Marine heatwave

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World map showing several marine heatwaves at different locations in August and September 2023. The marine heatwave west of South America is a prominent example. Recent marine heatwaves.png
World map showing several marine heatwaves at different locations in August and September 2023. The marine heatwave west of South America is a prominent example.

A marine heatwave is a period of abnormally high sea surface temperatures (SST) compared to typical temperatures for a particular season and locale. [1] Marine heatwaves are caused by a variety of drivers. These include short term weather events such as fronts, intraseasonal events (30 to 90 days) , annual, and decadal (10-year) modes like El Niño events, and human-caused climate change. [2] [3] [4] Such heatwaves affect marine ecosystems. [5] [6] For example, heatwaves can lead to events such as coral bleaching, sea star wasting disease, [7] [8] harmful algal blooms, [9] and mass mortality of benthic communities. [10] Unlike heatwaves on land, marine heatwaves can extend over vast areas, persist for weeks to months to years, and extend to subsurface levels. [11] [12] [13] [14]

Contents

Major marine heatwaves affected the Great Barrier Reef in 2002, [15] the Mediterranean Sea in 2003, [10] the Northwest Atlantic in 2012, [2] [16] and the Northeast Pacific during 2013–2016. [17] [18] These events had drastic, long-term impacts. [10] [19] [9]

Scientists predict that the frequency, duration, scale (area), and intensity of marine heatwaves will increase. [20] : 1227  This is because sea surface temperatures will continue to increase with global warming. The IPCC Sixth Assessment Report (SAR6) in 2022 stated that "marine heatwaves are more frequent [...], more intense and longer [...] since the 1980s, and since at least 2006 very likely attributable to anthropogenic climate change". [21] : 381  This confirmed earlier findings in a 2019 IPCC report that "Marine heatwaves [...] have doubled in frequency and have become longer lasting, more intense and more extensive (very likely)." [22] : 67  The 2022 report predicted that marine heatwaves will become "four times more frequent in 2081–2100 compared to 1995–2014" under the lower greenhouse gas emissions scenario, or eight times more frequent under the higher emissions scenario. [20] : 1214 

Definition

Global marine heatwave characteristics and case-study regions: 34-year (1982-2015) average properties of marine heatwaves based on daily sea surface temperatures datasets. 41467 2019 10206 Fig1 HTML.webp
Global marine heatwave characteristics and case-study regions: 34-year (1982–2015) average properties of marine heatwaves based on daily sea surface temperatures datasets.

SAR6 defined marine heatwave as: "A period during which water temperature is abnormally warm for the time of the year relative to historical temperatures, with that extreme warmth persisting for days to months. The phenomenon can manifest in any place in the ocean and at scales of up to thousands of kilometres." [1]

A 2016 study defined it as: an anomalously warm event that "lasts for five or more days, with temperatures warmer than the 90th percentile based on a 30-year historical baseline period". [23]

The term was coined following an unprecedented warming event off the west coast of Australia in summer 2011 that led to a rapid dieback of kelp forests and associated ecosystem shifts along hundreds of kilometers of coastline. [24]

Categories

Categories of marine heatwaves Marine Heatwave Categories-en.svg
Categories of marine heatwaves

Categorization allows researchers to compare event drivers and characteristics, geographical and historical trends, and communicate about them consistently. [25]

Marine heatwaves are classified via a naming system, typology, and characteristics. [23] [25] The naming system involves locale and year: for example Mediterranean 2003. [25] [10]

Events are rated on a scale from 1 to 4. Category 1 is a moderate event, Category 2 strong, Category 3 severe, and Category 4 extreme. The category is defined primarily by sea surface temperature anomalies (SSTA), later adjusted to include typology and characteristics. [25]

They are further classified according to the degree of symmetry, duration, intensity (max, average, cumulative), onset rate (slow/fast), decline rate, locale, and frequency. Various combinations have been observed. [23]

While marine heatwaves have mostly been studied at the sea surface, they can also occur at depth, including at the sea floor. [26]

Drivers

Space and time scales of characteristic MHW drivers. Schematic identifying the characteristic marine heatwave drivers and their relevant space and time scales, 41467 2019 10206 Fig2 HTML.webp
Space and time scales of characteristic MHW drivers. Schematic identifying the characteristic marine heatwave drivers and their relevant space and time scales,

The drivers for marine heatwave events can be broken into local processes, teleconnection processes, and regional climate patterns. [2] [3] [4] Two quantitative measurements of these drivers have been proposed to characterize marine heatwaves, mean sea surface temperature and sea surface temperature variability. [25] [2] [4]

At the local level marine heatwave events are dominated by ocean advection, air-sea fluxes, thermocline stability, and wind stress. [2] Teleconnection processes refer to climate and weather patterns that connect geographically separated areas. [27] The teleconnection processes that play a dominant role are atmospheric blocking/subsidence, jet-stream position, oceanic kelvin waves, regional wind stress, warm surface air temperature, and seasonal climate oscillations. These processes contribute to regional warming trends that disproportionately affect Western boundary currents. [2]

Regional climate patterns including interdecadal oscillations like El Niño Southern Oscillation (ENSO) have contributed to marine heatwave events such as "The Blob" in the Northeastern Pacific. [28]

Drivers that operate on the scale of biogeographical realms or the Earth as a whole are decadal oscillations, including Pacific decadal oscillations (PDO), and climate change. [2] [4] [29] : 607 

Ocean carbon sinks in the mid-latitudes of both hemispheres and carbon outgassing areas in upwelling regions of the tropical Pacific experience persistent marine heatwaves. [30]

Climate change

Sea surface temperature since 1979 in the extrapolar region (between 60 degrees south and 60 degrees north latitude) 1979- Daily sea surface temperatures 60S-60N latitudes.png
Sea surface temperature since 1979 in the extrapolar region (between 60 degrees south and 60 degrees north latitude)

Scientists predict that SSTs were expected to increase, along with the frequency, duration, scale (or area) and intensity of marine heatwaves will increase due to climate change. [20] : 1227  The extent of ocean warming depends on emissions mitigation efforts. More greenhouse gas emissions and/or less mitigation push SSTs up. Emissions scenarios are called Shared Socioeconomic Pathways (SSP). Higher number imply higher emission levels. The low emissions scenario (SSP1-2.6) would trigger an increase of 0.86 °C, while the high emissions scenario (SSP5-8.5) would be as high as 2.89 °C. [20] : 393 

Marine heatwaves are predicted to become "four times more frequent in 2081–2100 compared to 1995–2014" under the low emissions scenario, or eight times more frequent under the high emissions scenario. [20] : 1214  Mathematical model CMIP6 is used for these predictions. The predictions are for the period (2081-2100) compared to the average of (1995- 2014). [20] : 1227 

Ocean warming is projected to push the tropical Indian Ocean into a basin-wide near-permanent heatwave state by the end of the 21st century, where marine heatwaves are projected to increase from 20 days per year (1970–2000) to 220–250 days per year. [31]

List of events

Sea surface temperatures have been recorded since 1904 in Port Erin, Isle of Man, [4] and measurements continue through global organizations such as NOAA, NASA, and many more. Events can be identified from 1925 till present day. [4] The list below is not a complete representation of all marine heatwave events that have ever been recorded.

List of some marine heatwaves 1999–2023
Region and dateCategoryDuration
(days)		Intensity
(°C)		Area
(millions of
km2)		Ref.
Mediterranean 1999181.9NA [25] [2] [10]
Mediterranean 20032105.50.5 [25] [2] [10]
Mediterranean 20032284.61.2 [25] [2] [10]
Mediterranean 20062334.0NA [25] [2] [10]
Western Australia 199931322.1NA [25] [2] [32]
Western Australia 20114664.90.95 [25] [2] [32]
Great Barrier Reef 20162554.02.6 [25] [2] [15]
Tasman Sea 201522522.7NA [25] [2]
Northwest Atlantic 201231324.30.1–0.3 [25] [2] [16] [33]
Northeast Pacific 2015 ("The Blob")37112.64.5–11.7 [5] [17] [18]
Santa Barbara 20153935.1NA
Southern California Bight 20183443.9NA [34]
Northeastern Atlantic 20235304.0–5.0NA [35]

Impacts

Bleachedcoral.jpg
Bleached coral
Lodestone Reef Valentines Day 2016, Green Chromis on Coral.jpg
Healthy coral

Many species already experience these temperature shifts during the course of marine heatwave events. [23] [25] Many increased risk factors and health impacts affect coastal and inland communities as global average temperature and extreme heat events increase. [36]

Ecosystems

Changes in the thermal environment can have drastic effects on the health and well-being of terrestrial and marine organisms. [19] [36] Marine heatwave events increase habitat degradation, [37] [38] change species' range, [19] complicate fisheries management, [17] contribute to mass mortality, [10] [9] [7] and generally reshape ecosystems. [5] [15] [39]

Habitat degradation occurs through restructuring and sometimes complete loss of habitats such as seagrass beds, corals, and kelp forests. [37] [38] These habitats contain a significant proportion of the oceans' biodiversity. [19] Changes in currents and thermal environments have already shifted many marine species' ranges away from the equator. Large range shifts, along with outbreaks of toxic algal blooms, have impacted species across taxa. [9] Management of migrant species becomes increasingly difficult and food web dynamics shift.

SST increases are linked to a decline in species abundance such as the mass mortality of 25 benthic species in the Mediterranean in 2003, sea star wasting disease, and coral bleaching events. [10] [19] [7] Marine heatwaves in the Mediterranean Sea during 2015–2019 resulted in widespread mass sealife die-offs in five consecutive years. [40] Repeated marine heatwaves in the Northest[ clarification needed ] Pacific led to dramatic changes in animal abundances, predator-prey relationships, and energy flux throughout the ecosystem. [5] Marine heatwave events were expected to impact species distribution. [29] : 610 

Coral bleaching

This section is an excerpt from Coral bleaching § Trends due to climate change.[ edit ]

Extreme bleaching events are directly linked with climate-induced phenomena that increase ocean temperature, such as El Niño-Southern Oscillation (ENSO). [41] The warming ocean surface waters can lead to bleaching of corals which can cause serious damage and 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". [42] : 416  Coral reefs, as well as other shelf-sea ecosystems, such as rocky shores, kelp forests, seagrasses, and mangroves, have recently undergone mass mortalities from marine heatwaves. [42] : 381  It is expected that many coral reefs will "undergo irreversible phase shifts due to marine heatwaves with global warming levels >1.5°C". [42] : 382 

This problem was already identified in 2007 by the Intergovernmental Panel on Climate Change (IPCC) as the greatest threat to the world's reef systems. [43] [44]

The Great Barrier Reef experienced its first major bleaching event in 1998. Since then, bleaching events have increased in frequency, with three events occurring in the years 2016–2020. [45] Bleaching is predicted to occur three times a decade on the Great Barrier Reef if warming is kept to 1.5 °C, increasing every other year to 2 °C. [46]

With the increase of coral bleaching events worldwide, National Geographic noted in 2017, "In the past three years, 25 reefs—which comprise three-fourths of the world's reef systems—experienced severe bleaching events in what scientists concluded was the worst-ever sequence of bleachings to date." [47]

In a study conducted on the Hawaiian mushroom coral Lobactis scutaria , researchers discovered that higher temperatures and elevated levels of photosynthetically active radiation (PAR) had a detrimental impact on its reproductive physiology. The purpose of this study was to investigate the survival of reef-building corals in their natural habitat, as coral reproduction is being hindered by the effects of climate change. [48]

On weather patterns

The marine heatwave termed "The Blob" that occurred in the Northeastern Pacific from 2013 to 2016. Podaac blob colordata sst2015.jpg
The marine heatwave termed "The Blob" that occurred in the Northeastern Pacific from 2013 to 2016.

Marine heatwaves in the tropical Indian Ocean were associated with dry conditions over central India and an increase in rainfall over south peninsular India in response to marine heatwaves in the northern Bay of Bengal. These changes are transmitted by monsoon winds. [50]

See also

References

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