Answer :
From the following, Sea ice coverage in Greenland is not an index that scientists use to determine phases of ENSO.
El Niño–Southern Oscillation is an irregularly periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, affecting the climate of much of the tropics and subtropics.
ENSO is one of the most important climate phenomena on Earth because it helps in changing atmospheric circulation. which in turn, influences temperature and precipitation across the globe.
Sea ice coverage in Greenland is the ice sheet that roughly covers 80% of Greenland.
To know more about ENSO,
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