Figure 3
From: Temporal patterns in the soundscape of a Norwegian gateway to the Arctic

Median power Spectrum Density (PSD) curves for each month, calculated using 1/3 octave band measurements every 30 s. The vertical dotted lines indicate the 63 and 125 Hz centered 1/3 octave bands. Note that all values remain below the 100 dB threshold defined by Erbe (2013).