El Niño and La Niña Explained
usoceangov
https://www.youtube.com/watch?v=wVlfyhs64IY

Transkript (automatisch erstellt)

0:06 Warmer or colder than average ocean temperatures in one part of the world can influence weather around the globe - boggles the mind, right?
0:14 Here’s how it works. During normal conditions, trade winds, which blow from east to west, push warm surface
0:21 waters towards Asia, piling it up in the western Pacific. In some years though, the trade winds weaken. The warm surface water moves eastward and
0:30 reduces upwelling of cold water off the coast of South America. Climatologists call this El Niño. Its climate impacts show up mostly in the wintertime over North America.
0:41 The warmer ocean fuels an intensification and southward shift of the jet stream. This brings flooding to the Southern United States and warmer, drier conditions over parts of
0:51 the Pacific northwest, northern U.S. and Canada. But eventually those trade winds pick up again and sometimes become even stronger than normal.
1:01 When that happens, they blow the warm water back into the western Pacific and restart the upwelling of cool water towards the surface in the eastern Pacific.
1:11 These strong trade winds are a signature of what is called La Niña, unusually cold conditions in the tropical Pacific that displace the Jet Stream northward. La Niña can lead to drought in the southern
1:22 US and cooler temperatures, heavy rains and flooding in the Pacific Northwest. El Niño and La Niña together are part of a cycle that influences extreme weather and
1:33 can impact food production, water supply and even human health not just in the US, but in many parts of the globe.