Vorticity Showing Internal Wave Beams Generated by Tidal Flow (image) American Institute of Physics Share Print E-Mail Caption Vorticity (ω) showing internal wave beams generated by tidal flow over (a) supercritical (φ > θ), (b) critical (φ = θ), and (c) subcritical (φ < θ) continental shelf slopes. The beams are denoted by the black and magenta arrows emitted from different energy sources (black and magenta points). Credit Shuqun Cai, Chinese Academy of Sciences Usage Restrictions This image may be used only with appropriate credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.