On the sub‐decadal variability of South Atlantic Antarctic Intermediate Water
[1] 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...
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American Geophysical Union
2012
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ftunivmaynooth:oai:mural.maynoothuniversity.ie:12196 2024-04-28T08:02:58+00:00 On the sub‐decadal variability of South Atlantic Antarctic Intermediate Water McCarthy, Gerard King, B.A. Cipollini, P. McDonagh, E.L. Blundell, J.R. Biastoch, Arne 2012-05-21 text https://mural.maynoothuniversity.ie/12196/ https://mural.maynoothuniversity.ie/12196/1/McCarthy_sub-dedacal_2013.pdf en eng American Geophysical Union https://mural.maynoothuniversity.ie/12196/1/McCarthy_sub-dedacal_2013.pdf McCarthy, Gerard and King, B.A. and Cipollini, P. and McDonagh, E.L. and Blundell, J.R. and Biastoch, Arne (2012) On the sub‐decadal variability of South Atlantic Antarctic Intermediate Water. Geophysical Research Letters, 39 (10). L10605. ISSN 0094-8276 Article PeerReviewed 2012 ftunivmaynooth 2024-04-09T23:30:38Z [1] 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 Maynooth University ePrints and eTheses Archive (National University of Ireland) |
institution |
Open Polar |
collection |
Maynooth University ePrints and eTheses Archive (National University of Ireland) |
op_collection_id |
ftunivmaynooth |
language |
English |
description |
[1] 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, Gerard King, B.A. Cipollini, P. McDonagh, E.L. Blundell, J.R. Biastoch, Arne |
spellingShingle |
McCarthy, Gerard 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, Gerard King, B.A. Cipollini, P. McDonagh, E.L. Blundell, J.R. Biastoch, Arne |
author_sort |
McCarthy, Gerard |
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 |
American Geophysical Union |
publishDate |
2012 |
url |
https://mural.maynoothuniversity.ie/12196/ https://mural.maynoothuniversity.ie/12196/1/McCarthy_sub-dedacal_2013.pdf |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://mural.maynoothuniversity.ie/12196/1/McCarthy_sub-dedacal_2013.pdf McCarthy, Gerard and King, B.A. and Cipollini, P. and McDonagh, E.L. and Blundell, J.R. and Biastoch, Arne (2012) On the sub‐decadal variability of South Atlantic Antarctic Intermediate Water. Geophysical Research Letters, 39 (10). L10605. ISSN 0094-8276 |
_version_ |
1797574206605492224 |