Impact of ENSO and the Indian Ocean Dipole on the north‐east monsoon rainfall of Tamil Nadu State in India

Tamil Nadu State in south‐eastern India receives most of its rainfall from October through December, a phenomenon known as north‐east monsoon rainfall (NEMR). Tamil Nadu's south‐west monsoon rainfall (SWMR), received between June and September, correlates positively with the Southern Oscillation Index (SOI), whereas NEMR correlates negatively. We undertook a study to investigate the relationship between global teleconnection indicators, namely the El Niño‐Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), and precipitation over Tamil Nadu during NEMR. The results showed that NEMR had significant positive correlation with Niño‐3 sea‐surface temperatures (SST) in July. The statistical relationships between the IOD and NEMR were much weaker than those between ENSO and NEMR.

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