Geomorphology and InSAR-Tracked Surface Displacements in an Ice-Rich Yedoma Landscape

Ice-ridge Yedoma terrain is susceptible to vertical surface displacements by thaw and refreeze of ground ice, geomorphological processes mass wasting, erosion sedimentation. Here we explore the relation between a 3 year data set InSAR measurements during season, features in an area Indigirka Lowlands, Northeast Siberia. The geomorphology presented map, based on interpretation high resolution visible spectrum satellite imagery, field surveys available from paleo-environmental research. main landforms comprise overlapping drained lake basins lakes, remnants Late Pleistocene deposits, floodplain high-sinuosity anastomosing river with ancient terrace remnants. spatial distribution study its surroundings influenced neotectonic movements. years measurement include 2 snowfall extreme flooding (2017–2018) 1 modest snowfall, early spring warm summer (2019). magnitude varies among years, show considerable variation. Distinct clusters displacement trajectories can be discerned, which relate ice conditions. Strong subsidence occurred particular 2019. In wet 2017, marked heave at plateau surfaces, likely accumulation top permafrost driven excess precipitation. variability high. This explored statistical analysis, attributed interaction various processes. Next volume change, also sedimentation (peat, colluvial deposition) shrinkage or swelling soils changing water content may have contributed. Tussock tundra areas covered 2017 2018 floods rates increase midsummer depths. We hypothesize that increased flood heights along Siberian lowland rivers potentially induce deeper margins, lowers drainage thresholds lakes. Both mechanisms tend area. CH 4 emission floodplains, but enhance carbon storage sedimentary environments.