The structural properties of subarctic lake ice are influenced by meteorological and environmental factors including ebullition of greenhous gases from the lake sediment. We install 300 seismic sensors on and around Lake Pääjärvi, 100 km north of Helsinki, to record the elastic waves propagating in the ice sheet. Using seismic methods we study the dynamic ice response to environmental drivers, yielding high-resolution icequake distributions indicative of ice deformation patterns. Supported by water sampling and sounding we aim to resolve the variation of degassing methane that interacts with the ice to explore the applicability of seismic lake ice tomography for improved estimates of greenhouse gas emissions. The DYNALake project contributes to safe commercial and recreational participation in seasonal cryo environments, and opens new ways for climate monitoring. Two videos on project related pilots explain basic concepts: youtube.com/watch?v=oSst2P_rr_s, vimeo.com/ondemand/220781

2024

2028