Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis
ABSTRACT Decadal-scale changes in the meridional circulation of the Southern Ocean south of Australia are studied, over the period 1958-2005, using Simple Ocean Data Assimilation (SODA) reanalysis data. Upper Circumpolar Deep Water (UCDW) is found to upwell nearer to the surface over time, while the...
Published in: | Tellus A: Dynamic Meteorology and Oceanography |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell Publishing
2010
|
Subjects: | |
Online Access: | http://hdl.handle.net/10072/36127 https://doi.org/10.1111/j.1600-0870.2010.00462.x |
id |
ftgriffithuniv:oai:research-repository.griffith.edu.au:10072/36127 |
---|---|
record_format |
openpolar |
spelling |
ftgriffithuniv:oai:research-repository.griffith.edu.au:10072/36127 2023-05-15T18:25:04+02:00 Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis Johnston, Barbara Gabric, Albert 2010 application/pdf http://hdl.handle.net/10072/36127 https://doi.org/10.1111/j.1600-0870.2010.00462.x English en_AU eng Wiley-Blackwell Publishing Tellus Series A: Dynamic Meteorology and Oceanography © 2010 the Authors and Blackwell Munksgaard. This is the author-manuscript version of the paper. Reproduced in accordance with the copyright policy of the publisher.The definitive version is available at www.interscience.wiley.com Physical Oceanography Journal article 2010 ftgriffithuniv https://doi.org/10.1111/j.1600-0870.2010.00462.x 2018-07-30T10:18:26Z ABSTRACT Decadal-scale changes in the meridional circulation of the Southern Ocean south of Australia are studied, over the period 1958-2005, using Simple Ocean Data Assimilation (SODA) reanalysis data. Upper Circumpolar Deep Water (UCDW) is found to upwell nearer to the surface over time, while the mixed layer (ML) is found to deepen, leading to an increase in the number of times that UCDW intrudes into the ML. This entrainment of nutrients, especially iron, into the ML from UCDW, is crucial for primary production and appears to occur predominantly in summer/autumn, contrary to previous reports. ML temperature, density and salinity all show increasing trends in almost all seasons and latitudinal zones within the study region. A notable exception to the general increase in temperature occurs in the most southerly zone 60-65Ӡin summer. An explanation for this apparent anomaly could be related to increased winds (in conjunction with the increasing trend in the Southern Annular Mode), which mix remnant winter water into the ML, negating the surface temperature increase. Unlike trends in ML variables, trends in UCDW variables appear to be decoupled from the surface trends and occur on time-scales that may be centennial rather than decadal. Griffith Sciences, School of Natural Sciences Full Text Article in Journal/Newspaper Southern Ocean Griffith University: Griffith Research Online Southern Ocean Griffith ENVELOPE(-155.500,-155.500,-85.883,-85.883) Tellus A: Dynamic Meteorology and Oceanography 62 5 719 736 |
institution |
Open Polar |
collection |
Griffith University: Griffith Research Online |
op_collection_id |
ftgriffithuniv |
language |
English |
topic |
Physical Oceanography |
spellingShingle |
Physical Oceanography Johnston, Barbara Gabric, Albert Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
topic_facet |
Physical Oceanography |
description |
ABSTRACT Decadal-scale changes in the meridional circulation of the Southern Ocean south of Australia are studied, over the period 1958-2005, using Simple Ocean Data Assimilation (SODA) reanalysis data. Upper Circumpolar Deep Water (UCDW) is found to upwell nearer to the surface over time, while the mixed layer (ML) is found to deepen, leading to an increase in the number of times that UCDW intrudes into the ML. This entrainment of nutrients, especially iron, into the ML from UCDW, is crucial for primary production and appears to occur predominantly in summer/autumn, contrary to previous reports. ML temperature, density and salinity all show increasing trends in almost all seasons and latitudinal zones within the study region. A notable exception to the general increase in temperature occurs in the most southerly zone 60-65Ӡin summer. An explanation for this apparent anomaly could be related to increased winds (in conjunction with the increasing trend in the Southern Annular Mode), which mix remnant winter water into the ML, negating the surface temperature increase. Unlike trends in ML variables, trends in UCDW variables appear to be decoupled from the surface trends and occur on time-scales that may be centennial rather than decadal. Griffith Sciences, School of Natural Sciences Full Text |
format |
Article in Journal/Newspaper |
author |
Johnston, Barbara Gabric, Albert |
author_facet |
Johnston, Barbara Gabric, Albert |
author_sort |
Johnston, Barbara |
title |
Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
title_short |
Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
title_full |
Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
title_fullStr |
Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
title_full_unstemmed |
Long-term trends in upper ocean structure and meridional circulation of the Southern Ocean south of Australia derived from the SODA reanalysis |
title_sort |
long-term trends in upper ocean structure and meridional circulation of the southern ocean south of australia derived from the soda reanalysis |
publisher |
Wiley-Blackwell Publishing |
publishDate |
2010 |
url |
http://hdl.handle.net/10072/36127 https://doi.org/10.1111/j.1600-0870.2010.00462.x |
long_lat |
ENVELOPE(-155.500,-155.500,-85.883,-85.883) |
geographic |
Southern Ocean Griffith |
geographic_facet |
Southern Ocean Griffith |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Tellus Series A: Dynamic Meteorology and Oceanography |
op_rights |
© 2010 the Authors and Blackwell Munksgaard. This is the author-manuscript version of the paper. Reproduced in accordance with the copyright policy of the publisher.The definitive version is available at www.interscience.wiley.com |
op_doi |
https://doi.org/10.1111/j.1600-0870.2010.00462.x |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
62 |
container_issue |
5 |
container_start_page |
719 |
op_container_end_page |
736 |
_version_ |
1766206251411177472 |