Acoustic Scattering Kernels from Arctic Sea Ice.

• Main Author: Rubenstein,David
• Other Authors: SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA
• Format: Text
• Language: English
• Published: 1986
• Subjects: Snow; Ice and Permafrost; Acoustics; *ACOUSTIC SCATTERING; *SEA ICE; ALGORITHMS; ANGLES; SURFACE ROUGHNESS; TOPOGRAPHY; KERNEL FUNCTIONS; INCOHERENT SCATTERING; UNDERWATER ACOUSTICS; TRANSMISSION LOSS; ARCTIC REGIONS; ACOUSTIC REFLECTION; RIDGES; GRAZING; ACOUSTIC CHANNELS; UNDERICE; Ice keels; Grazing angles; Scattering loss; Underice surfaces; Mathieu function; Arctic; Mathieu; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA174235; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA174235

A new algorithm for computing scattering kernels from Artic ice keels is described. The basic equations are adapted from Burke and Twersky (1966) but the algorithm does not involve approximations in the limits of low or high frequencies, and is therefore more accurate. Calculations over a range of frequencies and grazing angles are presented. An important result is obtained. At high frequencies (greater than 200 hz) a significant component of the incoherent scattered energy is directed into shallow propagation angles (less than 15 degrees). This component must be accounted for in estimates of scattering loss.