Satellites from the the National Aeronautics and Space Administration (NASA) has shown that more than half of the Earth’s oceans are green due to climate change disturbing marine ecosystems, a development which has spurred investigations from scientists.
Latest satellite data shows that over the last 20 years, colour shifts from blue to green have occurred over 56 per cent of the world’s oceans. The changes are particularly evident in tropical regions near the equator. And researchers say that this subtle greening of oceans points to the effect that climate change is having on life under the water.
According to reports, Nasa’s Modis-Aqua satellite picked up on a gradual shift from blue to predominantly green hues in over half of the world’s oceans. The area that has changed colour is greater than the entirety of the land on Earth.
BB Cael at the National Oceanography Centre in Southampton, UK, and his colleagues analysed the data from NASA and believe the green colouring is a sign of ecosystems changing due to climate change.
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While the exact cause are unconfirmed, BB Cael says it’s likely to be linked to the creatures at the base of most food chains – phytoplankton. These organisms also play a vital role in producing much of the oxygen we breathe and stabilising our atmosphere.
“The effects of climate change are already being felt in the surface marine microbial ecosystem,” the study notes.
According to the study’s authors, a change in the colour of the ocean could reflect a change in the state of its ecosystems. Deep blue indicates less life while greener hues indicate more activity from phytoplankton.
It paints a picture of what is going on in the surface layers of the water. The colour of the ocean can change from year to year with chlorophyll levels at the surface varying wildly. It makes it difficult to differentiate whether the shift from blue to green is being affected by climate change.
Story was adapted from euronews.green.
