature (MOT) critically inform our historical understanding of Earth's energy balance. A recently developed MOT proxy based on paleoatmospheric Xe, Kr, and N2 ratios in ice core air bubbles is a promising tool rooted in the temperature dependences of gas solubilities. However, these inert gases are systematically undersaturated in the modern ocean interior, and it remains unclear how air‐sea disequilibrium may have changed in the past. Here, we carry out 30 tracer‐enabled model simulations under varying circulation, sea ice cover, and wind stress regimes to evaluate air‐sea disequilibrium in the Last Glacial Maximum (LGM) ocean. We find that undersaturation of all three gases was likely reduced, primarily due to strengthened high‐latitude winds, biasing reconstructed MOT by −0.38 ± 0.37°C (1σ). Accounting for air‐sea disequilibrium, paleoatmospheric inert gases indicate that LGM MOT was 2.27 ± 0.46°C (1σ) colder than the pre‐industrial era. Article in Journal/Newspaper ice core Sea ice Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
gas exchange ocean heat Last Glacial Maximum ice cores noble gases paleoclimate Geophysics. Cosmic physics QC801-809 |
spellingShingle |
gas exchange ocean heat Last Glacial Maximum ice cores noble gases paleoclimate Geophysics. Cosmic physics QC801-809 A. M. Seltzer P. W. Davidson S. A. Shackleton D. P. Nicholson S. Khatiwala Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
topic_facet |
gas exchange ocean heat Last Glacial Maximum ice cores noble gases paleoclimate Geophysics. Cosmic physics QC801-809 |
description |
Abstract Quantitative constraints on past mean ocean temperature (MOT) critically inform our historical understanding of Earth's energy balance. A recently developed MOT proxy based on paleoatmospheric Xe, Kr, and N2 ratios in ice core air bubbles is a promising tool rooted in the temperature dependences of gas solubilities. However, these inert gases are systematically undersaturated in the modern ocean interior, and it remains unclear how air‐sea disequilibrium may have changed in the past. Here, we carry out 30 tracer‐enabled model simulations under varying circulation, sea ice cover, and wind stress regimes to evaluate air‐sea disequilibrium in the Last Glacial Maximum (LGM) ocean. We find that undersaturation of all three gases was likely reduced, primarily due to strengthened high‐latitude winds, biasing reconstructed MOT by −0.38 ± 0.37°C (1σ). Accounting for air‐sea disequilibrium, paleoatmospheric inert gases indicate that LGM MOT was 2.27 ± 0.46°C (1σ) colder than the pre‐industrial era. |
format |
Article in Journal/Newspaper |
author |
A. M. Seltzer P. W. Davidson S. A. Shackleton D. P. Nicholson S. Khatiwala |
author_facet |
A. M. Seltzer P. W. Davidson S. A. Shackleton D. P. Nicholson S. Khatiwala |
author_sort |
A. M. Seltzer |
title |
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
title_short |
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
title_full |
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
title_fullStr |
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
title_full_unstemmed |
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum |
title_sort |
global ocean cooling of 2.3°c during the last glacial maximum |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL108866 https://doaj.org/article/42d0da9b4caa402382a0a93fe10742fd |
genre |
ice core Sea ice |
genre_facet |
ice core Sea ice |
op_source |
Geophysical Research Letters, Vol 51, Iss 9, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL108866 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL108866 https://doaj.org/article/42d0da9b4caa402382a0a93fe10742fd |
op_doi |
https://doi.org/10.1029/2024GL108866 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
9 |
_version_ |
1809914559164579840 |