Seasonal soil active layer measurements from a Circumpolar Active Layer Monitoring (CALM) grid, (U12A) Toolik 1 kilometer grid, Alaska.

• Main Author: Nikolay Shiklomanov
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center 2023
• Subjects: Permafrost; Earth Science; Cryosphere; Active Layer; Grid; 500 Meters to 1 Kilometer; Probes; Field Survey; Weekly to Monthly; Active layer monitoring; Active layer thickness; permafrost; Tundra; Alaska
• Online Access: https://search.dataone.org/view/urn:uuid:4606fc1a-b629-42fb-a28f-71424393cd51

This site is registered with the Circumpolar Active Layer Monitoring (CALM) program. It is one among a network of sites that represent a coordinated effort to standardize the collection and access to thaw measurements in representative undisturbed permafrost landscapes. This dataset contains long-term spatial thaw depth observations using mechanical probing on dates indicated by file column headers. To ensure relative consistency within the record, end-of-season measurement dates are within the same Julian calendar week during the height of the thaw season (mid-August to mid-September). It is important to note that the date of maximum annual thaw, interpreted as the active layer thickness, can vary from year to year and between sites.