Helena Joyce
Marine animals have evolved over millions of years to use underwater sound as a primary means of communication and survival. However, human activities such as commercial shipping, sonar equipment, seismic surveys, and construction have led to rising noise pollution in the ocean, endangering marine life and ecosystems. This noise pollution interferes with the critical activities of marine species, including breeding, foraging, and navigating, causing behavioural changes and even death. As noise levels increase, understanding and addressing the impact of human-produced noise on the ocean environment becomes crucial for the conservation and recovery of marine life.
| Characteristics | Values |
|---|---|
| Human activities causing noise pollution in the ocean | Commercial shipping, industrial fishing, shipping, construction, oil drilling, seismic surveys, warfare, sea-bed mining, sonar-based navigation, marine dredging, military sonars and explosions, recreational boating, energy exploration, terrestrial traffic |
| Impact on marine life | Interference with the detection of acoustic signals, changes in individual and social behaviour, altered metabolisms, hampered population recruitment, hearing loss, distress to marine animals both physiologically and behaviourally, immediate damage, death |
| Solutions | Develop quieter technologies, international regulations, technological advancements, continued research and education, adoption of quieter ship designs, modifications to hull designs, use of quieter propellers, coordinated efforts from governments, industries, and conservationists |
Explore related products
What You'll Learn
Commercial shipping and boating
Shipping alone has contributed an estimated 32-fold increase in low-frequency noise along major shipping routes in the past 50 years. This has driven marine animals away from vital breeding and feeding grounds, causing them to change their vocal behaviour. For example, increased ship noise has caused bottlenose dolphins to simplify their vocal calls, potentially reducing the effectiveness of their communication.
Cargo vessels produce very low-frequency sounds that may travel hundreds of kilometres underwater. As global shipping operates day and night, the constant drone masks the natural soundtrack of the sea and interferes with important biological and ecological processes over vast distances. The loud, continuous noises from shipping can distress marine animals both physiologically and behaviourally. For instance, sounds from shipping lanes can reach 190 decibels, comparable to the roar of a jet engine, and have been recorded to cause whales to abandon their critical feeding grounds.
To mitigate the impact of commercial shipping and boating on ocean noise pollution, several solutions have been proposed. The International Maritime Organization (IMO) has established guidelines encouraging the adoption of quieter ship designs. These measures include modifications to hull designs and the use of quieter propellers, which can significantly reduce the noise levels generated by vessels. Additionally, policies can be implemented to reduce propeller noise from ships and regulate the use of sonar equipment.
Soil Pollution: Understanding the Contaminants in Our Soil
You may want to see also
Explore related products
Oil and gas exploration
The noise created by these air guns directly impacts marine life by interfering with underwater species' communications and behaviour. For example, noise pollution has been observed to cause changes in the calling behaviour of whales and dolphins, which rely on echolocation to navigate, find food, and communicate. In some cases, noise pollution has led to fatal injuries in marine animals, similar to those seen in many strandings around the world.
Air guns used for oil and gas exploration can be loud enough to affect humpback whales up to 3 kilometres away, potentially altering their migration patterns. The noise from these air guns has also been found to deter humpback whales from their migration routes. This disruption to whale behaviour is not limited to a single species, as noise pollution has been observed to affect various whale and dolphin species, including toothed whales, bottlenose dolphins, and porpoises.
In addition to the use of air guns, other human activities associated with oil and gas exploration contribute to noise pollution in the ocean. Drilling, the placement of offshore structures, and production activities on the continental shelf generate significant underwater noise. The machinery, propellers, and thrusters used in these processes can produce sound levels of up to 135 dB re 1 µPa @ 1 m and intensity peaking at 40 to 100 Hz.
To reduce the impact of oil and gas exploration on marine life, it is crucial to develop and implement quieter technologies and stricter regulations. Mitigating the sounds of equipment, such as sonar and seismic air guns, is essential for minimizing the harmful effects of noise pollution on the ocean's ecosystems and its inhabitants.
How Eco-Friendly is TNT?
You may want to see also
Explore related products
Military sonar and seismic surveys
Seismic surveys are another human activity that generates noise pollution in the ocean. Oil and gas industries use seismic air guns to search for potential gas and oil spots on the seafloor. These air guns produce low-frequency sounds that can extend for up to 4,000 kilometres and last from seconds to days or even months. The continuous blasts of sound from seismic air guns directly interfere with the communications of underwater species, impacting their behaviour and the regularity of their sightings near shores. Seismic surveys have also been found to disrupt the migration routes of fish, leading to population declines and affecting commercial fisheries.
The extremely powerful sound waves generated by military sonar and seismic surveys can cause direct physical harm to marine mammals. For animals that rely on echolocation, such as dolphins and toothed whales, excessive noise can disrupt their signals, causing disorientation and impairing their ability to hunt successfully. Noise pollution can also trigger stress responses in fish, disturb nesting habits, affect coordination and navigation, and damage their hearing. In some cases, the loud noises from military sonar and seismic surveys may cause haemorrhaging to the heart and brain within a few hours of exposure.
To mitigate the impact of military sonar and seismic surveys on marine life, it is essential to reduce noise at its source. Quieter technologies, such as "marine vibroseis" in seismic surveys, can be used as an alternative to airguns. Additionally, better maintenance and optimisation of propeller design in ships, as well as slowing down vessels, can help reduce noise levels. However, the adoption of noise-reducing solutions often faces reluctance due to the time and resources required. Creating international regulations and frameworks for noise pollution, such as those being pursued by the United Nations, could help enforce mandatory noise mitigation measures and protect marine biodiversity.
Urban Pollution: Cities' Environmental Impact
You may want to see also
Explore related products
Marine dredging and construction
The continuous use of machinery and transport during marine construction projects emits loud noises at low frequencies, negatively impacting the ocean's flora and fauna. Construction noise can drive marine animals away from vital breeding and feeding grounds, reducing their population and undermining conservation efforts. Additionally, the installation of oil rig platforms and other offshore structures contributes to underwater noise pollution, with drilling machinery and propellers generating sounds that can reach up to 135 dB re 1µPa @ 1 m and intensities of 40 to 100 Hz.
The impact of construction noise on marine life was evident during the COVID-19 lockdown in April 2020, when a 20% reduction in human-caused ocean noise resulted in marine life returning to once-busy waterways. This highlights the immediate positive effect of reducing anthropogenic noise in the marine environment. To mitigate the impact of construction and dredging activities on marine life, various technical solutions are available, such as wind-powered ships, noise-reducing propellers, floating wind turbines, and "bubble curtains" to muffle construction noise.
It is important to note that while construction and dredging activities can have significant acoustic impacts, the cumulative effect of multiple human activities is also a concern. The noise generated by these projects adds to the existing noise pollution from shipping, sonar equipment, seismic air guns, and other human activities in the ocean. This cumulative noise pollution can have far-reaching consequences for marine life, especially in well-travelled routes and coastal areas.
Overall, marine dredging and construction activities are significant contributors to ocean noise pollution, and efforts to reduce noise emissions and develop quieter technologies are crucial for protecting marine ecosystems and the animals that rely on sound for survival.
Flatulent Dupes: Polluted Oxygen's Unseen Culprits?
You may want to see also
Explore related products
Seismic air guns
The use of seismic air guns has a direct and negative impact on marine life. The loud, low-frequency sounds interfere with the acoustic levels and frequencies in the ocean, disrupting the communication of underwater species. The noise can extend up to 2,500-4,000 km and blasts can last from seconds to days or even months, with blasts being repeated as often as every 10 seconds. This noise pollution can cause marine animals to change their behaviour, including their feeding, mating, and communication patterns. It can also lead to hearing loss in marine animals, with species that have more sensitive hearing showing more significant effects.
Studies have shown that humpback whales deviated from their predicted heading and decreased their swim speeds when exposed to seismic air gun noise. Atlantic spotted dolphins exhibited a significant, short-term avoidance response to airguns within approximately 1 km of the source. In contrast, sperm whales showed no change in behaviour when exposed to seismic air gun surveys in the Gulf of Mexico.
Noise pollution from seismic air guns can also have economic impacts, as it has been linked to reduced fish catches and lower catch rates for fish. This type of pollution can also affect the health and service functions of marine ecosystems, including the behaviour and metabolism of marine species.
To mitigate the negative impacts of seismic air guns, policies and quieter technologies are needed to reduce the noise produced by these devices. By improving the ocean soundscape, we can potentially enable the recovery of some marine life and reduce the harmful effects of noise pollution on marine ecosystems.
Cows and Climate Change: Environmental Impact
You may want to see also
Frequently asked questions
Some human activities that cause noise pollution in the ocean include commercial shipping, industrial fishing, seismic surveys, sonar equipment, and construction.
Cargo vessels produce very low-frequency sounds that may travel hundreds of kilometres underwater. As shipping runs day and night, the constant drone masks the natural soundtrack of the sea and interferes with the biological and ecological processes of marine life.
Increased ship noise has caused bottlenose dolphins to simplify their vocal calls, reducing the information content of their calls and decreasing effective communication. Whales have also abandoned their critical feeding grounds due to loud shipping noises, depriving them of essential nutrients and threatening their survival.
Noise pollution can interfere with the detection of acoustic signals in the marine environment, reducing the ability of animals to communicate with potential mates, other group members, and their offspring. It can also reduce an ocean animal's ability to hear environmental cues that are vital for survival, such as avoiding predators, finding food, and navigating to preferred habitats.
To reduce noise pollution in the marine environment, policies should be implemented to mitigate the sounds of sonar equipment and propeller noise from ships. Quieter technologies should also be developed, such as quieter ship designs and quieter propellers, to minimise underwater noise pollution.
