{"id":40093371,"date":"2023-07-13T12:30:05","date_gmt":"2023-07-13T11:30:05","guid":{"rendered":"https:\/\/chinadialogueocean.net\/?post_type=explainer&p=93371"},"modified":"2024-12-16T17:17:54","modified_gmt":"2024-12-16T17:17:54","slug":"what-are-marine-heatwaves-climate-change-el-nino","status":"publish","type":"explainer","link":"https:\/\/dialogue.earth\/en\/ocean\/what-are-marine-heatwaves-climate-change-el-nino\/","title":{"rendered":"How do \u2018marine heatwaves\u2019 affect the ocean \u2013 and what can be done?"},"content":{"rendered":"\n

On 4 July 2023, the World Meteorological Organization declared<\/a> the beginning of an El Ni\u00f1o phase<\/a>, a climate pattern that drives up temperatures across land and sea.<\/p>\n\n\n\n

Past weather events provide clues about what extreme temperatures could mean for the ocean. For instance, in December 2010, a wave of unusually warm water swept across the luxuriant and biodiverse seagrass meadows of Australia\u2019s Shark Bay. In a matter of days, it destroyed a third of the habitat, unthreading the delicate seagrass quilt and, over the next three years, releasing between 2 and 9 billion tonnes<\/a> of carbon into the atmosphere. \u201cThe losses there were phenomenal,\u201d says Kathryn Smith, a researcher with the UK\u2019s Marine Biological Association.<\/p>\n\n\n\n

Scientists call the event a \u201cmarine heatwave\u201d, meaning a period of exceptionally high water temperature that starts suddenly and continues for days to months, distinguishing it from long-term warming trends. Like heatwaves on land that threaten terrestrial ecosystems, heatwaves at sea harm marine life, posing \u201ca clear and present threat to the systems we depend on,\u201d says Sarah Cooley, director of climate science at the Ocean Conservancy.<\/p>\n\n\n\n

These impacts are expected to grow. The UN\u2019s climate science body, the IPCC, projects that by 2100 marine heatwaves will be up to 50-fold<\/a> more frequent, and 10-fold more intense compared to pre-industrial times. Scientists are now developing ways to forecast these events. Their research can feed into measures that mitigate the threats for vulnerable habitats, species, and the coastal communities that depend on them.<\/p>\n\n\n\n

What are the impacts of heatwaves?<\/h2>\n\n\n\n

The ocean absorbs 90%<\/a> of the excess heat caused by greenhouse gas emissions in the atmosphere. On top of this, climate change is amping up weather conditions that inject even more heat into the planet\u2019s largest ecosystem.<\/p>\n\n\n\n

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One of these is high-pressure systems. While low-pressure systems bring cool, cloudy air that draws heat out of the ocean, attracting colder, nutrient-rich waters to the surface, high-pressure systems disrupt these. They bring warmer, windless, cloudless conditions in which the sun can heat the water unimpeded. Fewer nutrients rise to the water\u2019s surface to support the base of the marine food chain, such as krill and phytoplankton.<\/p>\n\n\n\n

In 2014, these factors combined to create a gigantic sauna in the North Pacific. Hundreds of kilometres wide and 6C warmer than average, it was known as \u201cthe Blob<\/a>.\u201d The sudden displacement of nutrients spelled disaster for fish, seabirds, and cetaceans who had to migrate elsewhere to find food, or simply starved.<\/p>\n\n\n\n

By the time the Blob had dissipated, an estimated one million seabirds had died, along with countless crustaceans, fish and seals. A record number<\/a> of whales became entangled in fishing gear when searching for food closer to shore.<\/p>\n\n\n\n

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Divers attempt to rescue a humpback whale trapped in a fishing net in Spanish seas, May 2023 (Image: Alamy)<\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n
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Documenting bleached coral in Australia\u2019s Great Barrier Reef (Image: The Ocean Agency \/ The Ocean Image Bank)<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

Warm water surges can also make conditions unbearable in sensitive hubs of biodiversity like seagrass meadows, coral reefs, and kelp <\/a>beds<\/a>. Compared to general ocean warming, heatwaves lead to faster bleaching<\/a>, more coral death, and the decimation of kelp forests. Higher water temperatures also trigger suffocating algal blooms that drive large scale die-offs of marine life.<\/p>\n\n\n\n

For instance, kelp forests along a 100km stretch of western Australia were erased<\/a> by the same heatwave that destroyed the Shark Bay seagrass fields in 2010. \u201cThat was 12 years ago, and the kelp hasn\u2019t returned,\u201d says Smith, whose primary research focus is marine heatwaves.<\/p>\n\n\n\n

What causes these events?<\/h2>\n\n\n\n

Scientists are still unpicking the meteorological triggers behind these phenomena, but they are linked to<\/a> anthropogenic climate change. One hypothesis<\/a> is that as the Arctic warms \u2013 three times faster than the planetary average \u2013 its temperature difference with the tropics is reduced. Svenja Ryan, a physical oceanographer at the Woods Hole Oceanographic Institute, explains that this reduction might weaken the jet stream that usually pushes a band of rain and wind around the centre of the planet. The air current then becomes more vulnerable to intrusion by high pressure systems, which block usual atmospheric processes and form hovering hot air islands over land and sea.<\/p>\n\n\n\n

The changes in the strength and direction of ocean currents could also trigger marine heatwaves, as some of the currents are transporting warm water to regions that they didn\u2019t before.<\/p>\n\n\n\n

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Sea surface temperature anomalies recorded on 19 June 2023. The cluster of red and orange at top right shows the record-breaking marine heatwave that hit the north-east Atlantic in late June. (Image: NOAA Marine Heatwave Watch<\/a>)<\/div><\/div><\/div><\/div>\n\n\n\n

What are the costs of hotter seas?<\/h2>\n\n\n\n

Comparisons against historical datasets show that the number of marine heatwave days has increased by 54%<\/a> since 1925, and eight of the hottest 10<\/a> on record have occurred in the last 13 years. \u201cThey are happening, they are really intense in certain regions, and they can really impact local communities and also economies,\u201d Ryan says.<\/p>\n\n\n\n

This socioeconomic toll is increasingly visible. Smith of the UK\u2019s Marine Biological Association says: \u201cThere are lots of coastal communities who are losing their entire income in one hit from marine heatwaves.\u201d<\/p>\n\n\n\n

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After the Blob, the Gulf of Alaska\u2019s cod fishery, worth $100 million<\/a> annually, collapsed<\/a>. A 2016 heatwave off Chile\u2019s coast triggered a toxic algal bloom that destroyed 20% of the country\u2019s salmon farming production for the year, and cost the industry $800 million<\/a>. Meanwhile, a survey<\/a> shows that if general ocean warming continues and coral bleaching worsens in Australia\u2019s Great Barrier Reef, the country will suffer $1 billion<\/a> in lost tourism.<\/p>\n\n\n\n

Increasingly popular carbon credit schemes that depend on intact seagrass meadows and kelp forests may also be undermined by marine heatwaves, Smith explains. Her research<\/a> shows that 34 ocean heatwaves over the last 25 years have in fact cost several billion dollars annually in lost fisheries, tourism, and carbon storage. Harder to measure is the lost cultural value<\/a> caused by heatwaves, and their contribution to extreme weather<\/a> events like hurricanes. <\/p>\n\n\n\n

How to adapt to heatwaves?<\/h2>\n\n\n\n

To stop excessive heat warming our oceans at root, we need to cut greenhouse gas emissions. But Cooley says it will take a while for the effects of decarbonisation to show. \u201cWe have so much heating that\u2019s sort of \u2018locked in\u2019, and [in the meantime] the heatwaves will be getting worse and more extreme,\u201d she explains. \u201cBut we know that we can decrease the other things under our control.\u201d<\/p>\n\n\n\n

Strengthening ecosystem resilience gives environments and their inhabitants the best chance of surviving warmer seas, Cooley says. Therefore, measures like reducing pollution and protecting more habitats like kelp beds and seagrass meadows can help mitigate the risks of marine heatwaves. \u201cHaving a large bank of a healthy ecosystem is still an insurance policy for us,\u201d she adds.<\/p>\n\n\n\n

\"a<\/div>
Seagrass shoots, tied to a square of burlap, ready to be planted in Florida\u2019s Indian River Lagoon, March 2023. Ecosystem restoration projects like this can help to make the ocean more resilient to future heatwaves. (Image: Kim Shiflett \/ NASA)<\/div><\/div><\/div><\/div>\n\n\n\n

Meanwhile, there\u2019s a growing effort to forecast marine heatwaves, as we do those on land. The nascent science still requires more research looking into how these phenomena influence ocean currents, chemistry and food availability, and even how deep into the sea heatwaves reach. This knowledge is essential if we are to match the predictive precision we have on land.<\/p>\n\n\n\n

But research suggests that under certain meteorological conditions, we could forecast some marine heatwaves up to a year in advance, says Michael Jacox, an oceanographer at the US National Oceanic and Atmospheric Administration and lead author on the study<\/a> that developed this estimate.<\/p>\n\n\n\n

We can\u2019t save it all, so what do we try and protect?<\/blockquote>Kathryn Smith, Marine Biological Association<\/cite><\/div><\/div>\n\n\n\n

\u201cI think the real crux of [forecasting] is in the translation to impacts, and then decision-making,\u201d Jacox adds. More detailed information on when and where marine heatwaves will roll in creates room to adapt. Conservationists could pinpoint habitats in their path, and perhaps even introduce measures<\/a> to shield them against the worst of the warming. Fishers could switch to less-threatened species, or move aquaculture pens out of harm\u2019s way. Where livelihoods are threatened, forecasts could trigger financial support for communities most affected. Ideally, proactive national policies that recognise the reality of marine heatwaves would guide and support the interventions.<\/p>\n\n\n\n

Today, Shark Bay\u2019s seagrass meadows still bear the scars<\/a> of the 2010 heatwave. Many ecosystems will face a similar threat from an increasingly febrile ocean, especially if events like El Ni\u00f1o heap more heat pressure onto it. Smith of the UK\u2019s Marine Biological Association says: \u201cWe can\u2019t save it all, so what do we try and protect? It\u2019s about learning what the change is, and where the focus needs to be.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

As we enter El Ni\u00f1o, periods of surging temperatures at sea are predicted to grow more frequent and intense. What do they do to marine life, and can we adapt? <\/p>\n","protected":false},"featured_media":40093380,"comment_status":"closed","ping_status":"closed","template":"","categories":[761,50039901],"tags":[513,519,40027778],"country":[],"class_list":["post-40093371","explainer","type-explainer","status-publish","has-post-thumbnail","hentry","category-climate","category-ocean","tag-carbon-emissions","tag-climate-impacts","tag-marine-protection"],"acf":[],"yoast_head":"\nHow do \u2018marine heatwaves\u2019 affect the ocean \u2013 and what can be done?<\/title>\n<meta name=\"description\" content=\"As we enter El Ni\u00f1o, heatwaves at sea are predicted to grow more frequent and intense. 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