Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses

An empirical method to reconstruct distributions of mixing water masses is developed and applied to two Southern Ocean ( Australian sector) data sets. The method is a parametric extension of the well-known Optimum Multiparameter (OMP) analysis, therefore called POMP ( parametric OMP). The main devel...

Full description

Bibliographic Details
Published in:Journal of Geophysical Research
Main Authors: Debrauwere, Anouk, Jacquet, Stéphanie H. M., De Ridder, Fjo, Dehairs, Frank, Pintelon, Rik, Baeyens, Willy
Other Authors: UCL - Autre
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2007
Subjects:
Online Access:http://hdl.handle.net/2078/120279
https://doi.org/10.1029/2006JC003742
id ftunivlouvain:oai:dial.uclouvain.be:boreal:120279
record_format openpolar
spelling ftunivlouvain:oai:dial.uclouvain.be:boreal:120279 2024-05-19T07:48:51+00:00 Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses Debrauwere, Anouk Jacquet, Stéphanie H. M. De Ridder, Fjo Dehairs, Frank Pintelon, Rik Baeyens, Willy UCL - Autre 2007 http://hdl.handle.net/2078/120279 https://doi.org/10.1029/2006JC003742 eng eng American Geophysical Union boreal:120279 http://hdl.handle.net/2078/120279 doi:10.1029/2006JC003742 urn:ISSN:0148-0227 urn:EISSN:2156-2202 Journal of Geophysical Research, Vol. 112, no.C2 (2007) info:eu-repo/semantics/article 2007 ftunivlouvain https://doi.org/10.1029/2006JC003742 2024-04-24T01:40:09Z An empirical method to reconstruct distributions of mixing water masses is developed and applied to two Southern Ocean ( Australian sector) data sets. The method is a parametric extension of the well-known Optimum Multiparameter (OMP) analysis, therefore called POMP ( parametric OMP). The main development consists of parameterizing the mixing fractions as a function of position ( e. g. latitude and depth) and estimating the parameters of the resulting function, instead of estimating the mixing fractions for every sampling point individually. Because this enables to reduce the total number of unknowns to be estimated, the proposed adjustments result in more robust estimates of the mixing fractions, as illustrated on the Southern Ocean CLIVAR-SR3 data set ( early spring 2001). An additional consequence of the new working scheme is that the mixing distributions are smoothed. It is emphasized that the degree of smoothing should be chosen with care in order not to neglect any significant features. Statistical rules to do this are applied. Application of the POMP method to the second Southern Ocean data set (SAZ' 98, summer 1998) revealed the importance of a careful selection of the mixing source water types. This study was limited to the subantarctic region and upper 1000 m, where variations in water mass characteristics and distributions are most important. Indeed, it seems necessary to redefine the source water characteristics for each data set. The direction of these changes suggests that interannual variability or long term changes of water masses overwhelm the seasonal variability. Article in Journal/Newspaper Southern Ocean DIAL@UCLouvain (Université catholique de Louvain) Journal of Geophysical Research 112 C2
institution Open Polar
collection DIAL@UCLouvain (Université catholique de Louvain)
op_collection_id ftunivlouvain
language English
description An empirical method to reconstruct distributions of mixing water masses is developed and applied to two Southern Ocean ( Australian sector) data sets. The method is a parametric extension of the well-known Optimum Multiparameter (OMP) analysis, therefore called POMP ( parametric OMP). The main development consists of parameterizing the mixing fractions as a function of position ( e. g. latitude and depth) and estimating the parameters of the resulting function, instead of estimating the mixing fractions for every sampling point individually. Because this enables to reduce the total number of unknowns to be estimated, the proposed adjustments result in more robust estimates of the mixing fractions, as illustrated on the Southern Ocean CLIVAR-SR3 data set ( early spring 2001). An additional consequence of the new working scheme is that the mixing distributions are smoothed. It is emphasized that the degree of smoothing should be chosen with care in order not to neglect any significant features. Statistical rules to do this are applied. Application of the POMP method to the second Southern Ocean data set (SAZ' 98, summer 1998) revealed the importance of a careful selection of the mixing source water types. This study was limited to the subantarctic region and upper 1000 m, where variations in water mass characteristics and distributions are most important. Indeed, it seems necessary to redefine the source water characteristics for each data set. The direction of these changes suggests that interannual variability or long term changes of water masses overwhelm the seasonal variability.
author2 UCL - Autre
format Article in Journal/Newspaper
author Debrauwere, Anouk
Jacquet, Stéphanie H. M.
De Ridder, Fjo
Dehairs, Frank
Pintelon, Rik
Baeyens, Willy
spellingShingle Debrauwere, Anouk
Jacquet, Stéphanie H. M.
De Ridder, Fjo
Dehairs, Frank
Pintelon, Rik
Baeyens, Willy
Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
author_facet Debrauwere, Anouk
Jacquet, Stéphanie H. M.
De Ridder, Fjo
Dehairs, Frank
Pintelon, Rik
Baeyens, Willy
author_sort Debrauwere, Anouk
title Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
title_short Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
title_full Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
title_fullStr Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
title_full_unstemmed Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses
title_sort water mass distributions in the southern ocean derived from a parametric analysis of mixing water masses
publisher American Geophysical Union
publishDate 2007
url http://hdl.handle.net/2078/120279
https://doi.org/10.1029/2006JC003742
genre Southern Ocean
genre_facet Southern Ocean
op_source Journal of Geophysical Research, Vol. 112, no.C2 (2007)
op_relation boreal:120279
http://hdl.handle.net/2078/120279
doi:10.1029/2006JC003742
urn:ISSN:0148-0227
urn:EISSN:2156-2202
op_doi https://doi.org/10.1029/2006JC003742
container_title Journal of Geophysical Research
container_volume 112
container_issue C2
_version_ 1799467212302450688