Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s
The Antarctic continental margin supplies the densest bottom water to the global abyss. From the late twentieth century, an acceleration in the long-term freshening of Antarctic Bottom Waters (AABW) has been detected in the Australian-Antarctic Basin. Our latest hydrographic observations reveal that...
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ftpubmed:oai:pubmedcentral.nih.gov:7492216 2023-05-15T13:39:39+02:00 Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s Aoki, S. Yamazaki, K. Hirano, D. Katsumata, K. Shimada, K. Kitade, Y. Sasaki, H. Murase, H. 2020-09-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492216/ https://doi.org/10.1038/s41598-020-71290-6 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492216/ http://dx.doi.org/10.1038/s41598-020-71290-6 © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Sci Rep Article Text 2020 ftpubmed https://doi.org/10.1038/s41598-020-71290-6 2020-09-20T00:42:22Z The Antarctic continental margin supplies the densest bottom water to the global abyss. From the late twentieth century, an acceleration in the long-term freshening of Antarctic Bottom Waters (AABW) has been detected in the Australian-Antarctic Basin. Our latest hydrographic observations reveal that, in the late 2010s, the freshening trend has reversed broadly over the continental slope. Near-bottom salinities in 2018–2019 were higher than during 2011–2015. Along 170° E, the salinity increase between 2011 and 2018 was greater than that observed in the west. The layer thickness of the densest AABW increased during the 2010s, suggesting that the Ross Sea Bottom Water intensification was a major source of the salinity increase. Freshwater content on the continental slope decreased at a rate of 58 ± 37 Gt/a in the near-bottom layer. The decadal change is very likely due to changes in Ross Sea shelf water attributable to a decrease in meltwater from West Antarctic ice shelves for the corresponding period. Text Antarc* Antarctic Ice Shelves Ross Sea PubMed Central (PMC) Antarctic Australian Antarctic Basin ENVELOPE(120.000,120.000,-60.000,-60.000) Australian-Antarctic Basin ENVELOPE(134.115,134.115,-58.800,-58.800) Ross Sea The Antarctic Scientific Reports 10 1 |
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Article Aoki, S. Yamazaki, K. Hirano, D. Katsumata, K. Shimada, K. Kitade, Y. Sasaki, H. Murase, H. Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
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Article |
description |
The Antarctic continental margin supplies the densest bottom water to the global abyss. From the late twentieth century, an acceleration in the long-term freshening of Antarctic Bottom Waters (AABW) has been detected in the Australian-Antarctic Basin. Our latest hydrographic observations reveal that, in the late 2010s, the freshening trend has reversed broadly over the continental slope. Near-bottom salinities in 2018–2019 were higher than during 2011–2015. Along 170° E, the salinity increase between 2011 and 2018 was greater than that observed in the west. The layer thickness of the densest AABW increased during the 2010s, suggesting that the Ross Sea Bottom Water intensification was a major source of the salinity increase. Freshwater content on the continental slope decreased at a rate of 58 ± 37 Gt/a in the near-bottom layer. The decadal change is very likely due to changes in Ross Sea shelf water attributable to a decrease in meltwater from West Antarctic ice shelves for the corresponding period. |
format |
Text |
author |
Aoki, S. Yamazaki, K. Hirano, D. Katsumata, K. Shimada, K. Kitade, Y. Sasaki, H. Murase, H. |
author_facet |
Aoki, S. Yamazaki, K. Hirano, D. Katsumata, K. Shimada, K. Kitade, Y. Sasaki, H. Murase, H. |
author_sort |
Aoki, S. |
title |
Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
title_short |
Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
title_full |
Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
title_fullStr |
Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
title_full_unstemmed |
Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s |
title_sort |
reversal of freshening trend of antarctic bottom water in the australian-antarctic basin during 2010s |
publisher |
Nature Publishing Group UK |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492216/ https://doi.org/10.1038/s41598-020-71290-6 |
long_lat |
ENVELOPE(120.000,120.000,-60.000,-60.000) ENVELOPE(134.115,134.115,-58.800,-58.800) |
geographic |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Ross Sea The Antarctic |
geographic_facet |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Shelves Ross Sea |
genre_facet |
Antarc* Antarctic Ice Shelves Ross Sea |
op_source |
Sci Rep |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492216/ http://dx.doi.org/10.1038/s41598-020-71290-6 |
op_rights |
© The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-020-71290-6 |
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