SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009)
International audience Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999–2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://hal.archives-ouvertes.fr/hal-01150524 https://doi.org/10.1002/jgrc.20287 |
id |
ftccsdartic:oai:HAL:hal-01150524v1 |
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openpolar |
institution |
Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Goubanova, Katerina Illig, Séréna Machu, Eric Garçon, Véronique Dewitte, Boris SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
topic_facet |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999–2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Functions (EOF) decomposition and wavelet analysis. Despite the land contamination of the TMI satellite data within approximately 100 km off the coast the first EOF of SST anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. Two regimes of variability are evidenced: a submonthly (2–30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30–90 days) regime with a dominant 61 days oscillation. Both regimes are modulated, to a large extent, by the local surface wind stress and are consistent with Ekman dynamics. The seasonality of the relationship between wind stress and SST for submonthly (intraseasonal) regime is characterized by a marked semiannual (annual) cycle, which is explained in terms of the impact of seasonal change of the upper ocean stratification on the vertical advection process. The wind-driven SST subseasonal variability is shown to be associated with eastward propagating disturbances in the midlatitudes corresponding to a wave number 4. The results also suggest an important role of the Antarctic Oscillation in modulating the intraseasonal wind-driven SST variability. The characteristics of the equatorial intraseasonal Kelvin waves are documented in order to discuss possible impact of remote oceanic forcing on SST variability along the coast in the Benguela upwelling system. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Goubanova, Katerina Illig, Séréna Machu, Eric Garçon, Véronique Dewitte, Boris |
author_facet |
Goubanova, Katerina Illig, Séréna Machu, Eric Garçon, Véronique Dewitte, Boris |
author_sort |
Goubanova, Katerina |
title |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
title_short |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
title_full |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
title_fullStr |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
title_full_unstemmed |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) |
title_sort |
sst subseasonal variability in the central benguela upwelling system as inferred from satellite observations (1999–2009) |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-01150524 https://doi.org/10.1002/jgrc.20287 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-01150524 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2013, 119 (9), pp.4092-4110. ⟨10.1002/jgrc.20287⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/jgrc.20287 hal-01150524 https://hal.archives-ouvertes.fr/hal-01150524 doi:10.1002/jgrc.20287 |
op_doi |
https://doi.org/10.1002/jgrc.20287 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
9 |
container_start_page |
4092 |
op_container_end_page |
4110 |
_version_ |
1766274025031467008 |
spelling |
ftccsdartic:oai:HAL:hal-01150524v1 2023-05-15T14:03:23+02:00 SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999–2009) Goubanova, Katerina Illig, Séréna Machu, Eric Garçon, Véronique Dewitte, Boris Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2013-09 https://hal.archives-ouvertes.fr/hal-01150524 https://doi.org/10.1002/jgrc.20287 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/jgrc.20287 hal-01150524 https://hal.archives-ouvertes.fr/hal-01150524 doi:10.1002/jgrc.20287 ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-01150524 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2013, 119 (9), pp.4092-4110. ⟨10.1002/jgrc.20287⟩ Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1002/jgrc.20287 2021-11-28T01:15:45Z International audience Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999–2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Functions (EOF) decomposition and wavelet analysis. Despite the land contamination of the TMI satellite data within approximately 100 km off the coast the first EOF of SST anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. Two regimes of variability are evidenced: a submonthly (2–30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30–90 days) regime with a dominant 61 days oscillation. Both regimes are modulated, to a large extent, by the local surface wind stress and are consistent with Ekman dynamics. The seasonality of the relationship between wind stress and SST for submonthly (intraseasonal) regime is characterized by a marked semiannual (annual) cycle, which is explained in terms of the impact of seasonal change of the upper ocean stratification on the vertical advection process. The wind-driven SST subseasonal variability is shown to be associated with eastward propagating disturbances in the midlatitudes corresponding to a wave number 4. The results also suggest an important role of the Antarctic Oscillation in modulating the intraseasonal wind-driven SST variability. The characteristics of the equatorial intraseasonal Kelvin waves are documented in order to discuss possible impact of remote oceanic forcing on SST variability along the coast in the Benguela upwelling system. Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Journal of Geophysical Research: Oceans 118 9 4092 4110 |