Decadal and interannual variability of the Indian Ocean SST

The variability of the Indian Ocean on interannual and decadal timescales is investigated in observations, coupled model simulation and model experiment. The Indian Ocean Dipole (IOD) mode was specifically analyzed using a data-adaptive method. This study reveals one decadal mode and two interannual...

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Bibliographic Details
Published in:Climate dynamics 2016-01, Vol.46 (1-2), p.57-70
Main Authors: Krishnamurthy, Lakshmi, Krishnamurthy, V.
Format: Article
Language:English
Subjects:
Climate system
Climatology
Decades
Earth and Environmental Science
Earth Sciences
El Nino
Geophysics/Geodesy
Marine
Observations
Ocean-atmosphere interaction
Oceanography
Oceans
Precipitation variability
Sea surface temperature
Simulation
Southern Oscillation
Surface chemistry
Temperature effects
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Summary:The variability of the Indian Ocean on interannual and decadal timescales is investigated in observations, coupled model simulation and model experiment. The Indian Ocean Dipole (IOD) mode was specifically analyzed using a data-adaptive method. This study reveals one decadal mode and two interannual modes in the sea surface temperature (SST) of the IOD. The decadal mode in the IOD is associated with the Pacific Decadal Oscillation (PDO) of the North Pacific SST. The two interannual modes are related to the biennial and canonical components of El Niño-Southern Oscillation (ENSO), consistent with previous studies. This study hypothesizes that the relation between the Indian Ocean and the North Pacific on decadal scale may be through the northerly winds from the western North Pacific. The long simulation of Community Climate System Model version 4 also indicates the presence of IOD modes associated with the decadal PDO and canonical ENSO modes. However, the model fails to simulate the biennial ENSO mode in the Indian Ocean. The relation between the Indian Ocean and North Pacific Ocean is further supported by the regionally de-coupled model experiment.
ISSN:0930-7575
1432-0894
DOI:10.1007/s00382-015-2568-3