INDIAN GEOGRAPHY

Detailed explanation-1: -sea interactions collectively referred to as the El Niño/Southern Oscillation (ENSO). They occur every two to seven years and typically last for 9 to 12 months, and have widespread impacts on weather around the world.

Detailed explanation-2: -Episodes of El Niño and La Niña typically last nine to 12 months, but can sometimes last for years. El Niño and La Niña events occur every two to seven years, on average, but they don’t occur on a regular schedule. Generally, El Niño occurs more frequently than La Niña.

Detailed explanation-3: -El Niño and La Niña are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every 3-7 years on average. Together, they are called ENSO (pronounced “en-so”), which is short for El Niño-Southern Oscillation.

Detailed explanation-4: -Major ENSO events were recorded in the years 1790–93, 1828, 1876–78, 1891, 1925–26, 1972–73, 1982–83, 1997–98, and 2014–16. Typically, this anomaly happens at irregular intervals of two to seven years, and lasts nine months to two years. The average period length is five years.

Detailed explanation-5: -El Niño events occur irregularly at two-to seven-year intervals. However, El Niño is not a regular cycle, or predictable in the sense that ocean tides are. El Niño was recognized by fishers off the coast of Peru as the appearance of unusually warm water.