Which of the following takes place in cycles much longer than the time taken by an El Niño event?
A) Arctic Oscillation
B) North Atlantic Oscillation
C) Pacific Decadal Oscillation
D) La Niña
E) the greenhouse effect

Question

Quizplus · Accepted Answer

The Pacific Decadal Oscillation (PDO) takes place in cycles ranging from 20 to 30 years, much longer than the time taken by an El Niño event, which typically lasts for 1-2 years. The Arctic Oscillation (A), North Atlantic Oscillation (B), and La Niña (D) all occur on a shorter time scale than the PDO, with typical periods of a year or several years. The greenhouse effect (E) is not an atmospheric phenomenon that occurs in cycles.

Which of the Following Takes Place in Cycles Much Longer