2007-03-27 04:55:20 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Weather
El Nino is typically a year, followed the next year by a La Nina (the exact oposite effects).
2007-03-27 04:59:44 · answer #1 · answered by QFL 24-7 6 · 2⤊ 0⤋
A strong El Niño can last a year or more before conditions return to normal. If you read the bit above about Rossby and Kelvin waves (you did, didn't you?) then you know that it lasts more or less as long as it takes the interior-ocean waves to travel all the way over to the coast of Asia, get reflected, and travel back. You can also look at the Historical El Niño section, which has a plot showing the last 30 years of El Niños, and judge for yourself.
2007-03-27 05:02:07 · answer #2 · answered by Anonymous · 1⤊ 0⤋
Very good question. Neither of your answers thus far are correct. So here is a short scientific answere. An El Niño event usually lasts for several seasons, and, along with its other effects, represents an interruption of the "normal" seasonal cycle of the tropical climate. After a few seasons, and usually during spring time (in the Northern Hemisphere), the seasonal cycle reasserts itself and the tropical ocean cools back to the normal east-to-west sea-surface temperature gradients.
2007-03-27 05:24:08 · answer #3 · answered by 1ofSelby's 6 · 2⤊ 0⤋
usually about 9 months.
2007-03-29 23:23:22 · answer #4 · answered by Will 5 · 0⤊ 0⤋