Acoustic Masking
Low-frequency shipping noise propagates across entire ocean basins, operating in the same 10-1000 Hz bands used by baleen whales. This acoustic smog reduces the range over which whales can communicate by an order of magnitude compared to pre-industrial levels.
Data & Modeling
| Source | Source Level (dB re 1 µPa @ 1m) | Frequency Range |
|---|---|---|
| Commercial Ship | 170 - 190 | 10 - 1000 Hz |
| Seismic Airgun | 230 - 260 | 10 - 300 Hz |
| Military Sonar | >230 | 1 - 10 kHz |
Common Misconceptions
A frequent error in media interpretation is confusing localized transient effects with global secular trends. The figures demonstrated here isolate the multi-decadal signal from seasonal noise.
Frequently Asked Questions
Is this reversible?
On human timescales, highly unlikely. The thermal inertia of the ocean means impacts will persist for centuries even if emissions cease immediately.
How accurate are these figures?
Based on the latest AR6 synthesis and prevailing primary literature. Uncertainties are inherent in coupled non-linear climate models.