Anomalous aspects of the eddy saturation regime in the Southern Ocean
The eddy saturation behaviour is defined as the relative insensitivity of the Antarctic Circumpolar Current (ACC) volume transport to the strong increase of the wind stress field that, on the other hand, induces changes in the eddy field intensity (larger values of the Eddy Kinetic Energy – EKE). Ti...
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ftuninapoliparth:oai:ricerca.uniparthenope.it:11367/69122 2024-01-28T09:59:00+01:00 Anomalous aspects of the eddy saturation regime in the Southern Ocean Yuri Cotroneo Pierpaolo Falco Milena Menna Pierre marie Poulain Giorgio Budillon AA.VV. Cotroneo, Yuri Falco, Pierpaolo Menna, Milena marie Poulain, Pierre Budillon, Giorgio 2018 http://hdl.handle.net/11367/69122 https://www.geophysical-research-abstracts.net/ eng eng Copernicus Gesellschaft mbH country:DEU place:Göttingen ispartofbook:Geophysical Research Abstracts 2018 EGU general Assembly 2018 journal:GEOPHYSICAL RESEARCH ABSTRACTS http://hdl.handle.net/11367/69122 https://www.geophysical-research-abstracts.net/ info:eu-repo/semantics/conferenceObject 2018 ftuninapoliparth 2024-01-03T17:44:18Z The eddy saturation behaviour is defined as the relative insensitivity of the Antarctic Circumpolar Current (ACC) volume transport to the strong increase of the wind stress field that, on the other hand, induces changes in the eddy field intensity (larger values of the Eddy Kinetic Energy – EKE). Time series of drifter, satellite, XBT and Argo float data describe an ocean state close to the eddy saturation in the Pacific Sector of the Southern Ocean (PSSO) during the periods 1995-2006, 2008, 2010-2011 and 2014-2015. An anomalous behaviour is observed in 2012, when an high ACC transport value occurs at the end of a wind strengthening period, whereas the anomalies of the EKE are positive and a weak transport variation would be expected. Moreover, approximately in the same period, an atypical behaviour is observed also in the time series of the surface meridional Eddy Heat Fluxes (mEHF). In fact, southward increases of mEHF are generally concurrent with El Niño events, but the episode of 2011 is unusually related with a strong La Niña event. Different causes can generate the anomalous responses observed in the PSSO during the period 2011-2012; they can be related to the local and/or internal variability of the ACC (through positive feedback between the generation of mesoscale eddies, baroclinic instability and the dynamics of the mean circulation). Mesoscale eddy field definitely plays an important role in controlling both the zonal baroclinic transport variability and the poleward heat flux through the ACC fronts. Thus, in this work we focus on the eddy field, quantified in terms of EKE, and on the number and type of eddies inside the entire polar zone (defined by the Northern Subantarctic Front and Polar Front mean positions) and also in correspondence of each ACC front. Conference Object Antarc* Antarctic Southern Ocean Università degli Studi di Napoli "Parthenope": CINECA IRIS Antarctic Pacific Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Università degli Studi di Napoli "Parthenope": CINECA IRIS |
op_collection_id |
ftuninapoliparth |
language |
English |
description |
The eddy saturation behaviour is defined as the relative insensitivity of the Antarctic Circumpolar Current (ACC) volume transport to the strong increase of the wind stress field that, on the other hand, induces changes in the eddy field intensity (larger values of the Eddy Kinetic Energy – EKE). Time series of drifter, satellite, XBT and Argo float data describe an ocean state close to the eddy saturation in the Pacific Sector of the Southern Ocean (PSSO) during the periods 1995-2006, 2008, 2010-2011 and 2014-2015. An anomalous behaviour is observed in 2012, when an high ACC transport value occurs at the end of a wind strengthening period, whereas the anomalies of the EKE are positive and a weak transport variation would be expected. Moreover, approximately in the same period, an atypical behaviour is observed also in the time series of the surface meridional Eddy Heat Fluxes (mEHF). In fact, southward increases of mEHF are generally concurrent with El Niño events, but the episode of 2011 is unusually related with a strong La Niña event. Different causes can generate the anomalous responses observed in the PSSO during the period 2011-2012; they can be related to the local and/or internal variability of the ACC (through positive feedback between the generation of mesoscale eddies, baroclinic instability and the dynamics of the mean circulation). Mesoscale eddy field definitely plays an important role in controlling both the zonal baroclinic transport variability and the poleward heat flux through the ACC fronts. Thus, in this work we focus on the eddy field, quantified in terms of EKE, and on the number and type of eddies inside the entire polar zone (defined by the Northern Subantarctic Front and Polar Front mean positions) and also in correspondence of each ACC front. |
author2 |
AA.VV. Cotroneo, Yuri Falco, Pierpaolo Menna, Milena marie Poulain, Pierre Budillon, Giorgio |
format |
Conference Object |
author |
Yuri Cotroneo Pierpaolo Falco Milena Menna Pierre marie Poulain Giorgio Budillon |
spellingShingle |
Yuri Cotroneo Pierpaolo Falco Milena Menna Pierre marie Poulain Giorgio Budillon Anomalous aspects of the eddy saturation regime in the Southern Ocean |
author_facet |
Yuri Cotroneo Pierpaolo Falco Milena Menna Pierre marie Poulain Giorgio Budillon |
author_sort |
Yuri Cotroneo |
title |
Anomalous aspects of the eddy saturation regime in the Southern Ocean |
title_short |
Anomalous aspects of the eddy saturation regime in the Southern Ocean |
title_full |
Anomalous aspects of the eddy saturation regime in the Southern Ocean |
title_fullStr |
Anomalous aspects of the eddy saturation regime in the Southern Ocean |
title_full_unstemmed |
Anomalous aspects of the eddy saturation regime in the Southern Ocean |
title_sort |
anomalous aspects of the eddy saturation regime in the southern ocean |
publisher |
Copernicus Gesellschaft mbH |
publishDate |
2018 |
url |
http://hdl.handle.net/11367/69122 https://www.geophysical-research-abstracts.net/ |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
ispartofbook:Geophysical Research Abstracts 2018 EGU general Assembly 2018 journal:GEOPHYSICAL RESEARCH ABSTRACTS http://hdl.handle.net/11367/69122 https://www.geophysical-research-abstracts.net/ |
_version_ |
1789331632306520064 |