What are the ENSO cycles?
The El Niño-Southern Oscillation (ENSO) is a recurring climate pattern involving changes in the temperature of waters in the central and eastern tropical Pacific Ocean. El Niño and La Niña are the extreme phases of the ENSO cycle; between these two phases is a third phase called ENSO-neutral.
What are the two parts of the ENSO weather cycle?
Though ENSO is a single climate phenomenon, it has three states, or phases, it can be in. The two opposite phases, “El Niño” and “La Niña,” require certain changes in both the ocean and the atmosphere because ENSO is a coupled climate phenomenon. “Neutral” is in the middle of the continuum.
How long are ENSO cycles?
How long does ENSO last? El Niño typically lasts 9–12 months, and La Niña typically lasts 1–3 years. Both tend to develop during March–June, reach peak intensity during December–April, and then weaken during May–July. However, prolonged El Niño episodes have lasted 2 years, and even as long as 3-4 years.
What is ENSO class 9 geography?
Explanation: “ENSO” refers to the El Niño/Southern Oscillation, the interaction between the atmosphere and ocean in the tropical Pacific that results in a somewhat periodic variation between between below-normal and above-normal sea surface temperatures and dry and wet conditions over the course of a few years.
How do ENSO cycles cause drought?
Temperature anomalies provide the key to ENSO, which, in turn, is thought to trigger the occurrence of droughts. When this happens, cool water normally found along the coast of Peru is replaced by warmer water. They involve the build-up of cooler-than-usual subsurface water in the tropical part of the Pacific.
Will there be an El Niño in 2021?
The predictions for September-November 2021 indicate an 60% likelihood that ENSO-neutral conditions will continue, with the likelihood for La Niña at 40%; no model predicts development of El Niño conditions at this time.
What is ENSO in geography Upsc?
The ENSO is a recurring climatic pattern involving temperature changes in the waters of the eastern and central tropical Pacific Ocean, and changes in the patterns of upper and lower-level winds, sea level pressure, and tropical rainfall across the Pacific Basin.
