Preliminary examination of the low-frequency ambient noise field in the South China Sea during the 2001 ASIAEX experiment
Newhall, Arthur E.
Lynch, James F.
Duda, Timothy F.
MetadataShow full item record
This correspondence presents a preliminary examination of the low frequency ambient noise field measured in the South China Sea component of the Asian Seas International Acoustics Experiment (ASIAEX), concentrating on the frequencies of 50, 100, 200, 400, 800, and 1200 Hz. A two-week-long time series of the noise at these frequencies is examined for structure in both the time and frequency domains. Three features of particular interest in these series are: 1) the noise due to a typhoon, which passed near the experimental site, 2) the weak tidal frequency variability of the noise field, which is probably due to internal tide induced variability in the propagation conditions, and 3) the vertical angle dependence of the noise, particularly as regards the shallow water "noise notch" phenomenon. The acoustic frequency dependence and the vertical dependence of the noise field are also examined over the course of the time series. A simple look at the noise variability statistics is presented. Finally, directions for further analysis are discussed.
Author Posting. © IEEE, 2004. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 29 (2004): 1308-1315, doi:10.1109/JOE.2004.836999.
Showing items related by title, author, creator and subject.
Abrupt climate change as an important agent of ecological change in the Northeast U.S. throughout the past 15,000 years Shuman, Bryan N.; Newby, Paige E.; Donnelly, Jeffrey P. (2009-03-30)We use a series of tests to evaluate two competing hypotheses about the association of climate and vegetation trends in the northeastern United States over the past 15 kyrs. First, that abrupt climate changes on the scale ...
Pendleton, Elizabeth A.; Thieler, E. Robert; Williams, S. Jeffress (Coastal Education and Research Foundation, 2010-01)In 2001, the U.S. Geological Survey began conducting scientific assessments of coastal vulnerability to potential future sea- and lake-level changes in 22 National Park Service sea- and lakeshore units. Coastal park units ...
Marine Biological Laboratory; Woods Hole Oceanographic Institution (2009)Observations show that climate warming is already having significant impacts on the ocean. How the ocean and sea ice respond will determine the trajectory of future global climate.