Researchers have discovered that unusual swirling 'slicks' that occasionally appear on the Baltic Sea are actually made from floating tree pollen.
Scientists have finally identified the surprising origin of bizarre ocean slicks that appear to swirl around the surface of the Baltic Sea — tree pollen.
However, in a study published in January in the journal Remote Sensing of Environment , researchers analyzed the reflective properties of the mysterious substance and found that it more closely resembled pollen from pine trees . The appearance of the slicks and direct observations from local scientists later confirmed that this is what the slicks were made from, researchers wrote.
In February 2021, a study published in the journal Environmental Sciences revealed that in North America, pollen levels increased by 21% between 1990 and 2018, and that the pollen season lasted for around 20 days longer on average.
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