Characteristics of Ice Bottom Topography from the Sea of Okhotsk off Hokkaido: Observation Results in 2007

摘要

Bottom-mounted IPS and ADCP were used to monitor the drafts and drifts of the pack ice passing over the mooring site on the Sea of Okhotsk off Hokkaido. A spectrum of sea ice bottom topography (draft profile) with non-stationary characteristics was estimated by the locally stationary AR model to compare it with the results in the past. The normalized spectrum of ice bottom topography might be common regardless of spatial and temporal component. Also, we found that the significant amplitude of sea ice draft, which means the standard deviation multiplied by 3.4, would give a subjective/intuitive the height of roughness of the bottom topography.