Author(s): Shinji Kioka; Yasuji Yamamoto; Shigeki Sakai; Takahiro Takeuti
Linked Author(s):
Keywords: IPS; ADCP; Sea ice; Draft; Bottom topography; Spectrum
Abstract: We have conducted sea ice surveys using Ice Profiling Sonar (IPS) and Acoustic Doppler Current Profiler (ADCP). This paper reports on the quantitative analysis results on the sea ice data, especially on ice bottom topography, obtained in 2004. and the renewed knowledge obtained by comparing the data with past results. From results of analysis of the sea ice bottom topography (draft profile) with non-stationary characteristics by the locally stationary AR model, we were able to make the assumption that although the average power (variance of draft depth) of each subinterval (span) considered locally stationary was different, the normalized spectra of the subintervals were identical, which indicated similar results as the previous data. We were able to obtain an important conclusion that the typical normalized spectrum of ice bottom topography (underside profile) might be common regardless of annual variations in ice draft.
Year: 2006