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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. and Biastoch, A. (2012) On the sub-decadal variability of South Atlantic Antarctic Intermediate Water Geophysical Research Letters, 39, (10), L10605. (doi:10.1029/2012GL051270).

Record type: Article

Abstract

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.

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Published date: 2012
Organisations: Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 340761
URI: http://eprints.soton.ac.uk/id/eprint/340761
ISSN: 0094-8276
PURE UUID: 0cdf5a4c-0063-4441-8f20-490e3b446229

Catalogue record

Date deposited: 02 Jul 2012 12:56
Last modified: 18 Jul 2017 05:41

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Contributors

Author: G.D. McCarthy
Author: B.A. King
Author: P. Cipollini
Author: E.L. McDonagh
Author: J.R. Blundell
Author: A. Biastoch

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