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globalchange

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permafrost(103)
arctic(27)
active layer(19)
air temperature(18)
snow cover(18)
climate change(15)
canada(13)
cryosphere(12)
frozen ground(12)
numerical model(12)
thawing(12)
united states(12)
freeze-thaw cycle(11)
soil temperature(11)
alaska(10)
data set(10)
land surface(10)
surface temperature(10)
alps(9)
arctic ocean(9)
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