Glacial Ice - South Sawyer Glacier, Alaska
Blue glacial ice of an iceberg near the terminus of South Sawyer Glacier at the end of Tracy Arm, a 30+ mile fjord south of Juneau, Alaska. Located within the Tongass National Forest and Tracy Arm-Fords Terror Wilderness, Southeast Alaska (aka the'Inside Passage').
The ice appears blue due to how it was formed and how light passes through it. Blue ice exists when: a) air bubbles typically found in ice were compressed out of the ice; and b) the compressed ice absorbs other colors of the light spectrum (i.e. red, orange, yellow and green wavelengths) more efficiently that the color blue. The result of this absorption is that the glacier appears blue.