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...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
ODU Digital Commons
2021
|
Subjects: | |
Online Access: | https://digitalcommons.odu.edu/oeas_fac_pubs/405 https://doi.org/10.1029/2020JC016970 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1416/viewcontent/JGR_Oceans___2021___Frederikse___Constraining_20th_Century_Sea_Level_Rise_in_the_South_Atlantic_Ocean.pdf |
id |
ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1416 |
---|---|
record_format |
openpolar |
spelling |
ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1416 2023-06-11T04:16:40+02:00 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 2021-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/405 https://doi.org/10.1029/2020JC016970 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1416/viewcontent/JGR_Oceans___2021___Frederikse___Constraining_20th_Century_Sea_Level_Rise_in_the_South_Atlantic_Ocean.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/405 doi:10.1029/2020JC016970 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1416/viewcontent/JGR_Oceans___2021___Frederikse___Constraining_20th_Century_Sea_Level_Rise_in_the_South_Atlantic_Ocean.pdf © 2021. American Geophysical Union. All Rights Reserved. Publisher policy indicates the published version can be uploaded to an institutional repository after a 6 month embargo. OES Faculty Publications Absolute sea level change Ocean dynamics Ocean temperature Seawater salinity South Atlantic Ocean Data rescue Salt-marsh proxies Sea level changes South Atlantic Tide gauges Climate Hydrology Oceanography article 2021 ftolddominionuni https://doi.org/10.1029/2020JC016970 2023-05-08T18:01:05Z 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 Old Dominion University: ODU Digital Commons Journal of Geophysical Research: Oceans 126 3 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Absolute sea level change Ocean dynamics Ocean temperature Seawater salinity South Atlantic Ocean Data rescue Salt-marsh proxies Sea level changes South Atlantic Tide gauges Climate Hydrology Oceanography |
spellingShingle |
Absolute sea level change Ocean dynamics Ocean temperature Seawater salinity South Atlantic Ocean Data rescue Salt-marsh proxies Sea level changes South Atlantic Tide gauges Climate Hydrology Oceanography 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 |
topic_facet |
Absolute sea level change Ocean dynamics Ocean temperature Seawater salinity South Atlantic Ocean Data rescue Salt-marsh proxies Sea level changes South Atlantic Tide gauges Climate Hydrology Oceanography |
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 |
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 |
publisher |
ODU Digital Commons |
publishDate |
2021 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/405 https://doi.org/10.1029/2020JC016970 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1416/viewcontent/JGR_Oceans___2021___Frederikse___Constraining_20th_Century_Sea_Level_Rise_in_the_South_Atlantic_Ocean.pdf |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/405 doi:10.1029/2020JC016970 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1416/viewcontent/JGR_Oceans___2021___Frederikse___Constraining_20th_Century_Sea_Level_Rise_in_the_South_Atlantic_Ocean.pdf |
op_rights |
© 2021. American Geophysical Union. All Rights Reserved. Publisher policy indicates the published version can be uploaded to an institutional repository after a 6 month embargo. |
op_doi |
https://doi.org/10.1029/2020JC016970 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
3 |
_version_ |
1768375148762628096 |