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Interdecadal water mass changes in the Southern Ocean between 30E and 160E

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Aoki, S and Bindoff, NL and Church, JA (2005) Interdecadal water mass changes in the Southern Ocean between 30E and 160E. Geophysical Research Letters, 32 (L07607). pp. 1-5. ISSN 0094-8276

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Abstract

Interdecadal water mass changes in the Indian -Western
Pacific sectors of the Southern Ocean were investigated
using the Japanese Antarctic Research Expeditions and
historical hydrographic observations from the 1950s to
1990s. Freshening and cooling occurred on the neutral
density surfaces of 27.0 kgm3 equatorward of Sub-
Antarctic Front. Results for the area south of the Polar
Front show warm and saline anomalies and oxygen
decreases on the surfaces around 27.9 kgm3, which
correspond to the Upper Circumpolar Deep Water. These
latter anomalies are most simply explained by the mixing
of these shallow waters with warmer and fresher surface
waters. Steric sea level has also increased with an average
change of 1mmyr1 from the 1970s to 1990s. The changes
are larger north of the Sub-Antarctic Front, implying a
strengthening of the Antarctic Circumpolar Current. It
appears that the observed changes are consistent with the
results from coupled climate model results for a similar
period.

Item Type: Article
Journal or Publication Title: Geophysical Research Letters
Page Range: pp. 1-5
ISSN: 0094-8276
Identification Number - DOI: 10.1029/2004GL022220
Additional Information:

Copyright 2005 American Geophysical Union.

Date Deposited: 14 Mar 2008 00:29
Last Modified: 18 Nov 2014 03:31
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