North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability
This study investigates the contributions of the ocean’s chaotic intrinsic variability (CIV) and atmospherically-forced variability on the interannual fluctuations of the North Atlantic Eighteen Degree Water (EDW) properties. Utilizing a 1/4° regional 50-member ocean/sea-ice ensemble simulation driv...
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073200 2024-05-19T07:44:49+00:00 North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability Narinc, Olivier Penduff, Thierry Maze, Guillaume Leroux, Stéphanie Molines, Jean-Marc 2024-04 electronic https://doi.org/10.5194/egusphere-2024-1146 https://noa.gwlb.de/receive/cop_mods_00073200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071381/egusphere-2024-1146.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1146/egusphere-2024-1146.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2024-1146 https://noa.gwlb.de/receive/cop_mods_00073200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071381/egusphere-2024-1146.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1146/egusphere-2024-1146.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/egusphere-2024-1146 2024-04-29T23:46:10Z This study investigates the contributions of the ocean’s chaotic intrinsic variability (CIV) and atmospherically-forced variability on the interannual fluctuations of the North Atlantic Eighteen Degree Water (EDW) properties. Utilizing a 1/4° regional 50-member ocean/sea-ice ensemble simulation driven by an original surface forcing method and perturbed initially, the forced variability of EDW properties is estimated from ensemble mean fluctuations, while CIV is determined from deviations around the ensemble mean within each member. The model successfully captures the main features of EDW, showing good agreement with observation-based ARMOR3D data in terms of location, seasonality, mean temperature and volume, and interannual variance of its main properties. CIV significantly impacts EDW, explaining 10–13 and 28–44 % of the interannual variance of its geometric and thermohaline mean properties, respectively, with a maximum imprint on EDW temperature. Observed and simulated intrinsic-to-total variance ratios are mostly consistent, dispelling concerns about a signal-to-noise paradox. This study also illustrates the advantages of ensemble simulations over single simulations in understanding oceanic fluctuations and attributing them to external drivers, while also cautioning against overreliance on individual simulations assessments. Article in Journal/Newspaper North Atlantic Sea ice Niedersächsisches Online-Archiv NOA |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Narinc, Olivier Penduff, Thierry Maze, Guillaume Leroux, Stéphanie Molines, Jean-Marc North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
topic_facet |
article Verlagsveröffentlichung |
description |
This study investigates the contributions of the ocean’s chaotic intrinsic variability (CIV) and atmospherically-forced variability on the interannual fluctuations of the North Atlantic Eighteen Degree Water (EDW) properties. Utilizing a 1/4° regional 50-member ocean/sea-ice ensemble simulation driven by an original surface forcing method and perturbed initially, the forced variability of EDW properties is estimated from ensemble mean fluctuations, while CIV is determined from deviations around the ensemble mean within each member. The model successfully captures the main features of EDW, showing good agreement with observation-based ARMOR3D data in terms of location, seasonality, mean temperature and volume, and interannual variance of its main properties. CIV significantly impacts EDW, explaining 10–13 and 28–44 % of the interannual variance of its geometric and thermohaline mean properties, respectively, with a maximum imprint on EDW temperature. Observed and simulated intrinsic-to-total variance ratios are mostly consistent, dispelling concerns about a signal-to-noise paradox. This study also illustrates the advantages of ensemble simulations over single simulations in understanding oceanic fluctuations and attributing them to external drivers, while also cautioning against overreliance on individual simulations assessments. |
format |
Article in Journal/Newspaper |
author |
Narinc, Olivier Penduff, Thierry Maze, Guillaume Leroux, Stéphanie Molines, Jean-Marc |
author_facet |
Narinc, Olivier Penduff, Thierry Maze, Guillaume Leroux, Stéphanie Molines, Jean-Marc |
author_sort |
Narinc, Olivier |
title |
North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
title_short |
North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
title_full |
North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
title_fullStr |
North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
title_full_unstemmed |
North Atlantic Subtropical Mode Water properties: Intrinsic and atmospherically-forced interannual variability |
title_sort |
north atlantic subtropical mode water properties: intrinsic and atmospherically-forced interannual variability |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-1146 https://noa.gwlb.de/receive/cop_mods_00073200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071381/egusphere-2024-1146.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1146/egusphere-2024-1146.pdf |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_relation |
https://doi.org/10.5194/egusphere-2024-1146 https://noa.gwlb.de/receive/cop_mods_00073200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071381/egusphere-2024-1146.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1146/egusphere-2024-1146.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2024-1146 |
_version_ |
1799484684870090752 |