Advances in ocean acoustics : proceedings of the 3rd International Conference on Ocean Acoustics (OA2012) ; Beijing China 21 25 May 2012 Unique to this volume are eighteen special reports or reviews of research progress (over the last two to three decades) covering a variety of topics including computational acoustics shallow water acoustics seafloor and sediment acoustics boundary scattering and reverberation water column effects ocean ambient noise geoacoustic inversion marine bioacoustics arctic acoustics signal processing underwater acoustic communication and underwater sound projectors. P. 1