Meghan Hodges
Underwater noise pollution refers to the increase in ocean noise levels due to human activities such as shipping, recreational boating, and energy exploration. Sound is essential for marine wildlife, as they depend on it for critical activities like breeding, foraging, and avoiding predators. However, human-made noises like propeller cavitation from ships, sonar devices, and construction can interfere with these natural processes, altering the behaviour of marine mammals, affecting their hearing, causing stress, and even leading to death. Addressing underwater noise pollution is crucial for the protection and conservation of marine ecosystems and species.
| Characteristics | Values |
|---|---|
| Definition | Noise pollution in the ocean or underwater noise |
| Sources | Ships, naval sonar devices, drilling, seismic airguns, construction noise |
| Impact | Hinders marine animals' ability to communicate, locate mates, find food, navigate, and avoid predators; causes stress, hearing loss, and death |
| Affected Animals | Whales, dolphins, porpoises, seals, walruses, fish, invertebrates |
| Mitigation Strategies | Slower ship speeds, quieting technology, ending seismic surveys, transitioning to renewable energy sources |
| Organizations | WWF, OceanCare, NOAA Fisheries, IUCN SSC-WCPA Marine Mammal Protected Areas Task Force, Whale and Dolphin Conservation |
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What You'll Learn
- Human activities like shipping, boating, and energy exploration are major causes
- Sound is critical for marine life communication and survival
- Naval sonar devices are the loudest source of underwater noise
- The search for oil and gas using seismic airguns is harmful
- Reducing ship speeds can lower underwater noise pollution
Human activities like shipping, boating, and energy exploration are major causes
Human activities like shipping, boating, and energy exploration are major contributors to underwater noise pollution. Marine mammals and other aquatic animals have evolved to rely on underwater sounds for communication, navigation, and foraging. However, the increasing human-made noise from these activities is causing detrimental effects on marine life and ecosystems.
Shipping is a significant source of underwater noise pollution. Large vessels and cargo ships produce low-frequency engine noise, hull vibrations, and propeller cavitation that can travel long distances and significantly increase noise levels in coastal and offshore habitats. These sounds can interfere with the communication and navigation of marine animals, particularly those that depend on echolocation, such as whales and dolphins.
Recreational boating and fishing also contribute to localized noise pollution in the ocean. Motors, depth finders, and other devices used in these activities add to the overall noise levels, disrupting the natural acoustic environment of marine species.
Energy exploration, including oil and gas exploration, is another major source of underwater noise pollution. Seismic airguns used to find underwater oil reserves release high-frequency sound blasts that can be detrimental to marine life. Additionally, sonar technology employed by navy vessels in search of new energy sources emits sounds that penetrate deep into the ocean, affecting marine mammals' hearing and behaviour.
Underwater construction and infrastructure development further exacerbate noise pollution in the ocean. Pile driving for bridges, wind farms, and ports, as well as the construction of new infrastructure, create noises that can alter the behaviour of marine mammals and disrupt their feeding and communication patterns.
The cumulative impact of these human activities on underwater noise levels has led to growing recognition of the issue and efforts to address it. Organisations like the World Wide Fund for Nature (WWF) are working with international bodies to develop and implement regulations to reduce underwater noise pollution and protect marine life.
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Sound is critical for marine life communication and survival
Marine animals use sound for essential activities such as breeding, foraging, maintaining social structure, and avoiding predators. For example, cetaceans (whales, dolphins, and porpoises) send and receive complex sounds to communicate with each other, navigate the water, find food, and more. Fish and invertebrates also use sound for these basic life functions.
Underwater sound is also essential for marine animals to locate mates and prey, defend their territories, and guide their navigation. For instance, blue and fin whales make sounds to find mates over hundreds of kilometres. Similarly, many coastal Indigenous Peoples depend on these animals, so there is an urgent need to understand the impacts of noise pollution on them.
However, human activities such as shipping, recreational boating, and energy exploration have increased noise levels in coastal and offshore habitats. Noise from these activities can travel long distances underwater, disrupting the natural behaviour of marine mammals and other aquatic animals. For example, sonar from navy vessels searching for oil and gas sources can alter the feeding behaviour of endangered blue whales and cause them to move away from their habitat.
Noise pollution can also interfere with acoustic signals in the marine environment, reducing the ability of animals to communicate with potential mates, other group members, their offspring, or feeding partners. It can also cause stress, disrupt feeding, hinder mother-calf communication, and frighten off fish, their main prey. Therefore, it is essential to reduce underwater noise pollution to protect marine life and ecosystems.
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Naval sonar devices are the loudest source of underwater noise
Underwater noise pollution refers to the sounds produced by human activities that penetrate deep into the ocean, causing noise levels in coastal and offshore habitats to rise. Marine mammals and other aquatic animals rely on sound as a primary means of communication and assessing their environment. They use sound to find prey, locate mates and offspring, avoid predators, guide their navigation, and locate habitats.
The use of naval sonar has been linked to harmful effects on marine life. Studies have shown that even moderate noise levels can impact the hearing of fish and reduce the viability of fish eggs. In one instance, hundreds of dead fish appeared in Lake Washington after 240 dB airgun blasts were used to test for earthquake faults. Additionally, low-frequency active (LFA) sonar has been associated with whale strandings. For example, in 1996, NATO exercises in the Mediterranean involving LFA sonar correlated with a stranding of beaked whales. Simmonds and Lopez-Jurado also noted an association between whale strandings in the Canary Islands and the presence of naval fleets.
The loud sounds produced by naval sonar can cause direct tissue damage in marine animals. Shock waves from intense underwater sound sources can lead to hemorrhage in the lungs and ulceration of the gastrointestinal tract. It can also initiate the growth of stabilized microbubbles in mammalian tissue, which can block capillaries and lead to pathological conditions. The US Navy's Low-Frequency Active Sonar (LFA sonar) is of particular concern, with the potential to kill, deafen, and disorient whales, dolphins, and other marine life. The US Navy planned to deploy LFA sonar at 240 decibels in 80% of the world's oceans to detect quiet submarines.
To address the issue of underwater noise pollution from naval sonar, organizations like the WWF are advocating for mandatory regulations and working with international bodies to predict noise levels, understand impacts, and create plans to reduce noise effects through operational and technological changes.
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The search for oil and gas using seismic airguns is harmful
Marine animals have evolved over millions of years to use sound as the primary means of communication and assessing their environment. Sound plays an essential role in critical activities for marine species, like breeding, foraging, maintaining social structure, and avoiding predators. For instance, marine mammals use underwater clicks, whistles, and songs to communicate with their young, search for food, find mates, and avoid dangers.
However, human activities such as shipping, recreational boating, and energy exploration have increased noise levels in many coastal and offshore habitats. These rising noise levels can negatively impact ocean animals and ecosystems. Higher noise levels can reduce the ability of animals to communicate with potential mates, other group members, their offspring, or feeding partners.
The search for oil and gas using seismic airguns is one of the major contributors to underwater noise pollution. Seismic surveys involve blasting the seafloor with high-powered airguns, a kind of powerful horn, every 10 seconds and measuring the echoes to map offshore oil and gas reserves. These blasts can reach more than 250 decibels and are audible for miles.
The noise from these airguns can disturb, injure, or even kill marine animals, from zooplankton, the base of the food web, to large whales. It can cause hearing loss, disrupt essential behaviors like feeding and breeding, and mask communications between individual whales and dolphins. The blasts also reduce catch rates for commercial fish.
The use of seismic airguns for oil and gas exploration is harmful to marine life and can have long-term impacts on marine ecosystems. It is important to explore alternative methods of energy exploration that do not have such detrimental effects on the environment. Organizations like the WWF and NOAA Fisheries are working towards regulating and reducing underwater noise pollution to protect marine life.
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Reducing ship speeds can lower underwater noise pollution
Marine mammals and other aquatic animals have evolved to use sound as the primary means of communication and assessing their environment. They use underwater clicks, whistles, and songs to communicate with their young, search for food, find mates, and avoid dangers. However, human activities such as shipping, recreational boating, and energy exploration have increased noise levels in the ocean, negatively impacting marine life. Noise from ships can affect marine mammals by disrupting foraging, nursing, resting, and social interactions. It can also cause elevated stress levels, lower resilience, and impact reproduction and immunity.
To address this issue, reducing ship speeds has been identified as an effective noise mitigation measure. Studies have shown that even small reductions in cargo vessel speed can substantially reduce noise impacts on marine life. Slower ships emit less noise, and this effect is more pronounced in deeper waters where noise can propagate over larger distances. For each 1-knot reduction in speed, a ship's noise level decreases by 1 decibel. This means that slowing the global fleet by just 10% could reduce total sound energy from shipping by up to 40%.
The Vancouver-Fraser Port Authority in British Columbia, for example, implemented a measure asking ships to slow down to either 11 or 14.5 knots as they approached the port to reduce noise disturbance to the endangered Southern Resident orca population. This initiative resulted in an impressive 55% decrease in underwater sound intensity in the area. Additionally, a study in the Western Mediterranean Sea found that limiting shipping speed reduced underwater shipping noise, with deeper waters enhancing the effectiveness of this measure.
While reducing ship speeds is a simple and effective way to lower underwater noise pollution, it is important to note that other measures are also necessary. These include re-routing shipping traffic to avoid sensitive areas, technological modifications to reduce vessel noise, and the retirement of older, noisier vessels. By combining these strategies, we can work towards reducing the harmful impacts of underwater noise pollution on marine life and ecosystems.
In conclusion, reducing ship speeds is a significant step towards lowering underwater noise pollution. By implementing this measure, along with other noise reduction strategies, we can help mitigate the negative consequences of human activities on marine life and promote healthier and more resilient ocean ecosystems.
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Frequently asked questions
Underwater noise pollution refers to the increase in ocean noise levels caused by human activities such as shipping, boating, and energy exploration. These activities can interfere with the ability of marine animals to communicate and survive.
Marine mammals and other aquatic animals have evolved to rely on sound as a primary means of communication and assessing their environment. Underwater noise pollution can disrupt their natural behaviour, causing them to move away from their habitats, increase their anti-predatory behaviour, and hinder their ability to locate mates and prey. It can also cause stress, hearing loss, and even death.
The sources of underwater noise pollution include propeller cavitation from shipping, sonar from navy vessels, construction noise, and seismic airguns used for oil and gas exploration.
Efforts to reduce underwater noise pollution include advocating for mandatory regulations, implementing quieting technology in ship design, transitioning to low-noise renewable energy sources, and reducing the speed of ships. Organizations such as WWF and OceanCare are working towards these goals through research, collaboration, and campaigning.
