A Big Blue Swirl in the Ocean is a Sign of Microscopic Life

By Veronique Greenwood | February 22, 2012 1:13 pm


Along the top of this satellite image lies the coast of South Africa, but follow the sheets of clouds south about 500 miles, and a beautiful, incongruous-looking blue swirl appears. That plankton-laced eddy, which is 90 miles wide, is the oceanic version of a storm, spun off from a larger current and caused by roiling of water instead of air. Eddies in this region bring warm water from the Indian Ocean to the South Atlantic, and they can even pull nutrients up from the deep sea, fertilizing surface waters and causing blooms of plankton in areas that are otherwise rather devoid of life. It is just such a bloom that lends this eddy its cerulean hue.

Image courtesy of NASA’s Earth Observatory

CATEGORIZED UNDER: Environment, Space
  • Lance Endress

    Earth’s great blue spot = Jupiter’s great red spot!

  • D.L.Trebor

    What nonsense – this is obviously the location of a UFO crash-landing.

  • m

    Thank you Lance, insightful, concise and the sign of a brilliant intellect.

  • http://discovermagazine.com Iain

    Negative! Cross correlation is not indicated. Wishful thinking. Turbulence is just turbulence.


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