File:Hardangerfjord bloom 2020.jpg

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Hardangerfjord Emiliania huxleyi plankton bloom, May 2020

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English: Emiliania huxleyi is about one-tenth the size of a human hair. But in high enough concentrations —a “bloom”—this single-celled phytoplankton becomes visible from space. In May 2020, a vivid bloom of E. huxleyi colored the surface waters of a fjord in southern Norway.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite acquired this image of Hardangerfjord on May 30, 2020. Blooms can persist for several weeks, but cloud-free views of the entire fjord—Norway’s second-longest—can be hard to come by. Natural-color satellite images show a hint of color on May 25, and by June 10 vivid color was still visible between the clouds.

E. huxleyi is the most abundant species of coccolithophore, a type of phytoplankton that builds itself a shell of calcium carbonate disks, or “coccoliths.” The shells are so reflective that they can make otherwise dark blue water appear milky blue-green. The photo below, by Irene Huse of Norway’s Institute of Marine Research, shows the ship-based view of water in Hardangerfjord that was turned turquoise by E. huxleyi. [see link]

Spring and early summer are common times to see phytoplankton blooms in the North and Norwegian seas. In May and June 2019, a stunning bloom, likely composed primarily of E. huxleyi, showed up along the Norwegian coast and filled Sognefjord—the country’s longest and deepest fjord.

Coccolithophores tend to be good competitors for nutrients, so they can grow well even under low-nutrient conditions that limit other phytoplankton. But other phytoplankton turn up in this region as well, and not all are as harmless as E. huxleyi. In 2019, a bloom of Chrysochromulina leadbeateri in the waters off northern Norway suffocated millions of farmed salmon.

NASA Earth Observatory image by Joshua Stevens, using MODIS data from NASA EOSDIS/LANCE and GIBS/Worldview. Story by Kathryn Hansen.
Date
Source https://earthobservatory.nasa.gov/images/146843/norwegian-fjord-turns-turquoise?src=eoa-iotd
Author Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite
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(Reusing this file)
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current14:03, 20 June 2020Thumbnail for version as of 14:03, 20 June 2020720 × 480 (125 KB)Tillman (talk | contribs){{Information |description ={{en|1=Emiliania huxleyi is about one-tenth the size of a human hair. But in high enough concentrations —a “bloom”—this single-celled phytoplankton becomes visible from space. In May 2020, a vivid bloom of E. huxleyi colored the surface waters of a fjord in southern Norway. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite acquired this image of Hardangerfjord on May 30, 2020. Blooms can persist for several weeks, but cloud-free...

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