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Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014, ERT Data


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Conaway, C.H., Johnson, C.D., Lorenson, T.D., Waldrop, M.P., and Swarzenski, P.W., 2020, Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014: U.S. Geological Survey data release,


Surface-based 2D electrical resistivity tomography (ERT) surveys were used to investigate the distribution of permafrost at wetland sites on the alluvial plain north of the Tanana River, 20 km southwest of Fairbanks, Alaska, in June and September 2014. The sites contained habitat types characteristic of interior Alaska, including thermokarst bog, forested permafrost plateau, and a rich fen. These habitats range from treed to open and vary in groundcover vegetation and peat thickness. Individual surveys used a cable with 56 electrodes at 2-m spacing. At a fen site, ERT surveys were performed across a mixed spruce forest area across a vegetation gradient into an open fen area. At a bog site,surveys were performed across a thermokarst [...]


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Our primary goals were to: (i) map shallow permafrost occurrence, (ii) identify how vegetation type is related to permafrost within this wetland complex, and (iii) examine depth to permafrost and existence of unfrozen areas, or other features useful in understanding or predicting changes in hydrologic connectivity of these wetlands to uplands and the riparian zone related to permafrost degradation.



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