Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009
International audience At seasonal and shorter periods the solid Earth and its overlying geophysical fluids form a closed dynamical system, which (except for tidal forcing) conserves its total angular momentum. While atmospheric effects dominate changes in the Earth's rate of rotation and hence...
Published in: | Geophysical Research Letters |
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Language: | English |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374/document https://hal-insu.archives-ouvertes.fr/insu-03583374/file/Geophysical%20Research%20Letters%20-%202012%20-%20Marcus%20-%20Detection%20of%20the%20Earth%20rotation%20response%20to%20a%20rapid%20fluctuation%20of%20Southern.pdf https://doi.org/10.1029/2011GL050671 |
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ftinsu:oai:HAL:insu-03583374v1 2023-06-18T03:37:30+02:00 Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 Marcus, S. L. Dickey, J. O. Fukumori, I. de Viron, O. Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal-insu.archives-ouvertes.fr/insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374/document https://hal-insu.archives-ouvertes.fr/insu-03583374/file/Geophysical%20Research%20Letters%20-%202012%20-%20Marcus%20-%20Detection%20of%20the%20Earth%20rotation%20response%20to%20a%20rapid%20fluctuation%20of%20Southern.pdf https://doi.org/10.1029/2011GL050671 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2011GL050671 insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374/document https://hal-insu.archives-ouvertes.fr/insu-03583374/file/Geophysical%20Research%20Letters%20-%202012%20-%20Marcus%20-%20Detection%20of%20the%20Earth%20rotation%20response%20to%20a%20rapid%20fluctuation%20of%20Southern.pdf BIBCODE: 2012GeoRL.39.4605M doi:10.1029/2011GL050671 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03583374 Geophysical Research Letters, 2012, 39, pp. 133-137. ⟨10.1029/2011GL050671⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1029/2011GL050671 2023-06-05T20:51:38Z International audience At seasonal and shorter periods the solid Earth and its overlying geophysical fluids form a closed dynamical system, which (except for tidal forcing) conserves its total angular momentum. While atmospheric effects dominate changes in the Earth's rate of rotation and hence length-of-day (LOD) on these time scales, the addition of oceanic angular momentum (OAM) estimates has been shown to improve closure of the LOD budget in a statistical sense. Here we demonstrate, for the first time, the signature of a specific, sub-monthly ocean current fluctuation on the Earth's rotation rate, coinciding with recently-reported anomalies which developed in southeast Pacific surface temperature and bottom pressure fields during late 2009. Our results show that concurrent variations in the Antarctic Circumpolar Current (ACC), which saw a sharp drop and recovery in zonal transport during a two-week period in November, were strong enough to cause a detectable change in LOD following the removal of atmospheric angular momentum (AAM) computed from the Modern Era Retrospective Analysis for Research and Applications (MERRA) database. The strong OAM variations driving the LOD-AAM changes were diagnosed from ocean state estimates of the Consortium for Estimating the Circulation and Climate of the Ocean (ECCO) and involved roughly equal contributions from the current and pressure terms, with in situ confirmation for the latter provided by tide-corrected bottom pressure recorder data from the South Drake Passage site of the Antarctic Circumpolar Current Levels by Altimetry and Island Measurements (ACCLAIM) network. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Drake Passage Merra ENVELOPE(12.615,12.615,65.816,65.816) Pacific Southern Ocean The Antarctic Geophysical Research Letters 39 4 n/a n/a |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Marcus, S. L. Dickey, J. O. Fukumori, I. de Viron, O. Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience At seasonal and shorter periods the solid Earth and its overlying geophysical fluids form a closed dynamical system, which (except for tidal forcing) conserves its total angular momentum. While atmospheric effects dominate changes in the Earth's rate of rotation and hence length-of-day (LOD) on these time scales, the addition of oceanic angular momentum (OAM) estimates has been shown to improve closure of the LOD budget in a statistical sense. Here we demonstrate, for the first time, the signature of a specific, sub-monthly ocean current fluctuation on the Earth's rotation rate, coinciding with recently-reported anomalies which developed in southeast Pacific surface temperature and bottom pressure fields during late 2009. Our results show that concurrent variations in the Antarctic Circumpolar Current (ACC), which saw a sharp drop and recovery in zonal transport during a two-week period in November, were strong enough to cause a detectable change in LOD following the removal of atmospheric angular momentum (AAM) computed from the Modern Era Retrospective Analysis for Research and Applications (MERRA) database. The strong OAM variations driving the LOD-AAM changes were diagnosed from ocean state estimates of the Consortium for Estimating the Circulation and Climate of the Ocean (ECCO) and involved roughly equal contributions from the current and pressure terms, with in situ confirmation for the latter provided by tide-corrected bottom pressure recorder data from the South Drake Passage site of the Antarctic Circumpolar Current Levels by Altimetry and Island Measurements (ACCLAIM) network. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Marcus, S. L. Dickey, J. O. Fukumori, I. de Viron, O. |
author_facet |
Marcus, S. L. Dickey, J. O. Fukumori, I. de Viron, O. |
author_sort |
Marcus, S. L. |
title |
Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
title_short |
Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
title_full |
Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
title_fullStr |
Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
title_full_unstemmed |
Detection of the Earth rotation response to a rapid fluctuation of Southern Ocean circulation in November 2009 |
title_sort |
detection of the earth rotation response to a rapid fluctuation of southern ocean circulation in november 2009 |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374/document https://hal-insu.archives-ouvertes.fr/insu-03583374/file/Geophysical%20Research%20Letters%20-%202012%20-%20Marcus%20-%20Detection%20of%20the%20Earth%20rotation%20response%20to%20a%20rapid%20fluctuation%20of%20Southern.pdf https://doi.org/10.1029/2011GL050671 |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Antarctic Drake Passage Merra Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Merra Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03583374 Geophysical Research Letters, 2012, 39, pp. 133-137. ⟨10.1029/2011GL050671⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2011GL050671 insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374 https://hal-insu.archives-ouvertes.fr/insu-03583374/document https://hal-insu.archives-ouvertes.fr/insu-03583374/file/Geophysical%20Research%20Letters%20-%202012%20-%20Marcus%20-%20Detection%20of%20the%20Earth%20rotation%20response%20to%20a%20rapid%20fluctuation%20of%20Southern.pdf BIBCODE: 2012GeoRL.39.4605M doi:10.1029/2011GL050671 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2011GL050671 |
container_title |
Geophysical Research Letters |
container_volume |
39 |
container_issue |
4 |
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1769010302415798272 |