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El Nino

Science Weather Lesson

Chuck Chapa

on 11 February 2014

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Transcript of El Nino

Weather Phenomena
Thank you for your attention!
Satelitte images and data is collected in order to help better predict these phenomena. In recent years El Nino seems to out number La Nina 2 to 1.
And one more thing...
El Niño, an ocean phenomenon of the Pacific Ocean. El Niño occurs when the southeast trade winds slacken or cease, preventing cool, nutrient-rich water within the Peru Current from moving up from moderate depths to replace warm surface water. It is named El Nino because it usually occurs in December.
El Niño causes several other disturbances, among which is an altering of the path of the jet stream in the Northern Hemisphere, causing an unusual increase in precipitation in many areas.
Increased tropical storms
Brush Fires
Effects on animal/sea life population
El Nino
Effects on Weather
Effects on Humans
El Nino and La Nina
Scientists refer to the event when exceptionally cool water lies off the coast of South America as La Nina or "the baby girl." La Nina is a weather phenomena providing cooler water temperatures and enhanced upwelling.
La Nina
Strong La Nina events have been responsible for the opposite effects on climate as El Nino. For example, a major La Nina event in 1988 caused significant drought across North America.
Effects on Weather
Gulf Stream
The Gulf Stream is a powerful current in the Atlantic Ocean. It starts in the Gulf of Mexico and flows into the Atlantic at the tip of Florida, accelerating along the eastern coastlines of the United States and Newfoundland.
Causes of the Gulf Stream
The Gulf Stream, like all other ocean currents is mainly caused by wind as it creates friction when moving over the water. This friction then forces the water to move in the same direction. Because it is a western boundary current, the presence of land along the Gulf Stream's edges also aids in its movement.
Effects of the Gulf Stream
The greatest impact the Gulf Stream has on climate is found in Europe. Since it flows into the North Atlantic Current, it too is warmed (though at this latitude the sea surface temperatures are cooled considerably), and it is believed that it helps keep places like Ireland and England much warmer than they would otherwise be at such a high latitude.
In southern areas the gulf stream is also responsible for creating and strengthening hurricanes in the Gulf of Mexico with its warm waters.
Coriolis Effect
The Coriolis effect is the apparent curvature of global winds, ocean currents, and everything else that moves freely across the Earth’s surface.
The curvature is due to the rotation of the Earth on its axis. The effect was discovered by the nineteenth century French engineer Gaspard C. Coriolis.

If not for the Earth’s rotation, global winds would blow in straight north-south lines. What actually happens is that global winds blow diagonally. The Coriolis effect influences wind direction around the world in this way: in the Northern Hemisphere it curves winds to the right; in the Southern Hemisphere it curves them left.
Full transcript