Answer: National Oceanic and Atmospheric Administration
Notes: The impact of El Niño and La Niña on the Indian monsoon is under study. The Oceanic Niño Index (ONI) is crucial for understanding the El Niño-Southern Oscillation (ENSO) dynamics. ONI is the primary indicator used by the National Oceanic and Atmospheric Administration (NOAA), a U.S. agency, to monitor ENSO. ONI measures the rolling 3-month average temperature difference in the surface waters of the east-central tropical Pacific near the International Dateline. An ONI value of +0.5 or higher indicates El Niño, while -0.5 or lower indicates La Niña.
