On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s
Abstract The density stratification in the ocean is directly related to the diapycnal mixing, which drives the abyssal cell of the Meridional Overturning Circulation (MOC). It is important to understand how stratification has been changing in the world's deep and abyssal oceans under climate ch...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2022GL102422 https://doaj.org/article/c86a4287094640c2a3dc1da405305f20 |
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ftdoajarticles:oai:doaj.org/article:c86a4287094640c2a3dc1da405305f20 2024-09-15T17:47:33+00:00 On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s Shuwen Tan Andreas M. Thurnherr 2023-06-01T00:00:00Z https://doi.org/10.1029/2022GL102422 https://doaj.org/article/c86a4287094640c2a3dc1da405305f20 EN eng Wiley https://doi.org/10.1029/2022GL102422 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL102422 https://doaj.org/article/c86a4287094640c2a3dc1da405305f20 Geophysical Research Letters, Vol 50, Iss 11, Pp n/a-n/a (2023) deep ocean decadal change ocean stratification Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2022GL102422 2024-08-05T17:49:23Z Abstract The density stratification in the ocean is directly related to the diapycnal mixing, which drives the abyssal cell of the Meridional Overturning Circulation (MOC). It is important to understand how stratification has been changing in the world's deep and abyssal oceans under climate change. Using repeat hydrographic data obtained since the 1990s, we find a decreasing stratification associated with changes in the source Antarctica Bottom Water (AABW) properties in its formation basins as well as in basins along its dispersal pathways. Averaged south of 60°S, the squared buoyancy frequency N2 shows a negative trend of −6% per decade in waters deeper than 4,000 m. The observed decadal reduction in stratification is associated with large spatial variability, especially in the Southern Ocean basins with multiple AABW sources. Additionally, there are also significant differences between neighboring basins that are related to the blocking effect of topography. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
deep ocean decadal change ocean stratification Geophysics. Cosmic physics QC801-809 |
spellingShingle |
deep ocean decadal change ocean stratification Geophysics. Cosmic physics QC801-809 Shuwen Tan Andreas M. Thurnherr On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
topic_facet |
deep ocean decadal change ocean stratification Geophysics. Cosmic physics QC801-809 |
description |
Abstract The density stratification in the ocean is directly related to the diapycnal mixing, which drives the abyssal cell of the Meridional Overturning Circulation (MOC). It is important to understand how stratification has been changing in the world's deep and abyssal oceans under climate change. Using repeat hydrographic data obtained since the 1990s, we find a decreasing stratification associated with changes in the source Antarctica Bottom Water (AABW) properties in its formation basins as well as in basins along its dispersal pathways. Averaged south of 60°S, the squared buoyancy frequency N2 shows a negative trend of −6% per decade in waters deeper than 4,000 m. The observed decadal reduction in stratification is associated with large spatial variability, especially in the Southern Ocean basins with multiple AABW sources. Additionally, there are also significant differences between neighboring basins that are related to the blocking effect of topography. |
format |
Article in Journal/Newspaper |
author |
Shuwen Tan Andreas M. Thurnherr |
author_facet |
Shuwen Tan Andreas M. Thurnherr |
author_sort |
Shuwen Tan |
title |
On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
title_short |
On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
title_full |
On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
title_fullStr |
On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
title_full_unstemmed |
On the Global Decrease in the Deep and Abyssal Density Stratification Along the Spreading Pathways of Antarctic Bottom Water Since the 1990s |
title_sort |
on the global decrease in the deep and abyssal density stratification along the spreading pathways of antarctic bottom water since the 1990s |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GL102422 https://doaj.org/article/c86a4287094640c2a3dc1da405305f20 |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
Geophysical Research Letters, Vol 50, Iss 11, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022GL102422 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL102422 https://doaj.org/article/c86a4287094640c2a3dc1da405305f20 |
op_doi |
https://doi.org/10.1029/2022GL102422 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
11 |
_version_ |
1810496964192632832 |