Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean
Sea level in the South Atlantic Ocean has only been measured at a small number of tide-gauge locations, which causes considerable uncertainty in 20th-century sea-level trend estimates in this basin. To obtain a better-constrained sea-level trend in the South Atlantic Ocean, this study aims to answer...
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Online Access: | https://eprints.whiterose.ac.uk/175148/ https://eprints.whiterose.ac.uk/175148/1/south_atlantic_si_2_.pdf https://doi.org/10.1029/2020JC016970 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:175148 2024-04-21T08:11:34+00:00 Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean Frederikse, Thomas Adhikari, Surendra Daley, Tim J. Dangendorf, Sönke Gehrels, Roland Landerer, Felix Marcos, Marta Newton, Thomas L. Rush, Graham Slangen, Aimée B.A. Wöppelmann, Guy 2021-03-12 text https://eprints.whiterose.ac.uk/175148/ https://eprints.whiterose.ac.uk/175148/1/south_atlantic_si_2_.pdf https://doi.org/10.1029/2020JC016970 en eng https://eprints.whiterose.ac.uk/175148/1/south_atlantic_si_2_.pdf Frederikse, Thomas, Adhikari, Surendra, Daley, Tim J. et al. (8 more authors) (2021) Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean. Journal of Geophysical Research: Oceans. e2020JC016970. ISSN 2169-9291 Article PeerReviewed 2021 ftleedsuniv https://doi.org/10.1029/2020JC016970 2024-03-27T15:03:10Z Sea level in the South Atlantic Ocean has only been measured at a small number of tide-gauge locations, which causes considerable uncertainty in 20th-century sea-level trend estimates in this basin. To obtain a better-constrained sea-level trend in the South Atlantic Ocean, this study aims to answer two questions. The first question is: can we combine new observations, vertical land motion estimates, and information on spatial sampling biases to obtain a likely range of 20th-century sea-level rise in the South Atlantic? We combine existing observations with recovered observations from Dakar and a high-resolution sea-level reconstruction based on salt-marsh sediments from the Falkland Islands and find that the rate of sea-level rise in the South Atlantic has likely been between 1.1 and 2.2 mm year−1 (5%–95% confidence intervals), with a central estimate of 1.6 mm year−1. This rate is on the high side, but not statistically different compared to global-mean trends from recent reconstructions. The second question is: are there any physical processes that could explain a large deviation from the global-mean sea-level trend in the South Atlantic? Sterodynamic (changes in ocean dynamics and steric effects) and gravitation, rotation, and deformation effects related to ice mass loss and land water storage have probably led to a 20th-century sea-level trend in the South Atlantic above the global mean. Both observations and physical processes thus suggest that 20th-century sea-level rise in the South Atlantic has been about 0.3 mm year−1 above the rate of global-mean sea-level rise, although even with the additional observations, the uncertainties are still too large to distinguish a statistically significant difference. Article in Journal/Newspaper South Atlantic Ocean White Rose Research Online (Universities of Leeds, Sheffield & York) Journal of Geophysical Research: Oceans 126 3 |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
description |
Sea level in the South Atlantic Ocean has only been measured at a small number of tide-gauge locations, which causes considerable uncertainty in 20th-century sea-level trend estimates in this basin. To obtain a better-constrained sea-level trend in the South Atlantic Ocean, this study aims to answer two questions. The first question is: can we combine new observations, vertical land motion estimates, and information on spatial sampling biases to obtain a likely range of 20th-century sea-level rise in the South Atlantic? We combine existing observations with recovered observations from Dakar and a high-resolution sea-level reconstruction based on salt-marsh sediments from the Falkland Islands and find that the rate of sea-level rise in the South Atlantic has likely been between 1.1 and 2.2 mm year−1 (5%–95% confidence intervals), with a central estimate of 1.6 mm year−1. This rate is on the high side, but not statistically different compared to global-mean trends from recent reconstructions. The second question is: are there any physical processes that could explain a large deviation from the global-mean sea-level trend in the South Atlantic? Sterodynamic (changes in ocean dynamics and steric effects) and gravitation, rotation, and deformation effects related to ice mass loss and land water storage have probably led to a 20th-century sea-level trend in the South Atlantic above the global mean. Both observations and physical processes thus suggest that 20th-century sea-level rise in the South Atlantic has been about 0.3 mm year−1 above the rate of global-mean sea-level rise, although even with the additional observations, the uncertainties are still too large to distinguish a statistically significant difference. |
format |
Article in Journal/Newspaper |
author |
Frederikse, Thomas Adhikari, Surendra Daley, Tim J. Dangendorf, Sönke Gehrels, Roland Landerer, Felix Marcos, Marta Newton, Thomas L. Rush, Graham Slangen, Aimée B.A. Wöppelmann, Guy |
spellingShingle |
Frederikse, Thomas Adhikari, Surendra Daley, Tim J. Dangendorf, Sönke Gehrels, Roland Landerer, Felix Marcos, Marta Newton, Thomas L. Rush, Graham Slangen, Aimée B.A. Wöppelmann, Guy Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
author_facet |
Frederikse, Thomas Adhikari, Surendra Daley, Tim J. Dangendorf, Sönke Gehrels, Roland Landerer, Felix Marcos, Marta Newton, Thomas L. Rush, Graham Slangen, Aimée B.A. Wöppelmann, Guy |
author_sort |
Frederikse, Thomas |
title |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
title_short |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
title_full |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
title_fullStr |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
title_full_unstemmed |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
title_sort |
constraining 20th-century sea-level rise in the south atlantic ocean |
publishDate |
2021 |
url |
https://eprints.whiterose.ac.uk/175148/ https://eprints.whiterose.ac.uk/175148/1/south_atlantic_si_2_.pdf https://doi.org/10.1029/2020JC016970 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://eprints.whiterose.ac.uk/175148/1/south_atlantic_si_2_.pdf Frederikse, Thomas, Adhikari, Surendra, Daley, Tim J. et al. (8 more authors) (2021) Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean. Journal of Geophysical Research: Oceans. e2020JC016970. ISSN 2169-9291 |
op_doi |
https://doi.org/10.1029/2020JC016970 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
3 |
_version_ |
1796953523026395136 |