Long-Term Active Layer and Ground Surface Temperature Trends: Results of Observations at Alaskan CALM Sites Nikolai Shiklomanov, University of Delaware.

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Presentation transcript:

Long-Term Active Layer and Ground Surface Temperature Trends: Results of Observations at Alaskan CALM Sites Nikolai Shiklomanov, University of Delaware

CIRCUMPOLAR ACTIVE-LAYER MONITORING (CALM) NETWORK

Ground Surface Temperature Thaw depth Frost Heave / Thaw Subsidence CALM Observations

CALM Sampling Strategy

Active Layer Trends for Characteristic North Slope Landscapes

North SlopeInterior

Seasonal Progression of Thaw Depth

Trends of Air and Ground Temperatures within Bioclimatic Zones

The Length of Thawing Period at the Ground Surface within Bioclimatic Zones

Detection of Frost Heave and Thaw Settlement within Representative Landscapes. Use of high-precision Differential Global Positioning System (DGPS) technology. Three primary locations representative of main physiographic provinces. Spatially-oriented observations at various characteristic landscapes. 36 observational points in each landscape unit. Observations were initiated in 2001 and were conducted twice a year (June and August).

TRANSITION LAYER (TL) TL Transition Layer – boundary layer (0.1–2.0 m) between the active layer and permanently frozen part of permafrost. Shur Y.L., 1988

Thaw Settlement within Representative Landscapes.

R 2 =0.63 R 2 =0.91 ALT vs (ALT is as measured by metal probe) ALT vs (ALT is corrected for ground subsidence)

Thank you