https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/2e544263-d92f-46c2-9568-25e36d0b9825 ACTIVE LAYER Date=2024-10-01 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=American Meteorological Society Glossary of Meteorology Online "http://amsglossary.allenpress.com/glossary" New Value=American Meteorological Society Glossary of Meteorology Online "http://amsglossary.allenpress.com/glossary" Date=2024-10-01 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 10270ee0-8d85-4c75-9fa2-49e7a9755cb3 relationship type: null relationship value: null generated by: null Date=2024-10-01 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Active layer, also called frost zone or mollisol, is part of the soil included with the suprapermafrost layer (i.e., existing above permafrost) that usually freezes in winter and thaws in summer. Its bottom surface is the frost table, beneath which may lie permafrost or talik. The depth of the active layer varies anywhere from a few inches to several feet. New Value=Active layer, also called frost zone or mollisol, is part of the soil included with the suprapermafrost layer (i.e., existing above permafrost) that usually freezes in winter and thaws in summer. Its bottom surface is the frost table, beneath which may lie permafrost or talik. The depth of the active layer varies anywhere from a few inches to several feet. Active layer, also called frost zone or mollisol, is part of the soil includedwith the suprapermafrost layer (i.e., existing above permafrost) that usuallyfreezes in winter and thaws in summer. Its bottom surface is the frost table, beneath which may lie permafrost ortalik. The depth of the active layer varies anywhere from a few inches toseveral feet. 2024-10-01 15:43:55.0