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Photographer's Note

meet the Grand Prismatic Spring, the largest hot spring in the United States, and the third largest in the world, next to those in New Zealand. the spring is approximately 75 by 91 meters (250 by 300 feet) in size and 49 meters (160 feet) deep. the spring discharges an estimated 2000 litres (560 gallons) of 71蚓 (160蚌) water per minute.

the vivid colours represent variations on the temperature of the water, and the impact this has on microbial life around the edges of the mineral-rich water. the thermophilic (heat-loving) bacteria produce colours ranging from green to red; the amount of colour in the microbial mats depends on the ratio of chlorophyll to carotenoids. the center of the pool is sterile due to extreme heat, and the deep blue colour of the water in the center of the pool results from a light-absorbing overtone of the hydroxy stretch of water. though this effect is responsible for making all large bodies of water blue, it is particularly intense in Grand Prismatic Spring because of the high purity and depth of the water in the middle of the spring.

you have to see the colours to believe it. we found a nice hill just nex to the Spring (the hill was quite steep though, so dragging the tripods up there along the barely visible path was fun), and this is the view we saw. Kristaps has this close-up photo of the Spring.

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RAW, ISO 100, 20mm focal length and spot metering.

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Additional Photos by Kristine KL (avene) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1586 W: 134 N: 2932] (12675)
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