NASA satellites have spotted what looks like a huge, green 'whirlpool' on the surface of the ocean - evidence of a dangerous trend.
Every summer, phytoplankton spread across the northern basins of the North Atlantic and Arctic Oceans, with blooms spanning hundreds and sometimes thousands of kilometres.
Blooms this summer off of Scandinavia seem to be particularly intense, and could be "strangling" the ocean beneath.
Phytoplankton and cyanobacteria consume the abundant nutrients in the Baltic (fuelled largely by runoff from sewage and agriculture) and reproduce in such vast numbers that their growth and decay deplete the oxygen content of the water.
On July 18, 2018, the Operational Land Imager (OLI) on Landsat 8 acquired a natural-colour image of a swirling green phytoplankton bloom in the Gulf of Finland, a section of the Baltic Sea. It's about 25km across, big enough to hold all of central and west Auckland, the Hauraki Gulf and the North Shore as far north as Albany.
The Finnish Environment Institute (SYKE) has observed the recent bloom from the water and found it to be mostly cyanobacteria.
In recent years, the proliferation of algae blooms in the Baltic Sea has led to the regular appearance of "dead zones" in the basin.
According to researchers from Finland's University of Turku, the dead zone this year is estimated to span about 70,000 square kilometres.
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A research team from Finland and Germany reported this month that oxygen levels in recent years in the Baltic Sea are at their lowest levels in the past 1500 years.
More frequent and massive blooms, combined with warming seas due to climate change, are making it harder for fish and other marine life to thrive in this basin.
7 News / Newshub.
