Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study
The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism for large-scale northward heat transport and thus plays an important role for global climate. Relatively warm water is transported northward in the upper layers of the North Atlantic Ocean and, after cooling at subpolar latitu...
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Copernicus Publications
2015
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00014432 2023-05-15T17:34:47+02:00 Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study Bentel, K. Landerer, F. W. Boening, C. 2015-12 electronic https://doi.org/10.5194/os-11-953-2015 https://noa.gwlb.de/receive/cop_mods_00014432 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014387/os-11-953-2015.pdf https://os.copernicus.org/articles/11/953/2015/os-11-953-2015.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-11-953-2015 https://noa.gwlb.de/receive/cop_mods_00014432 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014387/os-11-953-2015.pdf https://os.copernicus.org/articles/11/953/2015/os-11-953-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/os-11-953-2015 2022-02-08T22:55:07Z The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism for large-scale northward heat transport and thus plays an important role for global climate. Relatively warm water is transported northward in the upper layers of the North Atlantic Ocean and, after cooling at subpolar latitudes, sinks down and is transported back south in the deeper limb of the AMOC. The utility of in situ ocean bottom pressure (OBP) observations to infer AMOC changes at single latitudes has been characterized in the recent literature using output from ocean models. We extend the analysis and examine the utility of space-based observations of time-variable gravity and the inversion for ocean bottom pressure to monitor AMOC changes and variability between 20 and 60° N. Consistent with previous results, we find a strong correlation between the AMOC signal and OBP variations, mainly along the western slope of the Atlantic Basin. We then use synthetic OBP data – smoothed and filtered to resemble the resolution of the GRACE (Gravity Recovery and Climate Experiment) gravity mission, but without errors – and reconstruct geostrophic AMOC transport. Due to the coarse resolution of GRACE-like OBP fields, we find that leakage of signal across the step slopes of the ocean basin is a significant challenge at certain latitudes. Transport signal rms is of a similar order of magnitude as error rms for the reconstructed time series. However, the interannual AMOC anomaly time series can be recovered from 20 years of monthly GRACE-like OBP fields with errors less than 1 sverdrup in many locations. Article in Journal/Newspaper North Atlantic Niedersächsisches Online-Archiv NOA Ocean Science 11 6 953 963 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Bentel, K. Landerer, F. W. Boening, C. Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
topic_facet |
article Verlagsveröffentlichung |
description |
The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism for large-scale northward heat transport and thus plays an important role for global climate. Relatively warm water is transported northward in the upper layers of the North Atlantic Ocean and, after cooling at subpolar latitudes, sinks down and is transported back south in the deeper limb of the AMOC. The utility of in situ ocean bottom pressure (OBP) observations to infer AMOC changes at single latitudes has been characterized in the recent literature using output from ocean models. We extend the analysis and examine the utility of space-based observations of time-variable gravity and the inversion for ocean bottom pressure to monitor AMOC changes and variability between 20 and 60° N. Consistent with previous results, we find a strong correlation between the AMOC signal and OBP variations, mainly along the western slope of the Atlantic Basin. We then use synthetic OBP data – smoothed and filtered to resemble the resolution of the GRACE (Gravity Recovery and Climate Experiment) gravity mission, but without errors – and reconstruct geostrophic AMOC transport. Due to the coarse resolution of GRACE-like OBP fields, we find that leakage of signal across the step slopes of the ocean basin is a significant challenge at certain latitudes. Transport signal rms is of a similar order of magnitude as error rms for the reconstructed time series. However, the interannual AMOC anomaly time series can be recovered from 20 years of monthly GRACE-like OBP fields with errors less than 1 sverdrup in many locations. |
format |
Article in Journal/Newspaper |
author |
Bentel, K. Landerer, F. W. Boening, C. |
author_facet |
Bentel, K. Landerer, F. W. Boening, C. |
author_sort |
Bentel, K. |
title |
Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
title_short |
Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
title_full |
Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
title_fullStr |
Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
title_full_unstemmed |
Monitoring Atlantic overturning circulation and transport variability with GRACE-type ocean bottom pressure observations – a sensitivity study |
title_sort |
monitoring atlantic overturning circulation and transport variability with grace-type ocean bottom pressure observations – a sensitivity study |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/os-11-953-2015 https://noa.gwlb.de/receive/cop_mods_00014432 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014387/os-11-953-2015.pdf https://os.copernicus.org/articles/11/953/2015/os-11-953-2015.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-11-953-2015 https://noa.gwlb.de/receive/cop_mods_00014432 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014387/os-11-953-2015.pdf https://os.copernicus.org/articles/11/953/2015/os-11-953-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-11-953-2015 |
container_title |
Ocean Science |
container_volume |
11 |
container_issue |
6 |
container_start_page |
953 |
op_container_end_page |
963 |
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1766133711934324736 |