Decadal changes in the South Indian Ocean thermocline
McDonagh, Elaine L.; Bryden, Harry L.; King, Brian A.; Sanders, Richard J. ORCID: https://orcid.org/0000-0002-6884-7131; Cunningham, Stuart A.; Marsh, Robert. 2005 Decadal changes in the South Indian Ocean thermocline. Journal of Climate, 18 (10). 1575-1590. 10.1175/JCLI3350.1
Full text not available from this repository.Abstract/Summary
A significant change in properties of the thermocline is observed across the whole Indian Ocean 32°S section between 1987 and 2002. This change represents a reversal of the pre-1987 freshening and decreasing oxygen concentrations of the upper thermocline that had been interpreted as a fingerprint of anthropogenic climate change. The thermocline at the western end of the section (40°–70°E) is occupied by a single variety of mode water with a potential temperature of around 13°C. The thermocline at the eastern end of the 32°S section is occupied by mode waters with a range of properties cooling from 11°C at 80°E to 9°C near the Australian coast. The change in θ–S properties between 1987 and 2002 is zonally coherent east of 80°E, with a maximum change on isopycnals at 11.6°C. Ages derived from helium–tritium data imply that the mode waters at all longitudes take about the same time to reach 32°S from their respective ventilation sites. Dissolved oxygen concentration changes imply that all of the mode water reached the section 20% faster in 2002 than in 1987.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1175/JCLI3350.1 |
ISSN: | 0894-8755 |
Date made live: | 08 Aug 2005 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/116480 |
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