Table 1. Summary metrics of noise level for UK monitoring regions, with data for the North Sea sites represented by the median value among the nine monitoring sites.
| Monitoring region | 63 Hz | 125 Hz | 250 Hz | 500 Hz | |
|---|---|---|---|---|---|
| Mode | Celtic Sea | 75.8 | 83.2 | 88.4 | 91.5 |
| North Sea | 90.0 | 92.0 | 94.5 | 94.3 | |
| Southern North Sea | 94.0 | 87.0 | 72.7 | 82.3 | |
| Median | Celtic Sea | 82.0 | 83.3 | 87.1 | 89.7 |
| North Sea | 90.5 | 93.6 | 95.5 | 94.6 | |
| Southern North Sea | 94.7 | 86.0 | 78.9 | 83.5 | |
| 90th percentile | Celtic Sea | 93.2 | 93.3 | 96.0 | 96.9 |
| North Sea | 100.3 | 103.5 | 103.9 | 103.3 | |
| Southern North Sea | 102.0 | 96.5 | 94.3 | 93.3 | |
| RMS level | Celtic Sea | 101.6 | 102.3 | 102.9 | 99.9 |
| North Sea | 101.8 | 103.8 | 104.5 | 104.2 | |
| Southern North Sea | 110.8 | 113.1 | 113.3 | 104.9 |
Metrics represent all data from each site (i.e. over both monitoring years where applicable). All metrics are sound pressure levels in the corresponding 1/3-octave frequency band, in units of dB re 1 μPa.