Grand Prismatic Spring in Yellowstone National Park

Friday, 31 January 2020 - 11:00 am (CET/MEZ) Berlin | Author/Destination:
Category/Kategorie: General, Environment
Reading Time:  3 minutes

© Brocken Inaglory/cc-by-sa-3.0

© Brocken Inaglory/cc-by-sa-3.0

The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world, after Frying Pan Lake in New Zealand and Boiling Lake in Dominica. It is located in the Midway Geyser Basin.

Grand Prismatic Spring was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match most of those seen in the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue.

Midway Geyser Basin © NPGallery - Neal Herbert © flickr.com - James St. John/cc-by-2.0 © flickr.com - James St. John/cc-by-2.0 © Brocken Inaglory/cc-by-sa-3.0 © flickr.com - Domenico Salvagnin/cc-by-2.0 © National Park Service - Jim Peaco
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Midway Geyser Basin © NPGallery - Neal Herbert
The first records of the spring are from early European explorers and surveyors. In 1839, a group of fur trappers from the American Fur Company crossed the Midway Geyser Basin and made note of a “boiling lake”, most likely the Grand Prismatic Spring, with a diameter of 300 feet (90 m). In 1870 the Washburn–Langford–Doane Expedition visited the spring, noting a 50-foot (15 m) geyser nearby (later named Excelsior).

The vivid colors in the spring are the result of microbial mats around the edges of the mineral-rich water. The mats produce colors ranging from green to red; the amount of color in the microbial mats depends on the ratio of chlorophyll to carotenoids and on the temperature gradient in the runoff. In the summer, the mats tend to be orange and red, whereas in the winter the mats are usually dark green. The center of the pool is sterile due to extreme heat. The deep blue color of the water in the center of the pool results from the intrinsic blue color of water. The effect is strongest in the center of the spring, because of its sterility and depth.

Read more on yellowstonepark.com – Grand Prismatic Spring and Wikipedia Grand Prismatic Spring (Smart Traveler App by U.S. Department of State - Weather report by weather.com - Global Passport Power Rank - Travel Risk Map - Democracy Index - GDP according to IMF, UN, and World Bank - Global Competitiveness Report - Corruption Perceptions Index - Press Freedom Index - World Justice Project - Rule of Law Index - UN Human Development Index - Global Peace Index - Travel & Tourism Competitiveness Index). Photos by Wikimedia Commons. If you have a suggestion, critique, review or comment to this blog entry, we are looking forward to receive your e-mail at comment@wingsch.net. Please name the headline of the blog post to which your e-mail refers to in the subject line.




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