Overview of climatic changes and their effects on the ocean. Regional effects are displayed in italics.[1]
Overview of climatic changes and their effects on the ocean. Regional effects are displayed in italics.[1]

Among the effects of climate change on oceans are an increase of ocean temperatures, more frequent marine heatwaves, ocean acidification, a rise in sea levels, sea ice decline, increased ocean stratification, reductions in oxygen levels, changes to ocean currents including a weakening of the Atlantic meridional overturning circulation.[2] All these changes have knock-on effects which disturb marine ecosystems. The primary factor causing these changes is the Earth warming due to human-caused emissions of greenhouse gases, such as carbon dioxide and methane. This leads inevitably to ocean warming, because the ocean is taking up most of the additional heat in the climate system.[3] The ocean absorbs some of the extra carbon dioxide in the atmosphere and this causes the pH value of the ocean to drop.[4] It is estimated that the ocean absorbs about 25% of all human-caused CO2 emissions.[4]

Ocean temperature stratification increases as the ocean surface warms due to rising air temperatures.[5]: 471 The decline in mixing of the ocean layers stabilises warm water near the surface while reducing cold, deep water circulation. The reduced up and down mixing reduces the ability of the ocean to absorb heat, directing a larger fraction of future warming toward the atmosphere and land. The amount of energy available for tropical cyclones and other storms is expected to increase, while nutrients for fish in the upper ocean layers are expected to decrease, as is the ocean's capacity to store carbon.[6] At the same time, contrasts in salinity are increasing: salty areas are becoming saltier and fresher areas less salty.[7]

Warmer water cannot contain the same amount of oxygen as cold water. As a result, oxygen from the oceans moves to the atmosphere. Increased thermal stratification may result in a reduced supply of oxygen from surface waters to deeper waters, lowering the water's oxygen content further.[8] The ocean has already lost oxygen throughout its water column, and oxygen minimum zones are expanding worldwide.[5]: 471 

These changes harm marine ecosystems, which can accelerate species extinctions[9] or cause population explosions, altering species distribution.[2] This also affects coastal fishing and tourism. Rising water temperatures will also harm various oceanic ecosystems, such as coral reefs. The direct effect is coral bleaching on these reefs, which are sensitive to even minor temperature changes, so a small increase in temperature could have a significant impact in these environments. Ocean acidification and temperature rise will also affect the productivity and distribution of species within the ocean, threatening fisheries and upsetting marine ecosystems. Loss of sea ice habitats due to warming will severely impact the many polar species that rely on it. The interactions between many of these climate change factors increase pressures on the climate system and ocean ecosystems.[2]

Changes due to rising greenhouse gas levels

Ocean heat content changes since 1955 (annual estimates for the first 2,000 meters of ocean depth, the shaded blue region indicates the 95% margin of uncertainty.)[10]
Ocean heat content changes since 1955 (annual estimates for the first 2,000 meters of ocean depth, the shaded blue region indicates the 95% margin of uncertainty.)[10]
Energy (heat) added to various parts of the climate system due to global warming (data from 2007).
Energy (heat) added to various parts of the climate system due to global warming (data from 2007).

Further information: Climate change and Effects of climate change

Presently (2020), atmospheric carbon dioxide (CO2) levels of more than 410 parts per million (ppm) are nearly 50% higher than preindustrial levels. These elevated levels and rapid growth rates are unprecedented in the geological record's 55 million years.[4] The source for this excess CO2 is clearly established as human-driven, reflecting a mix of fossil fuel burning, industrial, and land-use/land-change emissions.[4] The idea that the ocean serves as a major sink for anthropogenic CO2 has been discussed in scientific literature since at least the late 1950s.[4] Several pieces of evidence point to the ocean absorbing roughly a quarter of total anthropogenic CO2 emissions.[4]

The latest key findings about the observed changes and impacts from 2019 include:

It is virtually certain that the global ocean has warmed unabated since 1970 and has taken up more than 90% of the excess heat in the climate system [...]. Since 1993, the rate of ocean warming has more than doubled [...]. Marine heatwaves have very likely doubled in frequency since 1982 and are increasing in intensity [...]. By absorbing more CO2, the ocean has undergone increasing surface acidification [...]. A loss of oxygen has occurred from the surface to 1000 m [...].

— IPCC Special Report on the Ocean and Cryosphere in a Changing Climate (2019), [2]: 9 

Rising ocean temperature

Land surface temperatures have increased faster than ocean temperatures as the ocean absorbs about 92% of excess heat generated by climate change.[11] Chart with data from NASA[12] showing how land and sea surface air temperatures have changed vs a pre-industrial baseline.
Land surface temperatures have increased faster than ocean temperatures as the ocean absorbs about 92% of excess heat generated by climate change.[11] Chart with data from NASA[12] showing how land and sea surface air temperatures have changed vs a pre-industrial baseline.

See also: Ocean temperature, Sea surface temperature, and Marine heatwave

It is clear that the ocean is warming as a result of climate change, and this rate of warming is increasing.[2]: 9  The global ocean was the warmest it had ever been recorded by humans in 2022.[13] This is determined by the ocean heat content, which exceeded the previous 2021 maximum in 2022.[13] The steady rise in ocean temperatures is an unavoidable result of the Earth's energy imbalance, which is primarily caused by rising levels of greenhouse gases.[13] Between pre-industrial times and the 2011–2020 decade, the ocean's surface has heated between 0.68 and 1.01 °C.[14]: 1214 

The upper ocean (above 700 m) is warming the fastest, but the warming trend is widespread. The majority of ocean heat gain occurs in the Southern Ocean. For example, between the 1950s and the 1980s, the temperature of the Antarctic Southern Ocean rose by 0.17 °C (0.31 °F), nearly twice the rate of the global ocean.[15]

The warming rate varies with depth: at a depth of a thousand metres the warming occurs at a rate of nearly 0.4 °C per century (data from 1981 to 2019), whereas warming occurs at only half that depth.[5]: 463 

The illustration of temperature changes from 1960 to 2019 across each ocean starting at the Southern Ocean around Antarctica.[16]
The illustration of temperature changes from 1960 to 2019 across each ocean starting at the Southern Ocean around Antarctica.[16]

Ocean heat content

The ocean temperature varies from place to place. Temperatures are higher near the equator and lower at the poles. As a result, changes in total ocean heat content best illustrate ocean warming. When compared to 1969–1993, heat uptake has increased between 1993 and 2017.[5]: 457 

Ocean heat content (OHC) is the energy absorbed and stored by oceans. Between 1971 and 2018, the rise in OHC accounts for over 90% of Earth’s excess thermal energy from global heating.[17][18] The main driver of this OHC increase was most likely anthropogenic forcing via rising greenhouse gas emissions.[19]: 1228  By 2020, about one third of the added energy had propagated to depths below 700 meters.[20][21] Ocean heat content and sea level rise are important indicators of climate change.[22] The term is used in oceanography and climatology.

Ocean water absorbs solar energy efficiently and has far greater heat capacity than atmospheric gases.[20] As a result, the top few meters of the ocean contain more thermal energy than the entire Earth's atmosphere.[23] Since before 1960, research vessels and stations have sampled sea surface temperatures and temperatures at greater depth all over the world. Furthermore, since the year 2000, an expanding network of nearly 4000 Argo robotic floats has measured temperature anomalies, or the change in OHC. OHC has been increasing at a steady or accelerating rate since at least 1990.[17][24] The net rate of change in the upper 2000 meters from 2003 to 2018 was +0.58±0.08 W/m2 (or annual mean energy gain of 9.3 zettajoules). The uncertainty is primarily due to the challenges of making multidecadal measurements with sufficient accuracy and spatial coverage.[22]

Ocean acidification

Ocean acidification: mean seawater pH. Mean seawater pH is shown based on in-situ measurements of pH from the Aloha station.[25]
Ocean acidification: mean seawater pH. Mean seawater pH is shown based on in-situ measurements of pH from the Aloha station.[25]
Change in pH since the beginning of the industrial revolution. RCP2.6 scenario is "low CO2 emissions". RCP8.5 scenario is "high CO2 emissions".[26]
Change in pH since the beginning of the industrial revolution. RCP2.6 scenario is "low CO2 emissions". RCP8.5 scenario is "high CO2 emissions".[26]

Ocean acidification is the decrease in the pH of the Earth’s ocean. Between 1950 and 2020, the average pH of the ocean surface fell from approximately 8.15 to 8.05.[27] Carbon dioxide emissions from human activities are the primary cause of ocean acidification, with atmospheric carbon dioxide (CO2) levels exceeding 410 ppm (in 2020). CO2 from the atmosphere is absorbed by the oceans. This produces carbonic acid (H2CO3) which dissociates into a bicarbonate ion (HCO−3) and a hydrogen ion (H+). The presence of free hydrogen ions (H+) lowers the pH of the ocean, increasing acidity (this does not mean that seawater is acidic yet; it is still alkaline, with a pH higher than 8). Marine calcifying organisms, such as mollusks and corals, are especially vulnerable because they rely on calcium carbonate to build shells and skeletons.[28]

A change in pH by 0.1 represents a 26% increase in hydrogen ion concentration in the world's oceans (the pH scale is logarithmic, so a change of one in pH unit is equivalent to a tenfold change in hydrogen ion concentration).[29] Sea-surface pH and carbonate saturation states vary depending on ocean depth and location. Colder and higher latitude waters are capable of absorbing more CO2. This can cause acidity to rise, lowering the pH and carbonate saturation levels in these areas. Other factors that influence the atmosphere-ocean CO2 exchange, and thus local ocean acidification, include: ocean currents and upwelling zones, proximity to large continental rivers, sea ice coverage, and atmospheric exchange with nitrogen and sulfur from fossil fuel burning and agriculture.[30][31][32]

Decreased ocean pH has a range of potentially harmful effects for marine organisms. These include reduced calcification, depressed metabolic rates, lowered immune responses, and reduced energy for basic functions such as reproduction.[33] The effects of ocean acidification are therefore impacting marine ecosystems that provide food, livelihoods, and other ecosystem services for a large portion of humanity. Some 1 billion people are wholly or partially dependent on the fishing, tourism, and coastal management services provided by coral reefs. Ongoing acidification of the oceans may therefore threaten food chains linked with the oceans.[34][35]

Effects on the physical environment

This animation helps to convey the importance of Earth's oceanic processes as one component of Earth's interrelated systems (source: NASA).

Sea level rise

Main article: Sea level rise
Waves on an ocean coast
Waves on an ocean coast

Many coastal cities will experience coastal flooding in the coming decades and beyond.[14]: 1318  Local subsidence, which may be natural but can be increased by human activity, can exacerbate coastal flooding.[36] Coastal flooding will threaten hundreds of millions of people by 2050, particularly in Southeast Asia.[36]

Between 1901 and 2018, the average global sea level rose by 15–25 cm (6–10 in), or 1–2 mm per year.[37] This rate is increasing; sea levels are now rising at a rate of 3.7 mm (0.146 inches) per year.[38] Human-caused climate change is predominantly the cause, as it constantly heats (and thus expands) the ocean and melts land-based ice sheets and glaciers.[39] Between 1993 and 2018, thermal expansion of water contributed 42% to sea level rise (SLR); melting of temperate glaciers contributed 21%; Greenland contributed 15%; and Antarctica contributed 8%.[40]: 1576  Because sea level rise lags changes in Earth temperature, it will continue to accelerate between now and 2050 purely in response to already-occurring warming;[41] whether it continues to accelerate after that depends on human greenhouse gas emissions. If global warming is limited to 1.5 °C (2.7 °F), then sea level rise does not accelerate, but it would still amount to 2–3 m (7–10 ft) over the next 2000 years, while 19–22 metres (62–72 ft) would occur if the warming peaks at 5 °C (9.0 °F).[38]: 21 

Changing ocean currents

Main articles: Ocean § Ocean currents and global climate, and Atlantic meridional overturning circulation

Ocean currents are caused by temperature variations caused by sunlight and air temperatures at various latitudes, as well as prevailing winds and the different densities of salt and fresh water. Warm air rises near the equator. Later, as it moves toward the poles, it cools again. Cool air sinks near the poles, but warms and rises again as it moves toward the equator. This produces Hadley cells, which are large-scale wind patterns, with similar effects driving a mid-latitude cell in each hemisphere.[42][page needed] Wind patterns associated with these circulation cells drive surface currents which push the surface water to higher latitudes where the air is colder.[42][page needed] This cools the water, causing it to become very dense in comparison to lower latitude waters, causing it to sink to the ocean floor, forming North Atlantic Deep Water (NADW) in the north and Antarctic Bottom Water (AABW) in the south.[43]

Driven by this sinking and the upwelling that occurs in lower latitudes, as well as the driving force of the winds on surface water, the ocean currents act to circulate water throughout the sea. When global warming is factored in, changes occur, particularly in areas where deep water is formed.[44] As the oceans warm and glaciers and polar ice caps melt, more and more fresh water is released into the high latitude regions where deep water forms, lowering the density of the surface water. As a result, the water sinks more slowly than it would normally.[44]

The Atlantic Meridional Overturning Circulation (AMOC) may have weakened since the preindustrial era, according to modern observations and paleoclimate reconstructions (the AMOC is part of a global thermohaline circulation), but there is too much uncertainty in the data to know for certain.[14]: 1237  Climate change projections assessed in 2021 indicate that the AMOC is very likely to weaken over the course of the 21st century.[14]: 1214  A weakening of this magnitude could have a significant impact on global climate, with the North Atlantic being particularly vulnerable.[2]: 19 

Any changes in ocean currents affect the ocean's ability to absorb carbon dioxide (which is affected by water temperature) as well as ocean productivity because the currents transport nutrients (see Impacts on phytoplankton and net primary production). Because the AMOC deep ocean circulation is slow (it takes hundreds to thousands of years to circulate the entire ocean), it is slow to respond to climate change.[45]: 137 

Increasing stratification

Main articles: Ocean stratification and Ocean § Physical properties
Drivers of hypoxia and ocean acidification intensification in upwelling shelf systems. Equatorward winds drive the upwelling of low dissolved oxygen (DO), high nutrient, and high dissolved inorganic carbon (DIC) water from above the oxygen minimum zone. Cross-shelf gradients in productivity and bottom water residence times drive the strength of DO (DIC) decrease (increase) as water transits across a productive continental shelf.[46][47]
Drivers of hypoxia and ocean acidification intensification in upwelling shelf systems. Equatorward winds drive the upwelling of low dissolved oxygen (DO), high nutrient, and high dissolved inorganic carbon (DIC) water from above the oxygen minimum zone. Cross-shelf gradients in productivity and bottom water residence times drive the strength of DO (DIC) decrease (increase) as water transits across a productive continental shelf.[46][47]

Changes in ocean stratification are significant because they can influence productivity and oxygen levels. The separation of water into layers based on density is known as stratification. Stratification by layers occurs in all ocean basins. The stratified layers limit how much vertical water mixing takes place, reducing the exchange of heat, carbon, oxygen and particles between the upper ocean and the interior.[48] Since 1970, there has been an increase in stratification in the upper ocean due to global warming and, in some areas, salinity changes.[14] The salinity changes are caused by evaporation in tropical waters, which results in higher salinity and density levels. Meanwhile, melting ice can cause a decrease in salinity at higher latitudes.[14]

Temperature, salinity and pressure all influence water density. As surface waters are often warmer than deep waters, they are less dense, resulting in stratification.[48] This stratification is crucial not just in the production of the Atlantic Meridional Overturning Circulation, which has worldwide weather and climate ramifications, but it is also significant because stratification controls thee movement of nutrients from deep water to the surface. This increases ocean productivity and is associated with the compensatory downward flow of water that carries oxygen from the atmosphere and surface waters into the deep sea.[45]

Reduced oxygen levels

Main article: Ocean deoxygenation
Global map of low and declining oxygen levels in the open ocean and coastal waters. The map indicates coastal sites where anthropogenic nutrients have resulted in oxygen declines to less than 2 mg L–1 (red dots), as well as ocean oxygen minimum zones at 300 metres (blue shaded regions).[49]
Global map of low and declining oxygen levels in the open ocean and coastal waters. The map indicates coastal sites where anthropogenic nutrients have resulted in oxygen declines to less than 2 mg L–1 (red dots), as well as ocean oxygen minimum zones at 300 metres (blue shaded regions).[49]

Climate change has an impact on ocean oxygen, both in coastal areas and in the open ocean.[49]

The open ocean naturally has some areas of low oxygen, known as oxygen minimum zones. These areas are isolated from the atmospheric oxygen by sluggish ocean circulation. At the same time, oxygen is consumed when sinking organic matter from surface waters is broken down. These low oxygen ocean areas are expanding as a result of ocean warming which both reduces water circulation and also reduces the oxygen content of that water, while the solubility of oxygen declines as the temperature rises.[50]

Overall ocean oxygen concentrations are estimated to have declined 2% over 50 years from the 1960s.[50] The nature of the ocean circulation means that in general these low oxygen regions are more pronounced in the Pacific Ocean. Low oxygen represents a stress for almost all marine animals. Very low oxygen levels create regions with much reduced fauna. It is predicted that these low oxygen zones will expand in future due to climate change, and this represents a serious threat to marine life in these oxygen minimum zones.[2]  

The second area of concern relates to coastal waters where increasing nutrient supply from rivers to coastal areas leads to increasing production and sinking organic matter which in some coastal regions leads to extreme oxygen depletion, sometimes referred to as dead zones.[51] These dead zones are expanding driven particularly by increasing nutrient inputs, but also compounded by increasing ocean stratification driven by climate change.[2]

Changes to Earth's weather system and wind patterns

Further information: Effects of climate change on the water cycle

Climate change and the associated warming of the ocean will lead to widespread changes to the Earth's climate and weather system including increased tropical cyclone and monsoon intensities and weather extremes with some areas becoming wetter and others drier.[14] Changing wind patterns are predicted to increase wave heights in some areas.[52][14]: 1310 

Intensifying tropical cyclones

Human-induced climate change "continues to warm the oceans which provide the memory of past accumulated effects".[53] The result is a higher ocean heat content and higher sea surface temperatures. In turn, this "invigorates tropical cyclones to make them more intense, bigger, longer lasting and greatly increases their flooding rains".[53] One example is Hurricane Harvey in 2017.[53]

North Atlantic tropical cyclone activity according to the Power Dissipation Index, 1949–2015. Sea surface temperature has been plotted alongside the PDI to show how they compare. The lines have been smoothed using a five-year weighted average, plotted at the middle year.
North Atlantic tropical cyclone activity according to the Power Dissipation Index, 1949–2015. Sea surface temperature has been plotted alongside the PDI to show how they compare. The lines have been smoothed using a five-year weighted average, plotted at the middle year.

Climate change can affect tropical cyclones in a variety of ways: an intensification of rainfall and wind speed, a decrease in overall frequency, an increase in the frequency of very intense storms and a poleward extension of where the cyclones reach maximum intensity are among the possible consequences of human-induced climate change.[54] Tropical cyclones use warm, moist air as their source of energy or "fuel". As climate change is warming ocean temperatures, there is potentially more of this fuel available.[55]

Between 1979 and 2017, there was a global increase in the proportion of tropical cyclones of Category 3 and higher on the Saffir–Simpson scale. The trend was most clear in the North Atlantic and in the Southern Indian Ocean. In the North Pacific, tropical cyclones have been moving poleward into colder waters and there was no increase in intensity over this period.[56] With 2 °C (3.6 °F) warming, a greater percentage (+13%) of tropical cyclones are expected to reach Category 4 and 5 strength.[54] A 2019 study indicates that climate change has been driving the observed trend of rapid intensification of tropical cyclones in the Atlantic basin. Rapidly intensifying cyclones are hard to forecast and therefore pose additional risk to coastal communities.[57]

Salinity changes

Further information: Ocean § Salinity, and Effects of climate change on the water cycle

Due to global warming and increased glacier melt, thermohaline circulation patterns may be altered by increasing amounts of freshwater released into oceans and, therefore, changing ocean salinity. Thermohaline circulation is responsible for bringing up cold, nutrient-rich water from the depths of the ocean, a process known as upwelling.[58]

Seawater consists of fresh water and salt, and the concentration of salt in seawater is called salinity. Salt does not evaporate, thus the precipitation and evaporation of freshwater influences salinity strongly. Changes in the water cycle are therefore strongly visible in surface salinity measurements, which has been known since the 1930s.[7][59]

The long term observation records show a clear trend: the global salinity patterns are amplifying in this period.[60][61] This means that the high saline regions have become more saline, and regions of low salinity have become less saline. The regions of high salinity are dominated by evaporation, and the increase in salinity shows that evaporation is increasing even more. The same goes for regions of low salinity that are becoming less saline, which indicates that precipitation is becoming more intensified.[62][5]

Sea ice decline and changes

Decline in arctic sea ice extent (area) from 1979 to 2022
Decline in arctic sea ice extent (area) from 1979 to 2022

Sea ice decline occurs more in the Arctic than in Antarctica, where it is more a matter of changing sea ice conditions.

Sea ice in the Arctic has declined in recent decades in area and volume due to climate change. It has been melting more in summer than it refreezes in winter. Global warming, caused by greenhouse gas forcing is responsible for the decline in Arctic sea ice. The decline of sea ice in the Arctic has been accelerating during the early twenty‐first century, with a decline rate of 4.7% per decade (it has declined over 50% since the first satellite records).[63][64][65] It is also thought that summertime sea ice will cease to exist sometime during the 21st century.[66]
Sea ice extent in Antarctica varies a lot year by year. This makes it difficult determine a trend, and record highs and record lows have been observed between 2013 and 2023. The general trend since 1979, the start of the satellite measurements, has been roughly flat. Between 2015 and 2023, there has been a decline in sea ice, but due to the high variability, this does not correspond to a significant trend.[67] The flat trend is in contrast with Arctic sea ice, which has seen a declining trend.[67][68]

Time scales

Many ocean-related elements of the climate system respond slowly to warming. For instance, acidification of the deep ocean will continue for millennia, and the same is true for the increase in ocean heat content.[69]: 43  Similarly, sea level rise will continue for centuries or even millennia even if greenhouse gas emissions are brought to zero, due to the slow response of ice sheets to warming and the continued uptake of heat by the oceans, which expand when warmed.[69]: 77 

Impacts on marine life

Examples of projected impacts and vulnerabilities for fisheries associated with climate change
Examples of projected impacts and vulnerabilities for fisheries associated with climate change

Climate change will not only alter the overall productivity of the ocean, but it will also alter the structure of the ocean's biomass community. In general, species are expected to move towards the poles as a result. Some species have already moved hundreds of kilometres since the 1950s. Phytoplankton bloom timings are also already altering moving earlier in the season particularly in polar waters. These trends are projected to intensify with further progress of climate change.[14][failed verification]

There are additional potentially important impacts of climate change on seabirds, fish and mammals in polar regions where populations with highly specialised survival strategies will need to adapt to major changes in habitat and food supply. In addition, sea ice often plays a key role in their life cycle. In the Arctic for example, providing haul-out sites for seals and walruses, and for hunting routes for polar bears. In the Antarctic, sea bird and penguin distributions are also believed to be very sensitive to climate change, although the impacts to date vary in different regions.[14][failed verification]

Calcifying organisms

The full ecological consequences of the changes in calcification due to ocean acidification are complex but it appears likely that many calcifying species will be adversely affected by ocean acidification.[70][71]: 413  Increasing ocean acidification makes it more difficult for shell-accreting organisms to access carbonate ions, essential for the production of their hard exoskeletal shell.[72] Oceanic calcifying organism span the food chain from autotrophs to heterotrophs and include organisms such as coccolithophores, corals, foraminifera, echinoderms, crustaceans and molluscs.[73][74]

Overall, all marine ecosystems on Earth will be exposed to changes in acidification and several other ocean biogeochemical changes.[75] Ocean acidification may force some organisms to reallocate resources away from productive endpoints in order to maintain calcification.[76] For example, the oyster Magallana gigas is recognized to experience metabolic changes alongside altered calcification rates due to energetic tradeoffs resulting from pH imbalances.[77]

Coral reefs

Further information: Coral bleaching, Coral reef, and Coral
Bleached Staghorn coral in the Great Barrier Reef.
Bleached Staghorn coral in the Great Barrier Reef.

While some mobile marine species can migrate in response to climate change, others such as corals find this much more difficult. A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed by colonies of coral polyps held together by calcium carbonate.[78] Coral reefs are important centres of biodiversity and vital to millions of people who rely on them for coastal protection, food and for sustaining tourism in many regions.[79]

Warm water corals are clearly in decline, with losses of 50% over the last 30–50 years due to multiple threats from ocean warming, ocean acidification, pollution and physical damage from activities such as fishing. These pressures are expected to intensify.[79]

The warming ocean surface waters can lead to bleaching of the corals which can cause serious damage and/or coral death. The IPCC Sixth Assessment Report in 2022 found that: "Since the early 1980s, the frequency and severity of mass coral bleaching events have increased sharply worldwide".[80]: 416  Marine heatwaves have caused coral reef mass mortalitiy.[80]: 381  It is expected that many coral reefs will suffer irreversible changes and loss due to marine heatwaves with global temperatures increasing by more than 1.5 °C.[80]: 382 

Coral bleaching occurs when thermal stress from a warming ocean results in the expulsion of the symbiotic algae that resides within coral tissues. These symbiotic algae are the reason for the bright, vibrant colors of coral reefs.[81] A 1-2°C sustained increase in seawater temperatures is sufficient for bleaching to occur, which turns corals white.[82] If a coral is bleached for a prolonged period of time, death may result. In the Great Barrier Reef, before 1998 there were no such events. The first event happened in 1998 and after that, they begun to occur more frequently. Between 2016 - 2020 there were three of them.[83]

Apart from coral bleaching, the reducing pH value in oceans is also a problem for coral reefs because ocean acidification reduces coralline algal biodiversity.[84] The physiology of coralline algal calcification determines how the algae will respond to ocean acidification.[84]

Warm water corals are clearly in decline, with losses of 50% over the last 30-50 years due to multiple threats from ocean warming, ocean acidification, pollution and physical damage from activities such as fishing, and these pressures are expected to intensify.[85][71]: 416 

The fluid in the internal compartments (the coelenteron) where corals grow their exoskeleton is also extremely important for calcification growth. When the saturation state of aragonite in the external seawater is at ambient levels, the corals will grow their aragonite crystals rapidly in their internal compartments, hence their exoskeleton grows rapidly. If the saturation state of aragonite in the external seawater is lower than the ambient level, the corals have to work harder to maintain the right balance in the internal compartment. When that happens, the process of growing the crystals slows down, and this slows down the rate of how much their exoskeleton is growing. Depending on the aragonite saturation state in the surrounding water, the corals may halt growth because pumping aragonite into the internal compartment will not be energetically favorable.[86] Under the current progression of carbon emissions, around 70% of North Atlantic cold-water corals will be living in corrosive waters by 2050–60.[87]

Ocean productivity

Further information: Ocean § Oxygen, photosynthesis and carbon cycle

The process of photosynthesis in the surface ocean releases oxygen and consumes carbon dioxide. This photosynthesis in the ocean is dominated by phytoplankton – microscopic free-floating algae. After the plants grow, bacterial decomposition of the organic matter formed by photosynthesis in the ocean consumes oxygen and releases carbon dioxide. The sinking and bacterial decomposition of some organic matter in deep ocean water, at depths where the waters are out of contact with the atmosphere, leads to a reduction in oxygen concentrations and increase in carbon dioxide, carbonate and bicarbonate.[45] This cycling of carbon dioxide in oceans is an important part of the global carbon cycle.  

The photosynthesis in surface waters consumes nutrients (e.g. nitrogen and phosphorus) and transfers these nutrients to deep water as the organic matter produced by photosynthesis sinks upon the death of the organisms. Productivity in surface waters therefore depends in part on the transfer of nutrients from deep water back to the surface by ocean mixing and currents. The increasing stratification of the oceans due to climate change therefore acts generally to reduce ocean productivity. However, in some areas, such as previously ice covered regions, productivity may increase. This trend is already observable and is projected to continue under current projected climate change.[14][failed verification] In the Indian Ocean for example, productivity is estimated to have declined over the past sixty years due to climate warming and is projected to continue.[88]

Ocean productivity under a very high emission scenario (RCP8.5) is very likely to drop by 4-11% by 2100.[5]: 452  The decline will show regional variations. For example, the tropical ocean NPP will decline more: by 7–16% for the same emissions scenario.[5]: 452  Less organic matter will likely sink from the upper oceans into deeper ocean layers due to increased ocean stratification and a reduction in nutrient supply.[5]: 452  The reduction in ocean productivity is due to the "combined effects of warming, stratification, light, nutrients and predation".[5]: 452 

Effects on fisheries

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    Fisheries are affected by climate change in many ways: marine aquatic ecosystems are being affected by rising ocean temperatures,[89] ocean acidification[90] and ocean deoxygenation, while freshwater ecosystems are being impacted by changes in water temperature, water flow, and fish habitat loss.[91] These effects vary in the context of each fishery.[92] Climate change is modifying fish distributions[93] and the productivity of marine and freshwater species. Climate change is expected to lead to significant changes in the availability and trade of fish products.[94] The geopolitical and economic consequences will be significant, especially for the countries most dependent on the sector. The biggest decreases in maximum catch potential can be expected in the tropics, mostly in the South Pacific regions.[94]: iv 

    The impacts of climate change on ocean systems has impacts on the sustainability of fisheries and aquaculture, on the livelihoods of the communities that depend on fisheries, and on the ability of the oceans to capture and store carbon (biological pump). The effect of sea level rise means that coastal fishing communities are significantly impacted by climate change, while changing rainfall patterns and water use impact on inland freshwater fisheries and aquaculture.[95] Increased risks of floods, diseases, parasites and harmful algal blooms are climate change impacts on aquaculture which can lead to losses of production and infrastructure.[94]

    Harmful algal blooms

    Further information: Harmful algal bloom

    Although the drivers of harmful algal blooms (HABs) are poorly understood, they appear to have increased in range and frequency in coastal areas since the 1980s.[2]: 16  This is the result of human induced factors such as increased nutrient inputs (nutrient pollution) and climate change (in particular the warming of water temperatures).[2]: 16  The parameters that affect the formation of HABs are ocean warming, marine heatwaves, oxygen loss, eutrophication and water pollution.[96]: 582  These increases in HABs are of concern because of the impact of their occurrence on local food security, tourism and the economy.[2]: 16 

    It is however also possible that the perceived increase in HABs globally is simply due to more severe bloom impacts and better monitoring and not due to climate change.[80]: 463 

    Marine mammals

    Some effects on marine mammals, especially those in the Arctic, are very direct such as loss of habitat, temperature stress, and exposure to severe weather. Other effects are more indirect, such as changes in host pathogen associations, changes in body condition because of predator–prey interaction, changes in exposure to toxins and CO2 emissions, and increased human interactions.[97] Despite the large potential impacts of ocean warming on marine mammals, the global vulnerability of marine mammals to global warming is still poorly understood.[98]

    Marine mammals have evolved to live in oceans, but climate change is affecting their natural habitat.[99][100][101][102] Some species may not adapt fast enough, which might lead to their extinction.[103]

    It has been generally assumed that the Arctic marine mammals were the most vulnerable in the face of climate change given the substantial observed and projected decline in Arctic sea ice. However, research has shown that the North Pacific Ocean, the Greenland Sea and the Barents Sea host the species that are most vulnerable to global warming.[98] The North Pacific has already been identified as a hotspot for human threats for marine mammals[104] and is now also a hotspot for vulnerability to global warming. Marine mammals in this region will face double jeopardy from both human activities (e.g., marine traffic, pollution and offshore oil and gas development) and global warming, with potential additive or synergetic effects. As a result, these ecosystems face irreversible consequences for marine ecosystem functioning.[98]

    Marine organisms usually tend to encounter relatively stable temperatures compared to terrestrial species and thus are likely to be more sensitive to temperature change than terrestrial organisms.[105] Therefore, the ocean warming will lead to the migration of increased species, as endangered species look for a more suitable habitat. If sea temperatures continue to rise, then some fauna may move to cooler water and some range-edge species may disappear from regional waters or experience a reduced global range.[105] Change in the abundance of some species will alter the food resources available to marine mammals, which then results in marine mammals' biogeographic shifts. Furthermore, if a species is unable to successfully migrate to a suitable environment, it will be at risk of extinction if it cannot adapt to rising temperatures of the ocean.

    Arctic sea ice decline leads to loss of the sea ice habitat, elevations of water and air temperature, and increased occurrence of severe weather. The loss of sea ice habitat will reduce the abundance of seal prey for marine mammals, particularly polar bears.[106] Sea ice changes may also have indirect effects on animal heath due to changes in the transmission of pathogens, impacts on animals' body condition due to shifts in the prey-based food web, and increased exposure to toxicants as a result of increased human habitation in the Arctic habitat.[107]

    Sea level rise is also important when assessing the impacts of global warming on marine mammals, since it affects coastal environments that marine mammal species rely on.[108]

    Polar bears

    A polar bear waiting in the Fall for the sea ice to form.
    A polar bear waiting in the Fall for the sea ice to form.
    The key danger for polar bears posed by the effects of climate change is malnutrition or starvation due to habitat loss. Polar bears hunt seals from a platform of sea ice. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.[109] Reduction in sea-ice cover also forces bears to swim longer distances, which further depletes their energy stores and occasionally leads to drowning.[110] Thinner sea ice tends to deform more easily, which appears to make it more difficult for polar bears to access seals.[111] Insufficient nourishment leads to lower reproductive rates in adult females and lower survival rates in cubs and juvenile bears, in addition to poorer body condition in bears of all ages.[112]

    Seals

    Further information: Ringed seal § Climate change
    Harp seal mother nursing pup on sea ice
    Harp seal mother nursing pup on sea ice

    Seals are another marine mammal that are susceptible to climate change.[103] Much like polar bears, some seal species have evolved to rely on sea ice. They use the ice platforms for breeding and raising young seal pups. In 2010 and 2011, sea ice in the Northwest Atlantic was at or near an all-time low and harp seals as well as ringed seals that bred on thin ice saw increased death rates.[113][114] Antarctic fur seals in South Georgia in the South Atlantic Ocean saw extreme reductions over a 20-year study, during which scientists measured increased sea surface temperature anomalies.[115]

    Dolphins

    Dolphins are marine mammals with broad geographic extent, making them susceptible to climate change in various ways. The most common effect of climate change on dolphins is the increasing water temperatures across the globe.[116] This has caused a large variety of dolphin species to experience range shifts, in which the species move from their typical geographic region to cooler waters.[117][118] Another side effect of increasing water temperatures is the increase in harmful algae blooms, which has caused a mass die-off of bottlenose dolphins.[116]

    Climate change has had a significant impact on various dolphin species. For example: In the Mediterranean, increased sea surface temperatures, salinity, upwelling intensity, and sea levels have led to a reduction in prey resources, causing a steep decline in the short-beaked common dolphin subpopulation in the Mediterranean, which was classified as endangered in 2003.[119] At the Shark Bay World Heritage Area in Western Australia, the local population of the Indo-Pacific bottlenose dolphin had a significant decline following a marine heatwave in 2011.[120] River dolphins are highly affected by climate change as high evaporation rates, increased water temperatures, decreased precipitation, and increased acidification occur.[117][121]

    Potential feedback effects

    Methane release from methane clathrate

    Rising ocean temperatures also have the potential to impact methane clathrate reservoirs located under the ocean floor sediments. These trap large amounts of the greenhouse gas methane, which ocean warming has the potential to release. However, it is currently considered unlikely that gas clathrates (mostly methane) in subsea clathrates will lead to a "detectable departure from the emissions trajectory during this century".[69]: 107 

    In 2004 the global inventory of ocean methane clathrates was estimated to occupy between one and five million cubic kilometres.[122]

    See also

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