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GEOPHYSICAL RESEARCH LETTERS,
VOL. 31,
L24207,
4 PP., 2004
doi:10.1029/2004GL021345
Decadal variability of the Indian Ocean dipole
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa, Japan
Meteorological Research Institute, Japanese Meteorological Agency, Tsukuba, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa, Japan
Using the Simple Ocean Data Assimilation (SODA), NCEP/NCAR reanalysis and the GISST datasets from 1950–1999, and an atmosphere-ocean coupled general circulation model, we explored the possible existence of decadal Indian Ocean Dipole (IOD) variability for the first time. We find that there are strong decadal IOD events, and that the time series of the decadal IOD and decadal ENSO indices are not well correlated. The simulated decadal signal of the IOD index is highly correlated with the 20°C isotherm depth anomaly, indicating that ocean dynamics is involved in the decadal IOD. It is also associated with the zonal wind anomaly. We suggest that the decadal IOD in the tropics is interpreted as decadal modulation of the interannual IOD events.
Received 26 August 2004; accepted 19 November 2004; published 23 December 2004.
Citation: (2004), Decadal variability of the Indian Ocean dipole, Geophys. Res. Lett., 31, L24207, doi:10.1029/2004GL021345.
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