Anthropogenic aerosol forcing and the structure of temperature trends in the southern Indian Ocean

Cai, Wenju and Cowan, Tim and Dix, Martin and Rotstayn, Leon and Ribbe, Joachim and Shi, Ge and Wijffels, Susan (2007) Anthropogenic aerosol forcing and the structure of temperature trends in the southern Indian Ocean. Geophysical Research Letters, 34 (14). L14611. ISSN 0094-8276


Over the past decades surface warming in the southern subtropical Indian Ocean (IO) has been greater than that in other oceans. The warming penetrates to a depth of 800m, in contrast to the off-equatorial surface warming which co-exists with subsurface cooling. We examine the dynamics for this rich structure. Results from the 20th century experiments of the Intergovernmental Panel for Climate Change (IPCC) confirm that the southern sub-tropical IO surface-to-800m warming is greater than that in the Pacific
and Atlantic Oceans. Outputs from two targeted ensemble sets of coupled model experiments, one with and one without increasing anthropogenic aerosols, show that increasing aerosols strengthen the global Conveyor, and generate a greater poleward shift and intensification of the Agulhas outflow and its retroflection; the process increases the warming rate in the subtropics, and takes heat out of the off-equatorial region generating a cooling.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Awaiting Author's version. Deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 01:19
Last Modified: 02 Jul 2013 22:49
Uncontrolled Keywords: climate change; global warming; Indian Ocean; IPCC; climate models; aerosols; ocean circulation
Fields of Research : 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040605 Palaeoclimatology
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
04 Earth Sciences > 0401 Atmospheric Sciences > 040101 Atmospheric Aerosols
Socio-Economic Objective: D Environment > 96 Environment > 9602 Atmosphere and Weather > 960202 Atmospheric Processes and Dynamics
Identification Number or DOI: 10.1029/2007GL030380

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