A new sensor orbiting the Earth aboard NASAs satellite is now collecting the most detailed measurements ever made of the seas surface temperature every day all over the globe. Like a sophisticated thermometer in space, the Moderate-resolution Imaging Spectroradiometer (MODIS) is helping Earth scientists advance studies of how our worlds oceans and atmosphere interact in ways that drive weather patterns and, over the long term, define our climate.
The image above shows cold water upwelling near the coast of Peru (purple) and joining the South Equatorial Current, which flows westward across the Pacific Ocean. This MODIS sea surface temperature image from January 18, 2001 shows the ocean in normal conditions, but during an El Niño the waters off Peru are much warmer. Cold waters are black and dark green. Blue, purple, red, yellow, and white represent progressively warmer water.
For more information, high-res images, and animations, see: Terra Measures Sea Surface Temperature with Unprecedented Detail.