frozen ground or permafrost

two-layer permafrost

ground in which two layers of permafrost are separated by a layer of unfrozen ground.

turf-banked (solifluction) terrace

a solifluction terrace with its front covered by a vegetation mat.

turf-banked (solifluction) lobe

a solifluction lobe with its front covered by a vegetation mat.

turf hummock

a hummock consisting of vegetation and organic matter with or without a core of mineral soil or stones.

turbic cryosol

a mineral soil showing marked evidence of cryoturbation, as indicated by broken horizons and displaced material.

tundra

treeless terrain, with a continuous cover of vegetation, found at both high latitudes and high altitudes.

transient talik

a layer or body of unfrozen ground (in a permafrost area) that is gradually being eliminated by freezing.

total water content (of frozen ground)

the total amount of water (unfrozen water plus ice) contained in soil or rock.

total annual thawing index

the cumulative number of degree-days, calculated by adding all the positive mean daily air temperatures (degrees Celsius) for a specific station during a calendar year.

total annual freezing index

the cumulative number of degree-days, calculated by adding all the negative mean daily air temperatures (degrees Celsius) for a specific station during a calendar year.

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