00000nam 2200000zi 4500 9.936205 CaOODSP 20241007095055 m o d f cr |n||||||||| 240402e199312uubccd obt f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- DR52-11/11-1993E-PDF Greening, Michael Victor, 1961- author. Modelling Arctic ambient noise in the 2 - 200 Hz band / by M.V. Greening and P. Zakarauskas. Victoria, B.C. : Defence Research Establishment Pacific = Centre de recherches pour la défense pacifique : Research and Development Branch, Department of National Defence, December 1993 1 online resource (23, [4] pages) : charts text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 93-79 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (pages 22-23). "Short-term Arctic ambient noise spectra over the frequency band 2 - 200 Hz are presented along with a two-component noise model capable of reproducing these spectra. The model is based on the measured source spectrum and the spatial, temporal and source level distribution of both active pressure ridging and ice cracking. Modelled ambient noise levels are determined by summing the input energy of the distributions of ice cracking and pressure ridging events and correcting for the propagation loss. Both modelled and measured spectra show that ice cracking may dominate the spring-time ambient noise to frequencies as low as 40 Hz."--abstract (page 2). Includes abstract in French. Ice Acoustic properties Arctic Ocean. Glace Propriétés acoustiques Arctique, Océan. Technical reports lcgft Rapports techniques rvmgf Defence Research Establishment Pacific, issuing body. Canada. Department of National Defence. Research and Development Branch, issuing body. Technical memorandum (Defence Research Establishment Pacific) 93-79. (CaOODSP)9.936067 PDF 1.52 MB https://publications.gc.ca/collections/collection_2024/rddc-drdc/DR52-11-11-1993-eng.pdf DREP-TM-93-79