Eddy response to Southern Ocean climate modes
Interannual variations in Southern Ocean eddy kinetic energy (EKE) are investigated using 16 years of altimetric data. Circumpolar averages show a peak in EKE from 2000 to 2002, 2-3 years after the peak in the Southern Annular Mode (SAM) index. Although the SAM forcing is in phase around the circump...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
Amer Geophysical Union
2010
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2009JC005894 https://archimer.ifremer.fr/doc/00230/34157/33031.pdf https://archimer.ifremer.fr/doc/00230/34157/ |
id |
fttriple:oai:gotriple.eu:10670/1.v0s6st |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.v0s6st 2023-05-15T18:24:49+02:00 Eddy response to Southern Ocean climate modes Morrow, R. Ward, Marshall L. Hogg, Andrew Mcc. Pasquet, S. 2010-01-01 https://doi.org/10.1029/2009JC005894 https://archimer.ifremer.fr/doc/00230/34157/33031.pdf https://archimer.ifremer.fr/doc/00230/34157/ en eng Amer Geophysical Union doi:10.1029/2009JC005894 10670/1.v0s6st https://archimer.ifremer.fr/doc/00230/34157/33031.pdf https://archimer.ifremer.fr/doc/00230/34157/ Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2010-10 , Vol. 115 , N. C10030 , P. 1-12 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2010 fttriple https://doi.org/10.1029/2009JC005894 2023-01-22T17:02:05Z Interannual variations in Southern Ocean eddy kinetic energy (EKE) are investigated using 16 years of altimetric data. Circumpolar averages show a peak in EKE from 2000 to 2002, 2-3 years after the peak in the Southern Annular Mode (SAM) index. Although the SAM forcing is in phase around the circumpolar band, we find the EKE response varies regionally. The strongest EKE is in the Pacific, with energy peaks occurring progressively later toward the east. We suggest that this is due to the presence of two climate modes: SAM and ENSO. When strong positive SAM events coincide with La Nina periods, as in 1999, anomalous meridional wind forcing is enhanced in the South Pacific Ocean, contributing to the observed increase in EKE 2-3 years later. When positive SAM events coincide with El Nino periods, as in 1993, the climate modes are in opposition in the South Pacific, leading to a weak EKE response during the mid-1990s. Numerical modeling supports these observations. By applying different combinations of SAM and ENSO, we can reproduce both the elevated Pacific EKE response to SAM as well as an additional amplification/suppression of EKE during La Nina/El Nino. In general, we find that the EKE response depends on the interplay between wind forcing, topography, and mean flow and produces a strongly heterogeneous distribution in the Southern Ocean. Text Southern Ocean Unknown Pacific Southern Ocean Journal of Geophysical Research: Oceans 115 C10 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Morrow, R. Ward, Marshall L. Hogg, Andrew Mcc. Pasquet, S. Eddy response to Southern Ocean climate modes |
topic_facet |
envir geo |
description |
Interannual variations in Southern Ocean eddy kinetic energy (EKE) are investigated using 16 years of altimetric data. Circumpolar averages show a peak in EKE from 2000 to 2002, 2-3 years after the peak in the Southern Annular Mode (SAM) index. Although the SAM forcing is in phase around the circumpolar band, we find the EKE response varies regionally. The strongest EKE is in the Pacific, with energy peaks occurring progressively later toward the east. We suggest that this is due to the presence of two climate modes: SAM and ENSO. When strong positive SAM events coincide with La Nina periods, as in 1999, anomalous meridional wind forcing is enhanced in the South Pacific Ocean, contributing to the observed increase in EKE 2-3 years later. When positive SAM events coincide with El Nino periods, as in 1993, the climate modes are in opposition in the South Pacific, leading to a weak EKE response during the mid-1990s. Numerical modeling supports these observations. By applying different combinations of SAM and ENSO, we can reproduce both the elevated Pacific EKE response to SAM as well as an additional amplification/suppression of EKE during La Nina/El Nino. In general, we find that the EKE response depends on the interplay between wind forcing, topography, and mean flow and produces a strongly heterogeneous distribution in the Southern Ocean. |
format |
Text |
author |
Morrow, R. Ward, Marshall L. Hogg, Andrew Mcc. Pasquet, S. |
author_facet |
Morrow, R. Ward, Marshall L. Hogg, Andrew Mcc. Pasquet, S. |
author_sort |
Morrow, R. |
title |
Eddy response to Southern Ocean climate modes |
title_short |
Eddy response to Southern Ocean climate modes |
title_full |
Eddy response to Southern Ocean climate modes |
title_fullStr |
Eddy response to Southern Ocean climate modes |
title_full_unstemmed |
Eddy response to Southern Ocean climate modes |
title_sort |
eddy response to southern ocean climate modes |
publisher |
Amer Geophysical Union |
publishDate |
2010 |
url |
https://doi.org/10.1029/2009JC005894 https://archimer.ifremer.fr/doc/00230/34157/33031.pdf https://archimer.ifremer.fr/doc/00230/34157/ |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2010-10 , Vol. 115 , N. C10030 , P. 1-12 |
op_relation |
doi:10.1029/2009JC005894 10670/1.v0s6st https://archimer.ifremer.fr/doc/00230/34157/33031.pdf https://archimer.ifremer.fr/doc/00230/34157/ |
op_doi |
https://doi.org/10.1029/2009JC005894 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
115 |
container_issue |
C10 |
_version_ |
1766205735319896064 |