On the sub-decadal variability of South Atlantic Antarctic Intermediate Water
Key Points: - New observations show westward propagating salinity anomalies in S.Atlantic AAIW - They are the dominant form of variability on subdecadal timescales in a model - They have a speed close to the speed of second baroclinic mode Rossby waves Variability of Antarctic Intermediate Water sal...
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Language: | English |
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AGU (American Geophysical Union)
2012
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Online Access: | https://oceanrep.geomar.de/id/eprint/14712/ https://oceanrep.geomar.de/id/eprint/14712/1/2012GL051270.pdf https://doi.org/10.1029/2012GL051270 |
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ftoceanrep:oai:oceanrep.geomar.de:14712 2023-05-15T13:38:14+02:00 On the sub-decadal variability of South Atlantic Antarctic Intermediate Water McCarthy, G. D. King, B. A. Cipollini, P. McDonagh, E. L. Blundell, J. R. Biastoch, Arne 2012 text https://oceanrep.geomar.de/id/eprint/14712/ https://oceanrep.geomar.de/id/eprint/14712/1/2012GL051270.pdf https://doi.org/10.1029/2012GL051270 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/14712/1/2012GL051270.pdf McCarthy, G. D., King, B. A., Cipollini, P., McDonagh, E. L., Blundell, J. R. and Biastoch, A. (2012) On the sub-decadal variability of South Atlantic Antarctic Intermediate Water. Open Access Geophysical Research Letters, 39 (10). L10605. DOI 10.1029/2012GL051270 <https://doi.org/10.1029/2012GL051270>. doi:10.1029/2012GL051270 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/2012GL051270 2023-04-07T15:04:20Z Key Points: - New observations show westward propagating salinity anomalies in S.Atlantic AAIW - They are the dominant form of variability on subdecadal timescales in a model - They have a speed close to the speed of second baroclinic mode Rossby waves Variability of Antarctic Intermediate Water salinity in the South Atlantic is investigated on interannual and intradecadal timescales. Novel observations of slow, westward propagating salinity anomalies in Argo data are presented. The features have no corresponding signal in temperature and are anomalous in density. Analysis of 40 years of model output supports the existence of these westward propagating salinity anomalies and indicates that they are typical occurrences in time. The features are intensified in a latitude band around 30°S associated with the propagation of Agulhas rings. However, the features are much larger than Agulhas rings and occur on decadal timescales in the model. They propagate westward with speeds of 2.3 cm/s in observations, and 1.7 cm/s in model data. They are more consistent with planetary waves than with the advection of large-scale salinity anomalies. The observation of these features has implications for the interpretation of salinity anomalies, such as the linking of hydrological cycle changes to salinity changes. Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Geophysical Research Letters 39 10 n/a n/a |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Key Points: - New observations show westward propagating salinity anomalies in S.Atlantic AAIW - They are the dominant form of variability on subdecadal timescales in a model - They have a speed close to the speed of second baroclinic mode Rossby waves Variability of Antarctic Intermediate Water salinity in the South Atlantic is investigated on interannual and intradecadal timescales. Novel observations of slow, westward propagating salinity anomalies in Argo data are presented. The features have no corresponding signal in temperature and are anomalous in density. Analysis of 40 years of model output supports the existence of these westward propagating salinity anomalies and indicates that they are typical occurrences in time. The features are intensified in a latitude band around 30°S associated with the propagation of Agulhas rings. However, the features are much larger than Agulhas rings and occur on decadal timescales in the model. They propagate westward with speeds of 2.3 cm/s in observations, and 1.7 cm/s in model data. They are more consistent with planetary waves than with the advection of large-scale salinity anomalies. The observation of these features has implications for the interpretation of salinity anomalies, such as the linking of hydrological cycle changes to salinity changes. |
format |
Article in Journal/Newspaper |
author |
McCarthy, G. D. King, B. A. Cipollini, P. McDonagh, E. L. Blundell, J. R. Biastoch, Arne |
spellingShingle |
McCarthy, G. D. King, B. A. Cipollini, P. McDonagh, E. L. Blundell, J. R. Biastoch, Arne On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
author_facet |
McCarthy, G. D. King, B. A. Cipollini, P. McDonagh, E. L. Blundell, J. R. Biastoch, Arne |
author_sort |
McCarthy, G. D. |
title |
On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
title_short |
On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
title_full |
On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
title_fullStr |
On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
title_full_unstemmed |
On the sub-decadal variability of South Atlantic Antarctic Intermediate Water |
title_sort |
on the sub-decadal variability of south atlantic antarctic intermediate water |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/14712/ https://oceanrep.geomar.de/id/eprint/14712/1/2012GL051270.pdf https://doi.org/10.1029/2012GL051270 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/14712/1/2012GL051270.pdf McCarthy, G. D., King, B. A., Cipollini, P., McDonagh, E. L., Blundell, J. R. and Biastoch, A. (2012) On the sub-decadal variability of South Atlantic Antarctic Intermediate Water. Open Access Geophysical Research Letters, 39 (10). L10605. DOI 10.1029/2012GL051270 <https://doi.org/10.1029/2012GL051270>. doi:10.1029/2012GL051270 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2012GL051270 |
container_title |
Geophysical Research Letters |
container_volume |
39 |
container_issue |
10 |
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n/a |
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n/a |
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1766103103858278400 |