NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
El Nino. Computer artwork based on satellite data of sea level and temperature in the Pacific in November 1997 during an El Nino event. North is towards upper left, with the Americas at upper right and Asia at upper left. The three- dimensional sea relief map shows higher sea levels (not to scale) in the east. It was created using NASA TOPEX satellite imagery. Sea temperatures, from NOAA's AVHRR satellite sensor and TAO sea moorings, vary from red (30 degrees celsius) to dark blue (8 degrees celsius). El Nino occurs when a warm tongue of water moves into the eastern Pacific, seriously affecting global weather patterns.
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