Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations
A new Objective Algorithm for the Characterization of the permanent Pycnocline (OACP) in subtropical gyres is proposed. OAC-P is based on a pragmatic analysis of vertical density gradient features to identify the permanent pycnocline: OAC-P identifies the permanent pycnocline as the stratified layer...
Published in: | Journal of Atmospheric and Oceanic Technology |
---|---|
Main Authors: | , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2016
|
Subjects: | |
Online Access: | https://hal.science/hal-04200817 https://hal.science/hal-04200817/document https://hal.science/hal-04200817/file/atot-jtech-d-15-0192_1.pdf https://doi.org/10.1175/JTECH-D-15-0192.1 |
id |
ftccsdartic:oai:HAL:hal-04200817v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-04200817v1 2023-12-17T10:46:17+01:00 Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations Feucher, Charlene Maze, Guillaume Mercier, Herle Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-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) 2016-06 https://hal.science/hal-04200817 https://hal.science/hal-04200817/document https://hal.science/hal-04200817/file/atot-jtech-d-15-0192_1.pdf https://doi.org/10.1175/JTECH-D-15-0192.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JTECH-D-15-0192.1 hal-04200817 https://hal.science/hal-04200817 https://hal.science/hal-04200817/document https://hal.science/hal-04200817/file/atot-jtech-d-15-0192_1.pdf doi:10.1175/JTECH-D-15-0192.1 info:eu-repo/semantics/OpenAccess ISSN: 0739-0572 EISSN: 1520-0426 Journal of Atmospheric and Oceanic Technology https://hal.science/hal-04200817 Journal of Atmospheric and Oceanic Technology, 2016, 33 (6), pp.1285-1308. ⟨10.1175/JTECH-D-15-0192.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1175/JTECH-D-15-0192.1 2023-11-18T23:42:50Z A new Objective Algorithm for the Characterization of the permanent Pycnocline (OACP) in subtropical gyres is proposed. OAC-P is based on a pragmatic analysis of vertical density gradient features to identify the permanent pycnocline: OAC-P identifies the permanent pycnocline as the stratified layer found below surface mode waters. OAC-P provides the permanent pycnocline depth, unequivocally associated with a local maximum in the stratification, and top and bottom thicknesses, associated with upward and downward decreases in stratification. OAC-P uses half Gaussian curves as asymmetric non-linear analytical models of the stratification peak. It is the first time that an algorithm is proposed to characterize objectively the permanent pycnocline for a region where handling the stronger stratification peak of the seasonal pycnocline is complex. A guideline for how-to implement OAC-P is given, with application to the North Atlantic Ocean Argo data as example. OAC-P provides a detailed description of the mean structure of the North Atlantic subtropical permanent pycnocline. OAC-P detects a permanent pycnocline throughout the subtropical gyre north of the North Equatorial Current. The large scale description of the permanent pycnocline depth structure as a classic bowl shape is captured however with much more details. New regional information is provided. In particular: (i) there is only one region - the southern recirculation gyre of the Gulf Stream Extension - where the permanent pycnocline is along an isopycnal surface and (ii) vertical asymmetries clearly discriminate one region from another. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Atmospheric and Oceanic Technology 33 6 1285 1308 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Feucher, Charlene Maze, Guillaume Mercier, Herle Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
A new Objective Algorithm for the Characterization of the permanent Pycnocline (OACP) in subtropical gyres is proposed. OAC-P is based on a pragmatic analysis of vertical density gradient features to identify the permanent pycnocline: OAC-P identifies the permanent pycnocline as the stratified layer found below surface mode waters. OAC-P provides the permanent pycnocline depth, unequivocally associated with a local maximum in the stratification, and top and bottom thicknesses, associated with upward and downward decreases in stratification. OAC-P uses half Gaussian curves as asymmetric non-linear analytical models of the stratification peak. It is the first time that an algorithm is proposed to characterize objectively the permanent pycnocline for a region where handling the stronger stratification peak of the seasonal pycnocline is complex. A guideline for how-to implement OAC-P is given, with application to the North Atlantic Ocean Argo data as example. OAC-P provides a detailed description of the mean structure of the North Atlantic subtropical permanent pycnocline. OAC-P detects a permanent pycnocline throughout the subtropical gyre north of the North Equatorial Current. The large scale description of the permanent pycnocline depth structure as a classic bowl shape is captured however with much more details. New regional information is provided. In particular: (i) there is only one region - the southern recirculation gyre of the Gulf Stream Extension - where the permanent pycnocline is along an isopycnal surface and (ii) vertical asymmetries clearly discriminate one region from another. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-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 |
Feucher, Charlene Maze, Guillaume Mercier, Herle |
author_facet |
Feucher, Charlene Maze, Guillaume Mercier, Herle |
author_sort |
Feucher, Charlene |
title |
Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
title_short |
Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
title_full |
Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
title_fullStr |
Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
title_full_unstemmed |
Mean structure of the North Atlantic subtropical permanent pycnocline from in-situ observations |
title_sort |
mean structure of the north atlantic subtropical permanent pycnocline from in-situ observations |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-04200817 https://hal.science/hal-04200817/document https://hal.science/hal-04200817/file/atot-jtech-d-15-0192_1.pdf https://doi.org/10.1175/JTECH-D-15-0192.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0739-0572 EISSN: 1520-0426 Journal of Atmospheric and Oceanic Technology https://hal.science/hal-04200817 Journal of Atmospheric and Oceanic Technology, 2016, 33 (6), pp.1285-1308. ⟨10.1175/JTECH-D-15-0192.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JTECH-D-15-0192.1 hal-04200817 https://hal.science/hal-04200817 https://hal.science/hal-04200817/document https://hal.science/hal-04200817/file/atot-jtech-d-15-0192_1.pdf doi:10.1175/JTECH-D-15-0192.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JTECH-D-15-0192.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
33 |
container_issue |
6 |
container_start_page |
1285 |
op_container_end_page |
1308 |
_version_ |
1785569692941811712 |