Advances in reconstructing the AMOC using sea surface observations of salinity
The Atlantic meridional overturning circulation (AMOC) is one of the main drivers of climate variability at decadal and longer time scales. As there are no direct multi-decadal observations of this key circulation, the reconstruction of past AMOC variations is essential. This work presents a step fo...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/187269 2024-02-11T10:01:42+01:00 Advances in reconstructing the AMOC using sea surface observations of salinity ESTELLA-PEREZ, Victor MIGNOT, Juliette GUILYARDI, Éric SWINGEDOUW, Didier REVERDIN, Gilles 2020-06 https://oskar-bordeaux.fr/handle/20.500.12278/187269 https://hdl.handle.net/20.500.12278/187269 https://doi.org/10.1007/s00382-020-05304-4 EN eng 0930-7575 https://oskar-bordeaux.fr/handle/20.500.12278/187269 doi:10.1007/s00382-020-05304-4 open Pas de Licence CC Planète et Univers [physics]/Sciences de la Terre/Océanographie Article de revue 2020 ftoskarbordeaux https://doi.org/20.500.12278/18726910.1007/s00382-020-05304-4 2024-01-23T23:30:48Z The Atlantic meridional overturning circulation (AMOC) is one of the main drivers of climate variability at decadal and longer time scales. As there are no direct multi-decadal observations of this key circulation, the reconstruction of past AMOC variations is essential. This work presents a step forward in reconstructing the AMOC using climate models and time-varying surface nudging of salinity and temperature data, for which independent multi-decadal observed series are available. A number of nudging protocols are explored in a perfect model framework to best reproduce the AMOC variability accommodating to the characteristics of SST and SSS available products. As reference SST products with sufficient space and time coverage are available, we here choose to focus on the limitations associated to SSS products with the goal of providing protocols using independent salinity products. We consider a global gridded dataset and, additionally, a coarser SSS dataset restricted to the Atlantic and with a quite low spatial resolution (order of 10 degrees vs. 2 for the model grid). We show how, using the latter, we can improve the efficiency of the nudging on the AMOC reconstruction by adding a high-resolution annual cycle to the coarse resolution SSS product as well as a spatial downscaling to account for SSS gradient. The final protocol retained for the coarse SSS data is able to reconstruct a 100-year long AMOC period (average of 10.18 Sv and a standard deviation of 1.39 Sv), with a correlation of 0.76 to the target and a RMSE of 0.99 Sv. These values can be respectively compared to 0.85 and 0.75 Sv when using the global salinity surface observations. This work provides a first step towards understanding the limitations and prospects of historical AMOC reconstructions using different sea surface salinity datasets for the surface nudging. Changement climatique et Arctique et circulation océanique globale IPSL Climate graduate school Blue-Action: Arctic impact on weather and climat Article in Journal/Newspaper Arctic Arctique* OSKAR Bordeaux (Open Science Knowledge ARchive) Arctic Climate Dynamics 55 3-4 975 992 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Océanographie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Océanographie ESTELLA-PEREZ, Victor MIGNOT, Juliette GUILYARDI, Éric SWINGEDOUW, Didier REVERDIN, Gilles Advances in reconstructing the AMOC using sea surface observations of salinity |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Océanographie |
description |
The Atlantic meridional overturning circulation (AMOC) is one of the main drivers of climate variability at decadal and longer time scales. As there are no direct multi-decadal observations of this key circulation, the reconstruction of past AMOC variations is essential. This work presents a step forward in reconstructing the AMOC using climate models and time-varying surface nudging of salinity and temperature data, for which independent multi-decadal observed series are available. A number of nudging protocols are explored in a perfect model framework to best reproduce the AMOC variability accommodating to the characteristics of SST and SSS available products. As reference SST products with sufficient space and time coverage are available, we here choose to focus on the limitations associated to SSS products with the goal of providing protocols using independent salinity products. We consider a global gridded dataset and, additionally, a coarser SSS dataset restricted to the Atlantic and with a quite low spatial resolution (order of 10 degrees vs. 2 for the model grid). We show how, using the latter, we can improve the efficiency of the nudging on the AMOC reconstruction by adding a high-resolution annual cycle to the coarse resolution SSS product as well as a spatial downscaling to account for SSS gradient. The final protocol retained for the coarse SSS data is able to reconstruct a 100-year long AMOC period (average of 10.18 Sv and a standard deviation of 1.39 Sv), with a correlation of 0.76 to the target and a RMSE of 0.99 Sv. These values can be respectively compared to 0.85 and 0.75 Sv when using the global salinity surface observations. This work provides a first step towards understanding the limitations and prospects of historical AMOC reconstructions using different sea surface salinity datasets for the surface nudging. Changement climatique et Arctique et circulation océanique globale IPSL Climate graduate school Blue-Action: Arctic impact on weather and climat |
format |
Article in Journal/Newspaper |
author |
ESTELLA-PEREZ, Victor MIGNOT, Juliette GUILYARDI, Éric SWINGEDOUW, Didier REVERDIN, Gilles |
author_facet |
ESTELLA-PEREZ, Victor MIGNOT, Juliette GUILYARDI, Éric SWINGEDOUW, Didier REVERDIN, Gilles |
author_sort |
ESTELLA-PEREZ, Victor |
title |
Advances in reconstructing the AMOC using sea surface observations of salinity |
title_short |
Advances in reconstructing the AMOC using sea surface observations of salinity |
title_full |
Advances in reconstructing the AMOC using sea surface observations of salinity |
title_fullStr |
Advances in reconstructing the AMOC using sea surface observations of salinity |
title_full_unstemmed |
Advances in reconstructing the AMOC using sea surface observations of salinity |
title_sort |
advances in reconstructing the amoc using sea surface observations of salinity |
publishDate |
2020 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/187269 https://hdl.handle.net/20.500.12278/187269 https://doi.org/10.1007/s00382-020-05304-4 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctique* |
genre_facet |
Arctic Arctique* |
op_relation |
0930-7575 https://oskar-bordeaux.fr/handle/20.500.12278/187269 doi:10.1007/s00382-020-05304-4 |
op_rights |
open Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/18726910.1007/s00382-020-05304-4 |
container_title |
Climate Dynamics |
container_volume |
55 |
container_issue |
3-4 |
container_start_page |
975 |
op_container_end_page |
992 |
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1790597505241579520 |