title: Bayesian source tracking via focalization and marginalization in an uncertain Mediterranean Sea environment.
abstract: This paper applies Bayesian source tracking in an uncertain environment to Mediterranean Sea data, and investigates the resulting tracks and track uncertainties as a function of data information content (number of data time-segments, number of frequencies, and signal-to-noise ratio) and of prior information (environmental uncertainties and source-velocity constraints). To track low-level sources, acoustic data recorded for multiple time segments (corresponding to multiple source positions along the track) are inverted simultaneously. Environmental uncertainty is addressed by including unknown water-column and seabed properties as nuisance parameters in an augmented inversion. Two approaches are considered: Focalization-tracking maximizes the posterior probability density (PPD) over the unknown source and environmental parameters. Marginalization-tracking integrates the PPD over environmental parameters to obtain a sequence of joint marginal probability distributions over source coordinates, from which the most-probable track and track uncertainties can be extracted. Both approaches apply track constraints on the maximum allowable vertical and radial source velocity. The two approaches are applied for towed-source acoustic data recorded at a vertical line array at a shallow-water test site in the Mediterranean Sea where previous geoacoustic studies have been carried out.
authors.affiliation: School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada. sdosso@uvic.ca
authors.forename: Stan E
authors.initials: SE
authors.lastname: Dosso
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Wilmut
authors.forename: Peter L
authors.initials: PL
authors.lastname: Nielsen
mesh_terms: D000162:Acoustics; D001499:Bayes Theorem; D016013:Likelihood Functions; D008522:Mediterranean Sea; D008962:Models, Theoretical; D009038:Motion; D009791:Oceanography / Q000379:methods*; D011825:Radar; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D035501:Uncertainty; D014867:Water
chemical_list: D014867:Water