Arctic Under-Ice Roughness.

• Main Authors: LeSchack,Leonard A, Chang,David C
• Other Authors: DEVELOPMENT AND RESOURCES TRANSPORTATION CO SILVER SPRING MD
• Format: Text
• Language: English
• Published: 1977
• Subjects: Snow; Ice and Permafrost; Underwater and Marine Navigation and Guidance; Acoustics; *UNDERWATER ACOUSTICS; *UNDERWATER NAVIGATION; *SEA ICE; *ARCTIC OCEAN; THICKNESS; SEASONAL VARIATIONS; SUBMARINES; ROUGHNESS; SONAR TRANSDUCERS; SONAR SIGNALS; SHALLOW DEPTH; Under ice roughness; WUNR307374; Most Project-2; Arctic; Arctic Ocean; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA048690; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA048690

Under-ice profile records obtained in the Arctic Ocean during the winter 1960 cruise of the USS SARGO and the 1960 and 1962 summer cruises of the USS SEADRAGON have been digitized and the Root-Mean-Square (RMS) depths have been computed (The RMS ice depth is a valuable parameter for Arctic acoustic studies as well as a good indicator of under-ice roughness). Thirteen representative profile segments varying in length from 50-250 miles and taken from the three cruises have been statistically analyzed. This analysis suggests that during the 1960-62 period under-ice roughness varies from place to place during the same period but at a given location does not vary over time. Histograms of ice depths observed across the Arctic Ocean during the above three cruises have been plotted. From these plots it is observed that there is, for this period, 15% open water in the summer and 2% during the winter. Additionally, it is noted that the amount of ice found in each thickness class varies only a few percent between winter and the following summers. (Author)