NASA / JPL-CALTECH / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / SCIENCE PHOTO LIBRARY
El Nino comparison. Maps comparing Pacific Ocean heights on 5th September 1997 (left) and 4th September 2015. Blue and purple areas are lower than average and red and yellow areas are higher than average. Water expands as it warms and so warm areas of the ocean are higher than cool areas. The red areas across each centre are indicative of El Nino events. El Nino effects weather systems across the world, causing drier conditions in Australia and South-East Asia, and wetter and warmer conditions in the Americas, with often dire effects for agriculture. El Nino events of the 20th century. El Nino event, possibly the most powerful since 1950. TOPEX/Poseidon satellite, 2015 data obtained by the Ocean Surface Topography Mission (OSTM)/Jason-2 satellite.
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