Grand Prismatic Spring - Hot n Vivid Nature
This colorful boiling place is known as Grand Prismatic Spring, located in the Yellowstone National Park, United States. This vividly colored hot spring exemplifies Yellowstone's world-renowned geothermal features. Mineral deposits next to the spring are colored by microbes that thrive in hot water.
It is about 250 by 300 feet (75 by 91 meters) in size and 160 feet (49 meters) deep, discharging an estimated 560 gallons (2000 liters) of 160°F (71°C) water/minute.
The vivid colors in the spring ranging from green to brilliant red and orange are the result of algae and pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water, the amount of color dependent on the ratio of chlorophyll to carotenoids produced by the organisms. The center of the pool is sterile due to extreme heat.
During summer the chlorophyll content of the organisms is low and thus the mats appear orange, red, or yellow. But in winter, the mats are usually dark green because sunlight is more scarce and the microbes produce more chlorophyll to compensate, thereby masking the carotenoid colors.
The deep azure blue color of the water in the center of the pool results from a light-absorbing overtone of the hydroxide stretch of water. While this effect is responsible for making all large bodies of water blue, it’s particularly intense in Grand Prismatic Spring due to the high purity and depth of the water in its center.
