National Geographic : 1999 Mar
ig Hot and Cold 4 Warmer 6°Fj Sea-surface temperature change than 4°0F normal A A i .ooler than normal A 2 w 2°C El Ninio F2°C LaNina - 54F 1950 1960 1970 1980 1990 slosh- ng cool and warm water. >ast 50 years their slow eated El Nino conditions )f the time and La Nina !3 percent of the time. 1. Info west c wn in the graph above is based on data from an area ctangle defines area depicted in cross sections below. Air gains heat and r from the warm ocear and rises, storm clou, centra rn Pacific flows ec syer, typically 500 over cooler, nutri nd blocks its norrr ong North and Sc a life there can su food. L Trade winds 1a balance bet Pacific water a the eastern Pa ts water in the :line, the bounty ater and the cc er. lies 130 feet Storm clouds form above warm surface water in the western Pacific.