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What is EL Nino? Simply put by Billy Kessler, an Oceanographer for the Pacific Marine Environmental Laboratory at NOAA-Seatle in his FAQ about El Ni?o: Suppose a relatively brief opposing wind occurs over the west Pacific warm pool. It may last for as little as one month. This starts and estward current that pushes the warm pool a little bit east of it's usual position. If the ocean and atmosphere were not coupled, then this motion would soon stop when it ran into the trade winds. But we have shown that the trade winds exist because of the temperature contrast between east and west. If the central Pacific is warmed by flow from the west, even a small amount, then the region of rising air will ten to move east with the warm water. That means the trade winds will also shrink back east a little, since those winds are caused by the rising air. But then the pressure of the trades holding up the sea surface slope to the west is weakened, and even more west Pacific water tries to slosh eastward. That wardms the central Pacific a little bit more, and the rising air moves further east, and the trades shrink more. This collapse continues until the water is warm across the Pacific, the trades are weak, and the thermocline zone between the warm upper-sunlit waters and the colder deep-sundeprived waters] and sea surface slope flatten out. When a cataylist weakens the easterly trade winds around the equator, warm water that is usually stockpiled around Indonesia slowly moves toward the South American coastline. This, in turn, warms the waters off the coast of South America several degrees. Because there is an interaction between the ocean and the atmosphere, the warm water warms the air near to the water. Since warm air rises, this creates instability (as you go up in altitude, air temperatures decrease, but if you get patches of warm air rising into a mass of cool air this causes conflicts or �instability' in the atmosphere). Most commonly, this instability influences the production of storms. Also, since the warm water has moved eastward and has taken its storm producing capabilities with it, the path of the Jet Stream, the directions in which storms travel, has also changed. Storms, during El Ni?o conditions are shot up into the general direction of the U.S. rather than the usual path into Mexico. This was partly why the California area experienced severe flooding during last winter. Because, El Ni?o conditions, on average, form every 2-7 years around Christmas time, Peruvian fishermen named the event, El Ni?o or "The Christ Child," in the mid-1500s. However, the event was not recognized as a large-scale event until the 1960s, when satalite technology became available. As mentioned above, the event is triggered by

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Referat DESPRE EL NINO

DESPRE EL NINO

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