Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.’s Open University. Follow him on Twitter @sciencef1rst.
NASA and Joshua Stevens, using Landsat data from the U.S. Geological Survey and MODIS data from LANCE/EOSDIS Rapid Response.
The color of the ocean can be used as a gauge to assess what dwells in its upper layers. Deep blue waters, for instance, indicate an absence of life while green waters indicate the presence of plant-like microbes called phytoplankton that contain the green pigment chlorophyll. This is traditionally done by monitoring that green pigment, chlorophyll, which helps phytoplankton and plants harvest sunlight. Changes in chlorophyll can be seen in the ratio of blue versus green light reflected on the ocean surface, a balance that can be tracked with spaceborne satellites.
"This gives additional evidence of how human activities are affecting life on Earth over a huge spatial extent."To reach their current findings, Cael and fellow researchers analyzed ocean color measurements collected by the Moderate Resolution Imaging Spectroradiometer aboard the Aqua satellite.
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