Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales
International audience Satellite altimetry data have revealed a global mean sea level rise of 3.1 mm/yr since 1993 with large regional sea level trend variability. These remote data highlight complex structures especially in strongly eddying regions. A recent study showed that over 38% of the global...
Main Authors: | , , , |
---|---|
Other Authors: | , , |
Format: | Conference Object |
Language: | English |
Published: |
HAL CCSD
2021
|
Subjects: | |
Online Access: | https://hal.science/hal-04549977 https://doi.org/10.5194/egusphere-egu21-1297 |
id |
ftinsu:oai:HAL:hal-04549977v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-04549977v1 2024-10-06T13:52:44+00:00 Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales Carret, Alice Llovel, William Penduff, Thierry Molines, Jean-Marc Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP) Université Grenoble Alpes (UGA) Online/Vienna, Austria 2021-04 https://hal.science/hal-04549977 https://doi.org/10.5194/egusphere-egu21-1297 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-1297 EGU General Assembly https://hal.science/hal-04549977 EGU General Assembly, Apr 2021, Online/Vienna, Austria. ⟨10.5194/egusphere-egu21-1297⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/conferenceObject Conference papers 2021 ftinsu https://doi.org/10.5194/egusphere-egu21-1297 2024-09-26T15:02:33Z International audience Satellite altimetry data have revealed a global mean sea level rise of 3.1 mm/yr since 1993 with large regional sea level trend variability. These remote data highlight complex structures especially in strongly eddying regions. A recent study showed that over 38% of the global ocean area, the chaotic variability that spontaneously emerges from the ocean may hinder the attribution to the atmospheric forcing of regional sea level trends from 1993 to 2015. This study aims at complementing this work by first focusing on the atmospherically-forced and chaotic contributions of regional sea level interannual variability and its components (steric and manometric sea level interannual variability). A global ¼° ocean/sea-ice 50-member ensemble simulation is considered to disentangle the imprints of the atmospheric forcing and of the chaotic ocean variability over 1993-2015. The atmospherically-forced and chaotic interannual variabilities of sea level mainly have a steric origin , except in coastal areas. The chaotic part of the interannual variability of sea level and its components is stronger in the Pacific and Atlantic oceans than in the Indian ocean. The chaotic part of the interannual variability of sea level and of its steric component exceeds 20% over 48% of the global ocean area; this fractional area reduces to 26% for the manometric component. As the chaotic part of the regional sea level interannual variability has a substantial imprint, this study then interested in quantifying the periods when it becomes dominant over the atmospherically-forced contribution. This is assessed using spectral analysis on the ensemble simulation in the frequency domain for the sea level and its steric and manometric components over the global ocean as well as in some basins of interest. This enables us to better characterise and quantify the chaotic ocean variability contribution to regional sea level changes and its components. Conference Object Sea ice Institut national des sciences de l'Univers: HAL-INSU Indian Pacific |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Carret, Alice Llovel, William Penduff, Thierry Molines, Jean-Marc Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Satellite altimetry data have revealed a global mean sea level rise of 3.1 mm/yr since 1993 with large regional sea level trend variability. These remote data highlight complex structures especially in strongly eddying regions. A recent study showed that over 38% of the global ocean area, the chaotic variability that spontaneously emerges from the ocean may hinder the attribution to the atmospheric forcing of regional sea level trends from 1993 to 2015. This study aims at complementing this work by first focusing on the atmospherically-forced and chaotic contributions of regional sea level interannual variability and its components (steric and manometric sea level interannual variability). A global ¼° ocean/sea-ice 50-member ensemble simulation is considered to disentangle the imprints of the atmospheric forcing and of the chaotic ocean variability over 1993-2015. The atmospherically-forced and chaotic interannual variabilities of sea level mainly have a steric origin , except in coastal areas. The chaotic part of the interannual variability of sea level and its components is stronger in the Pacific and Atlantic oceans than in the Indian ocean. The chaotic part of the interannual variability of sea level and of its steric component exceeds 20% over 48% of the global ocean area; this fractional area reduces to 26% for the manometric component. As the chaotic part of the regional sea level interannual variability has a substantial imprint, this study then interested in quantifying the periods when it becomes dominant over the atmospherically-forced contribution. This is assessed using spectral analysis on the ensemble simulation in the frequency domain for the sea level and its steric and manometric components over the global ocean as well as in some basins of interest. This enables us to better characterise and quantify the chaotic ocean variability contribution to regional sea level changes and its components. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP) Université Grenoble Alpes (UGA) |
format |
Conference Object |
author |
Carret, Alice Llovel, William Penduff, Thierry Molines, Jean-Marc |
author_facet |
Carret, Alice Llovel, William Penduff, Thierry Molines, Jean-Marc |
author_sort |
Carret, Alice |
title |
Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
title_short |
Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
title_full |
Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
title_fullStr |
Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
title_full_unstemmed |
Characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
title_sort |
characterisation of the chaotic variability of the regional sea level and its components over 1993-2015 at interannual time scales |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-04549977 https://doi.org/10.5194/egusphere-egu21-1297 |
op_coverage |
Online/Vienna, Austria |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
EGU General Assembly https://hal.science/hal-04549977 EGU General Assembly, Apr 2021, Online/Vienna, Austria. ⟨10.5194/egusphere-egu21-1297⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-1297 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-1297 |
_version_ |
1812181209145409536 |