2 Normal Pacific Conditions In normal years , atmospheric pressure is greater in the eastern Pacific than in the western Pacific.The trade winds blow surface water from east to west.Warm water "piles up" in the western Pacific and sea level is higher than it is in the east.
3 Upwelling of cold, nutrient-rich water occurs along the western coast of South America More nutrients = more phytoplankton = food fishing
6 El NiñoFirst noticed off coast of Peru around Christmas, El Niño refers to the Christ childOccurs every 2 – 7 yearsUnusual and atmospheric conditionsTrade winds slack off or reverseWarm water moves eastwardUpwelling slacks off or stops completely
11 La NiñaOpposite effects of El NiñoStronger windsColder temperatures
12 Comparing El Niño and La Niña Warmer ocean tempsOccurs every 3-7 yearsWetter than normal summersWeak trade windsFewer Atlantic hurricanesLa NiñaColder ocean tempsFrequency unknownDrier than normal summersStrong trade windsIncreased hurricane activity in Atlantic