Analysis of Southern Oscillation Index (SOI)trends indicates
A)La Nina episodes are becoming more common.
B)El Nino episodes are becoming more common.
C)the frequency of La Nina and El Nino is equal.
D)none of the above.

Question

Quizplus · Accepted Answer

The Southern Oscillation Index (SOI) is used to determine the strength and frequency of El Nino and La Nina episodes. A decreasing trend in the SOI would suggest more frequent occurrences of El Nino while an increasing trend would suggest more frequent occurrences of La Nina. Recent analysis of SOI trends has shown a decrease, indicating that El Nino episodes are becoming more common. Therefore, option B is the best choice.

Analysis of Southern Oscillation Index (SOI)trends Indicates