ALLena: Thaw depth measurements of the active layer in the Lena River Delta r...
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Active layer thickness (ALT) is one of currently two Essential Climate Variables related directly to permafrost regions as defined by the Global Climate Observing System (GCOS)...
活动层厚度（Active layer thickness, ALT）是目前由全球气候观测系统（Global Climate Observing System, GCOS）定义的两类直接关联多年冻土区的基本气候变量之一……
