Subsurface influence on SST in the tropical Indian Ocean: structure and interannual variability
作者： Suryachandra A Rao , Swadhin K Behera , None
DOI: 10.1016/J.DYNATMOCE.2004.10.014
关键词: Geology 、 Ekman transport 、 Oceanography 、 Indian Ocean Dipole 、 Equator 、 Forcing (mathematics) 、 Sea surface temperature 、 Climatology 、 Ocean dynamics 、 Subtropical Indian Ocean Dipole 、 Rossby wave
摘要: Abstract Interannual variations of subsurface influence on SST in the Indian Ocean show strong seasonality. The confines to southern (SIO) boreal winter and spring; it is observed both sides equator summer fall. long Rossby waves are at heart this influence, contribute significantly coupled climate variability tropical (TIO). Principal forcing mechanism for generation these interannual relative two dominant signals tropics, namely El Nino Southern Oscillation (ENSO) Dipole (IOD), also discussed. Two distinct regions dominated by either above identified. IOD dominates off-equatorial waves, north 10°S, comes mainly from anomalous Ekman pumping associated with IOD. However, after demise activity December, dominantly forced ENSO, particularly south 10°S. It found that feedback northern flank ridge region (north 10°S) influences central east African rainfall process further holds considerable capability predicting one season ahead. Decadal modulation noticed during study period. 10°S coherently varies IOD, while ENSO latitude.
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