New Perspectives on Frontal Variability in the Southern Ocean
International audience The frontal structure of the Southern Ocean is investigated using the Wavelet/Higher Order Statistics Enhancement (WHOSE) frontal detection method, introduced in Chapman’s work. This methodology is applied to 21 yr of daily gridded absolute dynamic topography (ADT) data to obt...
Published in: | Journal of Physical Oceanography |
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Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Online Access: | https://hal.science/hal-01685255 https://hal.science/hal-01685255/document https://hal.science/hal-01685255/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20New%20Perspectives%20on%20Frontal%20Variability%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JPO-D-16-0222.1 |
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ftuniparissaclay:oai:HAL:hal-01685255v1 |
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Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
Southern Ocean Fronts Satellite observations Pattern detection Climate variability Trends [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Southern Ocean Fronts Satellite observations Pattern detection Climate variability Trends [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Chapman, Christopher New Perspectives on Frontal Variability in the Southern Ocean |
topic_facet |
Southern Ocean Fronts Satellite observations Pattern detection Climate variability Trends [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience The frontal structure of the Southern Ocean is investigated using the Wavelet/Higher Order Statistics Enhancement (WHOSE) frontal detection method, introduced in Chapman’s work. This methodology is applied to 21 yr of daily gridded absolute dynamic topography (ADT) data to obtain daily maps of the locations of the fronts. By forming frontal occurrence frequency maps and then approximating these occurrence maps by a superposition of simple functions, the time-mean locations of the fronts, as well as a measure of their capacity to meander, are obtained and related to the frontal locations found by previous studies. The spatial and temporal variability of the frontal structure is then considered. The number of fronts is found to be highly variable throughout the Southern Ocean, increasing (splitting) downstream of large bathymetric features and decreasing (merging) in regions where the fronts are tightly controlled by the underlying topography. These splitting/merging events are related to changes in the underlying frontal structure whereby regions of high frontal occurrence cross or spread over streamfunction contours. In contrast to the number of fronts, frontal meandering remains relatively constant throughout the Southern Ocean. Little to no migration of the fronts over the 1993–2014 time period is found, and there is only weak sensitivity of frontal positions to atmospheric forcing related to the southern annular mode or the El Niño–Southern Oscillation. Finally, the implications of these results for the study of cross-stream tracer transport are discussed. |
author2 |
Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) National Science Foundation Division of Ocean Sciences Postdoctoral Fellowship 1521508 |
format |
Article in Journal/Newspaper |
author |
Chapman, Christopher |
author_facet |
Chapman, Christopher |
author_sort |
Chapman, Christopher |
title |
New Perspectives on Frontal Variability in the Southern Ocean |
title_short |
New Perspectives on Frontal Variability in the Southern Ocean |
title_full |
New Perspectives on Frontal Variability in the Southern Ocean |
title_fullStr |
New Perspectives on Frontal Variability in the Southern Ocean |
title_full_unstemmed |
New Perspectives on Frontal Variability in the Southern Ocean |
title_sort |
new perspectives on frontal variability in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01685255 https://hal.science/hal-01685255/document https://hal.science/hal-01685255/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20New%20Perspectives%20on%20Frontal%20Variability%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JPO-D-16-0222.1 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01685255 Journal of Physical Oceanography, 2017, 47 (5), pp.1151 - 1168. ⟨10.1175/JPO-D-16-0222.1⟩ http://journals.ametsoc.org/doi/10.1175/JPO-D-16-0222.1 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-16-0222.1 hal-01685255 https://hal.science/hal-01685255 https://hal.science/hal-01685255/document https://hal.science/hal-01685255/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20New%20Perspectives%20on%20Frontal%20Variability%20in%20the%20Southern%20Ocean.pdf doi:10.1175/JPO-D-16-0222.1 WOS: 000401462000012 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-16-0222.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
5 |
container_start_page |
1151 |
op_container_end_page |
1168 |
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1810480946939428864 |
spelling |
ftuniparissaclay:oai:HAL:hal-01685255v1 2024-09-15T18:37:00+00:00 New Perspectives on Frontal Variability in the Southern Ocean Chapman, Christopher Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) National Science Foundation Division of Ocean Sciences Postdoctoral Fellowship 1521508 2017-05 https://hal.science/hal-01685255 https://hal.science/hal-01685255/document https://hal.science/hal-01685255/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20New%20Perspectives%20on%20Frontal%20Variability%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JPO-D-16-0222.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-16-0222.1 hal-01685255 https://hal.science/hal-01685255 https://hal.science/hal-01685255/document https://hal.science/hal-01685255/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20New%20Perspectives%20on%20Frontal%20Variability%20in%20the%20Southern%20Ocean.pdf doi:10.1175/JPO-D-16-0222.1 WOS: 000401462000012 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01685255 Journal of Physical Oceanography, 2017, 47 (5), pp.1151 - 1168. ⟨10.1175/JPO-D-16-0222.1⟩ http://journals.ametsoc.org/doi/10.1175/JPO-D-16-0222.1 Southern Ocean Fronts Satellite observations Pattern detection Climate variability Trends [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2017 ftuniparissaclay https://doi.org/10.1175/JPO-D-16-0222.1 2024-08-01T23:49:21Z International audience The frontal structure of the Southern Ocean is investigated using the Wavelet/Higher Order Statistics Enhancement (WHOSE) frontal detection method, introduced in Chapman’s work. This methodology is applied to 21 yr of daily gridded absolute dynamic topography (ADT) data to obtain daily maps of the locations of the fronts. By forming frontal occurrence frequency maps and then approximating these occurrence maps by a superposition of simple functions, the time-mean locations of the fronts, as well as a measure of their capacity to meander, are obtained and related to the frontal locations found by previous studies. The spatial and temporal variability of the frontal structure is then considered. The number of fronts is found to be highly variable throughout the Southern Ocean, increasing (splitting) downstream of large bathymetric features and decreasing (merging) in regions where the fronts are tightly controlled by the underlying topography. These splitting/merging events are related to changes in the underlying frontal structure whereby regions of high frontal occurrence cross or spread over streamfunction contours. In contrast to the number of fronts, frontal meandering remains relatively constant throughout the Southern Ocean. Little to no migration of the fronts over the 1993–2014 time period is found, and there is only weak sensitivity of frontal positions to atmospheric forcing related to the southern annular mode or the El Niño–Southern Oscillation. Finally, the implications of these results for the study of cross-stream tracer transport are discussed. Article in Journal/Newspaper Southern Ocean Archives ouvertes de Paris-Saclay Journal of Physical Oceanography 47 5 1151 1168 |