• Welcome to the new nsidc.org! To get acquainted with what's changed, read our spotlight article: NSIDC.org website: New look and new features.

    Please note that we are in a beta launch of this website. During the beta phase, our website search may act unpredictably until the website stabilizes.

active air-cooled thermal pile
a foundation pile on which a cold air refrigeration system has been installed to remove heat from the ground.
Topic(s):
frozen ground or permafrost