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  • Cai, W., T. Cowan, M. Dix, L. Rotstayn, J. Ribbe, G. Shi, and S. Wijffels, 2007: Anthropogenic aerosol forcing and the structure of temperature trends in the southern Indian Ocean. Geophys. Res. Lett., 34, L14611, doi:10.1029/2007GL030380.

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 800 m,
in contrast to the off-equatorial surface warming which coexists
with subsurface cooling. We examine the dynamics
for this rich structure. Results from the 20th century
experiments of the Intergovernmental Panel on Climate
Change (IPCC) confirm that the southern subtropical IO
surface-to-800 m 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.


Full Article: http://www.agu.org/journals/gl/gl0714/2007GL030380/

Last Updated: 2007-12-12

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