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Cryosphere glossary

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A B C D E F G H I J K L M N O P R S T U V W Y Z
A type of Pleistocene-age (formed 1.8 million to 10,000 years before present) permafrost that contains a significant amount of organic material with ice content of 50– to 90 percent by volume. Thawing yedoma is a significant source of atmospheric methane.
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yedoma_small.jpg

A yedoma in Russia shows the thick layer of ice and carbon material exposed along this body of water.

Vladimir Romanovsky
a general category of ice that represents the transition between nilas and first-year ice; usually 10 to 30 centimeters (4 to 12 inches) thick.
the ratio of increase in stress acting on a test specimen, to the resulting increase in strain, under constant transverse stress.