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SUMMARY:Multi-decadal trends of ocean circulation in the southeast Indian 
 Ocean - Ming Feng (CSIRO)
DTSTART:20110120T110000Z
DTEND:20110120T120000Z
UID:TALK28100@talks.cam.ac.uk
CONTACT:Zhaomin Wang
DESCRIPTION:On interannual and decadal time scales\, ocean circulation in 
 the southeast Indian Ocean\, the Indonesian Throughflow and the Leeuwin Cu
 rrent system\, is strongly modulated by climate variability in the tropica
 l Pacific. Stronger trade winds and subtropical cells in the Pacific corre
 spond to a stronger Indonesian Throughflow and a stronger Leeuwin Current\
 , due to dynamic connections of the Pacific and the southeast Indian Ocean
  through equatorial and coastal waveguides. Historical sea level records r
 eveal that a strengthening of the Pacific subtropical cells since the earl
 y‐1990’s has reversed a multi‐decadal weakening tendency from the 19
 60’s. Multi-decadal weakening trend of the Pacific trade winds during 19
 60’s to early 1990’s has induced cooling anomalies in the thermocline 
 depth of the equatorial western Pacific\, whereas the rebound of the trade
 s after 1994 has almost reversed the thermocline anomalies. The reversal o
 f multi-decadal signals has transmitted into the southeastern Indian Ocean
 \, causing a decline in the southward transports of the Indonesian Through
 flow and the Leeuwin Current by 20-30% before 1994 followed by a rebound o
 f the transport up to the present\, according to high-resolution ocean mod
 els. An ensemble of coupled climate models for the Intergovernmental Panel
  on Climate Change forced by observed anthropogenic green-house gases\, ho
 wever\, produces a much weaker decline trend in the current transports dur
 ing the second half of the 20th century and no reversal. The discrepancy s
 uggests that the observed multi-decadal trends of the internal climate sys
 tem are larger than the climate-change-induced secular trend during the pa
 st few decades\, so that long instrumental records are necessary for the d
 etection of human induced global change signals in the two circulation sys
 tems.
LOCATION:British Antarctic Survey\, Room 330B
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