How much of recent El Nino-backed warming was ‘man-made’, if any? NOAA has issued a La Niña watch so we may well see average temperatures going into reverse before too long.
El Niño is quickly fading. Sea surface temperatures are coming down in the tropical Pacific, and winds in the region have weakened. History tells us, and forecast models predict, that La Niña conditions will be quick on its heels.
Seeing the writing on the wall, NOAA issued a La Niña watch on Thursday. “Nearly all models predict further weakening of El Niño, with a transition to ENSO-neutral likely during late spring or early summer 2016,” NOAA’s Climate Prediction Center wrote. “Then, the chance of La Niña increases during the late summer or early fall.”
La Niña is El Niño’s cooler counterpart in the tropical Pacific Ocean. Whereas El Niño exhibits abnormally warm ocean temperatures and a strong atmospheric circulation across the equator, La Niña represents abnormally cold water. The cooler sea surface temperature pattern enhances the circulation in the tropics, called the Walker circulation.
The Walker circulation tends to dominate the weather across the equatorial Pacific. Air flows west toward Indonesia, where water is typically the warmest, and rises. This creates lots of thunderstorms and rain. During El Niño, this circulation is disrupted. The warmest water sloshes to the eastern side of the Pacific near South America. Air ends up rising closer to South America, and it sinks over Indonesia.
“During La Niña events … when waters in the western Pacific are even warmer than normal and waters in the eastern Pacific are even colder, it is like someone turned the normal Walker Circulation ‘up to 11,’” writes climate.gov’s Tom Di Liberto.
Full report with graphics: Temperatures Falling As El Niño Fades Quickly | The Global Warming Policy Forum (GWPF)
From NOAA’s ENSO blog: April 2016 El Niño/La Niña update: What goes up…