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 (yĕ′də-mə, yə-dō′-)
A type of permafrost consisting primarily of loess and organic material, believed to sequester large amounts of carbon.

[Archaic and regional Russian yedoma, backwoods, a place that lacks reindeer, yedoma, of Nenets origin; akin to Nenets yada, on foot (since the Nenets use reindeer to draw sledges and without them go on foot).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
The origin of underground ice is discussed, including the burial of glaciers, the creation of ice through cryosuction, ice injection, and through the growth of ice wedges that may lead to the formation of yedoma, a Russian term for ice complex.
The ice complex or yedoma is loess-like syngenetic frozen soils of the Pleistocene age with high thickness, forming the northern coastal lowlands, the plains of Central Yakutia, and the northeast.
Stephani, "Cryostratigraphy of late Pleistocene syngenetic permafrost (yedoma) in northern Alaska, Itkillik river exposure," Quaternary Research, vol.
"Spatial Analyses of Thermokarst Lakes and Basins in Yedoma Landscapes of the Lena Delta." The Cryosphere 5 (4): 849-867.
The transformation of illite and chlorite to randomly interstratified illite-smectite and chlorite-smectite respectively in circum-neutral to weakly acidic conditions has been documented for permafrost-affected soils Kriozems (Cryosols) formed in the cold, continental, climate of the Kolyma Lowland, North-East Siberia, as has the extremely weak intensity of chemical weathering of the Yedoma deposits (Alekseev et al., 2003).
Illite normally loses interlayer potassium and converts to a mixed layer dioctahedral illite-vermiculite in the upper acidic horizons of such soils or even to illitesmectite as it was shown for soils of Yedoma deposits (Alekseev et al., 2003) and it seems that this is a likely explanation for the loss of illite in the upper horizons of the Cryosols.
A team of researchers, led by Stockholm University, investigated an area of coastline at Yedoma, the northernmost point of the Siberian Arctic, and found that the amount of greenhouse gas being released exceeded their expectations.
The findings show that the Yedoma region, which has previously remained unstudied because of its remoteness, is releasing huge amounts of carbon from vast walls of ice which are collapsing into the sea.