Abstract
The open ocean is not a quiet place, particularly in the Northern Hemisphere. The soundscape of a local environment is defined as detailed understanding of the noise sources observed in time, frequency and space. In this paper we present a set of models and observations of the open ocean sound field utilizing the long-term observations from the Comprehensive Test Ban Treaty Organization (CTBTO) of the United Nations. This system of axial hydrophones spanning the globe in remote locations provides a treasure chest of data for looking at low frequency sound. For frequencies below 125 Hz, half the CTBTO sample rate, the sound field is dominated by local and distant ships, local wind, marine mammals, seismic surveying and seismic events. A basin wide model, with the Parabolic Equation model for propagation, will be presented using Satellite AIS data, surface wind fields and some estimates of fin whale distributions and seismic surveys. The science questions to be addressed are: Can we observe the wind noise or is shipping to dominant? What mechanisms explain wind noise below 50 Hz? Can we use data to move towards a better model for surface shipping source levels? Can we evaluate Fin Whale distributions from regular recordings?
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