Figure 4
From: Soundscape and ambient noise levels of the Arctic waters around Greenland
Example of noise and detector outputs for soundscape characterisation from station 26 plotted in 10-min resolution. Circles represent durations of 1 year. The position of the frequency scale bar in late August represents the start of the recording. (a, b) Daily median third octave levels (TOLs) are colour-coded relative to amplitude and shown for the third octave bands each centred at frequencies between 10 and 400 Hz (a) and over the full range from 10 Hz to 12.5 kHz (b) on a logarithmic axis. (c) Seismic survey detections are shown as the median frequency content (< 1.5 kHz) of the detected events. (d) The median spectral content for all transients detected. (e) The contours for all detected low-frequency tonal signals (moans, < 1500 Hz) are plotted on top of each other and colour-coded as number of signals overlapping in each frequency bin (5.86 Hz width). (f) The contours for all detected high-frequency tonal signals (whistles, 1500–16,384 Hz) are plotted on top of each other and colour-coded as number of signals overlapping in each frequency bin (32 Hz width).
