location: Arctic Ocean

location: Arctic Ocean

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Colliding icebergs and chirping seals: Polar ocean sounds are reimagined in art-science collaboration
- The United Nations declared the 2020s the UN Decade of Ocean Science for Sustainable Development to highlight the need for public engagement, citizenship, and connection to harness positive change for the world’s seas.
- Art and science collaborations can make the hidden depths of the oceans come alive for people via creative pieces drawing from real marine research.
- Researchers in Germany and artists from around the world united to highlight the sounds of the polar oceans through art projects created with recordings from the Ocean Acoustics Group at the Alfred Wegener Institute.

Killer whales have found new homes in the Arctic Ocean, potentially reshaping marine ecology
- The vast ice sheets that historically kept killer whales out of the Arctic Ocean are melting as the region rapidly warms.
- Two small, genetically distinct groups of killer whales now live in the Arctic, after migrating from more southern regions of the Atlantic Ocean.
- Killer whales put pressure on the local ecosystem, including Arctic whales important to Indigenous groups.

Norway poised to sail past opposition with deep-sea mining licensing plans
- In June, Norway proposed 386 license areas in the Norwegian Sea for future deep-sea mining activities.
- During the ensuing three-month public consultation period, the government received more than 70 responses from various organizations and members of the public. The responses offered a mix of views: the majority opposed Norway’s deep-sea mining plans, a minority expressed support, and many across the board called for more research.
- One entity criticizing Norway’s plans is the country’s own environment agency, which argued that there’s a lack of knowledge to safely pursue deep-sea mining while protecting the marine environment.
- Norway’s government has stated that it intends to begin issuing licenses in 2025 with a view to starting seabed mineral exploitation in 2030.

Arctic sea ice hits summer minimum; Antarctic hovers at new winter lows
- The Antarctic winter sea ice maximum is on track to be the second lowest on record, at 17.15 million square km² (6.62 million mi²), close to the 2023 record low of 16.96 million km² (6.55 million mi²). Some scientists see this as anomalous. Others see it as a shift in the southern polar environment, maybe triggered by climate change.
- The Arctic summer sea ice minimum also stayed low this year, at 4.28 million km² (1.65 million mi²), making it the 7th lowest minimum in the satellite record. So far, 2012 saw the record minimum of 3.41 million km² (1.32 million mi²).
- Polar sea ice losses have global impacts. In one analysis, researchers estimated the planetary cooling effects of Arctic and Antarctic sea ice during 2016-2023 were about 20% and 12% less, respectively, than they were during 1980-1988, leading to almost 15% less cooling power for the planet.
- With about 12% declines of Arctic Ocean ice each decade, researchers predict a nearly ice-free Arctic summer by 2050, allowing more shipping through the Northwest Passage but threatening this unique polar ecosystem. Studies also show the Antarctic ice sheet to be increasingly at risk, particularly Western Antarctica.

Arctic melt ponds influence sea ice extent each summer — but how much?
- July marks the midpoint of the summer sea ice melt season, during which ice declines rapidly under the almost constant Arctic sun, and melt ponds form on ice floes. Scientists study melt ponds to better understand sea ice dynamics and to help forecast the annual sea ice minimum in September.
- Sea ice melt ponds absorb more solar energy than bare ice or snow but far less than open ocean, which complicates the story of summer sea ice melt. But in the past, scientists lacked the tools to accurately measure melt pond impacts.
- New remote sensing data look at sea ice from different satellite resolutions. High-resolution imaging sends a clear picture of melt ponds in a very small area, while low-resolution imaging produces a fuzzy picture of them across the entire Arctic.
- A combination of satellite data and on-the-ice observations now help scientists track the evolution of sea ice melt ponds and their influence on the overall decline of sea ice in the Arctic.

Indigenous Alaskans drive research in a melting arctic
- In Utqiagvik, Alaska, the Iñupiat rely on whaling and subsistence hunting for the bulk of their diet, a practice dating back thousands of years.
- Powered by mineral wealth, the Iñupiat-run North Slope Borough Department of Wildlife Management employs a collaborative team of scientists and hunters.
- Though the arctic is warming nearly four times faster than the global average, the Iñupiat are confident in their ability to adapt their practices to changing conditions.
- The Department of Wildlife Management provides a potential model for collaborations between Indigenous peoples and western researchers — with Indigenous leaders in charge of funding and resource allocation.

Polar warning: Warming temperatures mean more than melted ice
- The Arctic and Antarctic are changing rapidly in response to global warming, with scientists striving to understand how escalating impacts on these unique regions impact the rest of the world. This story summarizes three significant recent studies.
- A new comprehensive greenhouse gas budget for Arctic terrestrial ecosystems estimates that the permafrost-covered region now emits more greenhouse gases — including carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) — than it stores. That trend is expected to accelerate if Arctic warming worsens further.
- Another recent study looked at the ice shelves edging the Antarctic continent, which act as brakes slowing the flow of glacial ice into the ocean that adds to sea-level rise. Although many factors impact the mass and stability of these shelves, a new model shows El Niño warming events help melt ice from below to increase shelf loss.
- Scientists also analyzed a record-breaking heat wave hitting Antarctica in March 2022, when temperatures soared by up to 40°C (72°F) above normal. They determined that this “black swan” event is having long-term impacts on the region’s ecosystems. The odds are that more such high-heat events will occur in future.

Report ranks 60+ ideas, including geoengineering, to save the Arctic
- Given that the serious impacts of climate change are rapidly escalating, some scientists, backed up increasingly by governments, are looking into extreme measures such as geoengineering to slow the rate of change.
- A new report examines 61 climate mitigation ideas for the Arctic, including geoengineering.
- The report ranked tried and true measures, like restoring peatlands, the highest, but some geoengineering ideas, such as solar geoengineering, also ranked high.
- Researchers say, however, that while geoengineering ideas may be worth studying, the goal right now must be to aggressively cut emissions. Some also fear that geoengineering will become a costly distraction, diverting attention from the need for fossil fuel companies to cut production, and for decarbonization of the economy.

Plastic pollution talks end & Arctic peoples return home to a ‘sink’ of plastic
- In the wake of the plastics treaty talks in Ottawa, a new report highlights the severe impacts of plastics and petrochemicals on Arctic Indigenous communities.
- Indigenous delegates were left with bittersweet feelings that negotiations did not lead to commitments to cut plastic production, while oil companies and producing countries say more recycling is the answer.
- The Arctic is a hemispheric sink collecting plastic pollution from all corners of the world and is melting four times faster than the rest of the world.
- Indigenous communities in Alaska are among those who bear the brunt of climate change and plastic pollution, with studies finding toxic chemicals in peoples’ blood, breast milk and placentas, and melting ice impacting hunting and food security.

It will take 880 years to achieve UN ocean conservation goals, at this rate (commentary)
- Indigenous conservationist Angelo Villagomez will speak at the Our Ocean conference, one of the largest and highest profile conferences of its kind, this week in Athens, Greece.
- He plans to say that ocean conservation has lost momentum toward protecting 30% of the ocean by 2030 and that a lot more needs to be done to address the human dimensions of conservation, including guaranteeing access rights, equity, and justice.
- “At this rate, raising the area of global ocean protection from 8% to 30% will take an additional 880 years,” he argues in a new op-ed.
- This post is a commentary. The views expressed are those of the author, not necessarily Mongabay.

Freeze on Russian collaboration disrupts urgently needed permafrost data flow
- Accelerating Arctic warming threatens to thaw more and more carbon-rich permafrost and release vast amounts of greenhouse gases into the Earth’s atmosphere, but scientists don’t know when such a tipping point event might occur.
- The potential for large and abrupt permafrost emissions adds urgency to better understanding the factors that could turn permafrost from a carbon sink into a carbon source.
- However, more than half of all Arctic permafrost lies under Russian soil, and a two-year freeze on collaborations between Russian scientists and the international scientific community — prompted by the Russian invasion of Ukraine on Feb. 24, 2022 — is disrupting data flows and hamstringing the polar research community.
- Despite an uncertain geopolitical landscape, scientists are determined to close the data gap with work-arounds such as pivoting to “proxy” field sites, ramping up remote sensing with AI, and mining archived data for new insights. But reintegrating Russian research with other Arctic research is a priority of the scientific community.

The new Arctic: Amid record heat, ecosystems morph and wildlife struggle
- Every species of animal and plant that lives or breeds in the Arctic is experiencing dramatic change. As the polar region warms, species endure extreme weather, shrinking and altered habitat, decreased food availability, and competition from invading southern species.
- A wide array of Arctic organisms that rely on sea ice to feed or breed during some or all of their life cycles are threatened by melt: Over the past 40 years, the Arctic Ocean has lost about 75% of its sea ice volume, as measured at the end of the summer melt season. This translates into a loss of sea ice extent and thickness by half on average.
- Researchers note that the rate of change is accelerating at sea and on land. While species can adapt over time, Arctic ecosystem alterations are too rapid for many animals to adapt, making it difficult to guess which species will prevail, which will perish, and where.
- The only thing that could limit future extinctions, researchers say, is to quickly stop burning fossil fuels, the main driver of climate change.

EU parliament expresses disapproval of Norway’s deep-sea mining plans
- On Feb. 7, members of the European Parliament voted in favor of a resolution that raises concerns about Norway’s intentions to begin deep-sea mining activities.
- Although the resolution doesn’t hold any legal power, experts say it sends a strong signal to Norway that it doesn’t have the European support it may be relying on.
- Norway’s foreign ministry said that it has taken note of the resolution, adding that, like its European partners, it is committed to “sustainable ocean management.”
- In January, Norway voted to allow deep-sea mining exploration to commence in its waters.

North Atlantic orcas reveal the troubling persistence of toxic ocean pollutants
- As the top predators in the ocean, killer whales suffer from the magnifying level of pollutants that build up in the marine food web.
- Scientists found that North Atlantic orcas feeding on marine mammals carry significantly higher levels of pollutants than orcas that eat fish.
- Levels of polychlorinated biphenyls in the orcas’ blubber are ten times higher than the toxic threshold for these dangerous household chemicals.

Record North Atlantic heat sees phytoplankton decline, fish shift to Arctic
- Scientists warn that record-high sea surface temperatures in the North Atlantic Ocean this year are having consequences for sea life.
- As marine heat waves there have worsened over the years, populations of phytoplankton, the base of the oceanic food chain, have declined in the Eastern North Atlantic.
- With experts predicting more heat anomalies to come, North Atlantic fish species are moving northward into the Arctic Ocean in search of cooler waters, creating competition risks with Arctic endemic species and possibly destabilizing the entire marine food web in the region.
- Lengthening and intensifying marine heat waves around the globe are becoming a major concern for scientists, who warn that the world will see even greater disruptions to ocean food chains and vital fisheries, unless fossil fuel burning is curtailed.

Sensing tech used in oil pipelines can also track Arctic sea ice, study shows
- Scientists have used undersea fiber-optic cables in the Arctic to remotely track the presence and extent of sea ice.
- Sea ice is usually monitored with the help of satellites; however, the lack of high-resolution images and the low frequency of data collection makes it difficult to do in-depth analysis.
- Using a method commonly employed to monitor oil pipelines and highways, the scientists looked for changes in signals sent down a fiber-optic cable in the Beaufort Sea that would indicate the presence of sea ice.
- While promising, the method can’t yet be used to measure the thickness of sea ice or to determine how far the ice extends to either side of the cable.

To protect the oceans, we must map them (commentary)
- About 80% of our oceans remain “unmapped, unobserved, and unexplored,” according to NOAA.
- Technologies like un-crewed marine drones, high-resolution satellites, and remote operating vehicles are now being paired with modern digital mapping techniques to reveal critical new insights about the oceans.
- “Considering we’ve barely mapped a quarter of [the oceans] so far, imagine what we could know, what we could prepare for, if every inch was mapped,” a new op-ed suggests.
- This article is a commentary. The views expressed are those of the author, not necessarily Mongabay.

Melting Arctic sea ice is changing bowhead whale migrations, study finds
- Research has found that some bowhead whales in the Bering–Chukchi–Beaufort (BCB) population are no longer migrating to the northwestern Bering Sea in the winter but remain in the Canadian Beaufort Sea.
- These migratory shifts are occurring as sea ice declines in the region due to climate change.
- These changes could mean that bowhead whales become more susceptible to ship strikes, underwater noise, and entanglements, and that Indigenous communities may not be able to rely on bowhead whales for nutrition and cultural subsistence.
- However, this bowhead population is currently not threatened, and these changes may not be fully impacting Indigenous communities yet.

Norway proposes opening Germany-sized area of its continental shelf to deep-sea mining
- Norway has proposed opening up a Germany-sized part of the Norwegian Sea to deep-sea mining.
- The area holds considerable quantities of minerals needed for renewable energy technologies, such as magnesium, cobalt, copper, nickel and rare-earth metals.
- The Norwegian government and industries say they will take a precautionary approach to this deep-sea mining.
- However, critics say plans should be progressing more slowly to properly assess the marine environment and the possible impacts of mining, and the Norwegian government received numerous responses during a public consultation period arguing that the country should not mine its deep sea.

Southern atmospheric rivers drive irreversible melting of Arctic sea ice: Study
- Arctic sea ice extent has reached its winter maximum extent for 2023 at 14.62 million sq. km., the fifth lowest on record. Combined with this year’s unprecedentedly small Antarctic sea ice summer minimum extent, global sea ice coverage reached a record low in January.
- Arctic sea ice is not only receding, but also seriously thinning. New research has found that a huge melt in 2007 and associated ocean warming kicked off a “regime shift” to thinner, younger, more mobile and transient ice that may be “irreversible.”
- A big reason why Arctic sea ice is declining even in the frigid polar winter is that atmospheric rivers, which carry warmth and rainfall like the deluges seen in California recently, are surging up from the south and penetrating the Arctic more often.

More than half of reef sharks and rays threatened with extinction, study shows
- More than half of known species of coral reef sharks and rays are already threatened with extinction, mostly because of overfishing, according to new research.
- The researchers reported that population trends were declining for 94 coral reef shark and ray species; of the two groups, rays were more threatened than sharks.
- Reef sharks and rays are typically caught for human consumption, and to a lesser extent for use in apparel or accessories, in aquarium displays, as food for domestic animals, and in traditional medicine.
- The study calls for urgent urgent measures to improve regional fisheries and marine protected areas management.

Arctic sea ice loss to increase strong El Niño events linked to extreme weather: Study
- The frequency of strong El Niño events could increase by 35% by the end of the century as Arctic sea ice begins to melt out completely in the summer, according to a recent modeling study. El Niños — buildups of especially warm water in the eastern Pacific off of Peru — often trigger ‘devastating’ droughts, floods and cyclones around the globe.
- The findings provide more evidence that Arctic warming is affecting weather in other parts of the world — not only in the mid-latitudes, but as far away as the tropics.
- Other recent studies have found that sea ice loss is causing rapid acidification of the Arctic Ocean and more extreme precipitation and flooding in Svalbard, a Norwegian archipelago located between mainland Norway and the North Pole.

2022: Another consequential year for the melting Arctic
- Arctic sea ice extent shrank to its summertime minimum this week — tied with 2017 and 2018 for the 10th lowest ever recorded. However, the last 16 consecutive years have seen the least ice extent since the satellite record began. Polar sea ice extent, thickness and volume all continue trending steeply downward.
- Arctic air temperatures were high this summer, with parts of the region seeing unprecedented heating. Greenland saw air temperatures up to 36° F. above normal in September. Canada’s Northwest Territories saw record highs, hitting the 90s in July. Sea temperatures also remained very high in many parts of the Arctic Ocean.
- Scientists continue to be concerned as climate change warms the far North nearly four times faster than the rest of the planet, sparking concern over how polar warming may be impacting the atmospheric jet stream, intensifying disastrous extreme weather events worldwide, including heat waves, droughts and storms.
- While a mostly ice-free Arctic could occur as early as 2040, scientists emphasize that it needn’t happen. If humanity chooses to act now to drastically reduce greenhouse gas emissions, downward sea ice extent and volume trends could potentially be reversed.

The mystery of narwhal behavior, solved by chaos theory
- Researchers have used mathematical models based on chaos theory to analyze the movements of a pod of satellite-tagged narwhals.
- Around solar noon, narwhals rest nearer the surface and take deep dives. At night, their dives are shallower but with more rapid and intense movement, likely to hunt for squid. Narwhal behavior also changed according to how much sea ice was present.
- The narwhal life cycle is closely linked to ice. Researchers say this new method may be useful for understanding the challenges narwhals and other Arctic animals face due to the loss of sea ice from climate change.
- Narwhals are among the most highly threatened animals in the Arctic due to hunting, predation, climate change, and the ships and noise pollution associated with oil and gas mining and exploration.

Greenland’s sustainable halibut fishery may threaten newfound corals, sponges
- Industrial trawling for halibut in the Davis Strait off western Greenland is currently done in a certified sustainable manner, but new studies suggest it may be doing long-term harm.
- The studies describe assemblages of unique marine life on the seafloor both inside and near the halibut fishing zones that could potentially be considered “vulnerable marine ecosystems.”
- Scientists have called for protection of these potential VMEs, but acknowledge that ending bottom trawling altogether isn’t a viable option when fishing accounts for 93% of Greenland’s exports.
- Fishing industry stakeholders say they’re confident that existing rules designed to help the halibut fishery meet sustainability requirements will be sufficient to spare these potential VMEs, and point to a new management plan for the entire Greenlandic seabed that is in development as a way to strengthen protections.

Multiyear ice thinner than thought as Arctic sea ice reaches winter max: Studies
- Arctic sea ice has reached its yearly maximum extent at 14.88 million sq. km., the 10th lowest on record. The up-and-down story of sea ice extent in the past year highlights how unpredictable it can be from season to season, even as the overall decline continues.
- A study employing new satellite data found that Arctic multiyear sea ice — ice that survives the summer melt — is thinning even faster than previously thought and has lost a third of its volume in just two decades.
- This comes as Antarctic sea ice extent hit a record summer low, raising questions whether it is beginning a long-term decline, although experts are wary of drawing conclusions yet.
- While summer Arctic sea ice is predicted to mostly disappear by 2050, a new study suggests we could likely preserve it through 2100 by aggressively cutting methane emissions by 2030, along with reaching net-zero CO2 emissions by 2050.

Keep polar bears and their extensive range safe from oil drilling (Commentary)
- In September 2021, a group of conservation groups sued the U.S. Fish & Wildlife Service to challenge a regulation they allege would allow oil and gas operators to harass, harm and potentially kill polar bears on land and sea in Arctic Alaska.
- In this commentary Steve Blackledge and Dyani Chapman of Environment America argue the battle to save the polar bear can’t be limited to the boundaries of the Arctic National Wildlife Refuge.
- “We hope the courts will examine the facts on the ground and force the government back to the drawing board, leading to a regulation that’s far less threatening and much more protective of the polar bear.”
- The views expressed are those of the authors, not necessarily Mongabay.

Researchers express alarm as Arctic multiyear sea ice hits record low
- Low sea ice concentration can create a misleading picture of sea ice health in the Arctic. Though extent is only at its 10th lowest since satellite records began in 1979, the waters north of Alaska this September are full of diffuse ice.
- Of great concern to scientists, the Arctic has lost 95% of its thick multiyear sea ice since 1985. Older, thicker ice acts as a buffer against future Blue Ocean Events, expected as early as 2035. A BOE would mark a year when most Arctic ice melts out in summer.
- It no longer takes a freak-weather year to reach near record-lows for extent or volume. 2020 saw a second-place finish in the record book, behind 2012.

As Arctic warms, scientists wrestle with its climate ‘tipping point’
- A leaked version of the newest science report from the U.N. Intergovernmental Panel on Climate Change warns of looming, potentially catastrophic tipping points for Arctic sea ice melt, tundra thaw, savannification of the Amazon rainforest, and other planetary environmental thresholds beyond which recovery may be impossible.
- But what are tipping points, and how does one pinpoint what causes them, or when they will occur? When studying a vast region, like the Arctic, answering these questions becomes dauntingly difficult, as complex positive feedback loops (amplifying climate warming impacts) and negative feedback loops (retarding them) collide with each other.
- In the Arctic, one working definition of a climatic tipping point is when nearly all sea ice disappears in summer, causing a Blue Ocean Event. But attempts to model when a Blue Ocean Event will occur have run up against chaotic and complex feedback loop interactions.
- Among these are behaviors of ocean currents, winds, waves, clouds, snow cover, sea ice shape, permafrost melt, subarctic wildfires, aerosols and more, with many interactions still poorly understood. Some scientists say too much focus is going to tipping points, and research should be going to the “radical uncertainty” of escalating extreme local events.

As Arctic melt sets early July record, hard times lie ahead for ice: Studies
- Arctic sea ice fell to its lowest extent on record for this time of year on July 5, even though the spring had so far been relatively cool and stormy — conditions that, in the past, would have protected the ice.
- Three new studies help explain why. One found that increasing air temperatures and intrusion of warm water from the North Atlantic into the Barents and Kara Seas — a climate change-driven process known as Atlantification — are overpowering the ice’s ability to regrow in winter.
- Another study found that sea ice in coastal areas may be thinning at up to twice the pace previously thought. In three coastal seas — Laptev, Kara, and Chukchi — the rate of coastal ice decline increased by 70%, 98%, and 110% respectively when compared to earlier models.
- A third study found accelerated sea ice loss in the Wandel Sea, pointing to a possible assault by global warming on the Arctic’s Last Ice Area — a last bastion of multi-year sea ice which stretches from Greenland along the Canadian Arctic Archipelago. Combined, this research shows Arctic ice may be in worse trouble than thought.

‘We are intimately connected with nature’: Q&A with oceanographer Kim McCoy
- The third edition of Waves and Beaches, published in March 2021 by Patagonia, examines the dynamic relationship between the sea and coast, blending lyrical prose with the theoretical study of beaches, waves and other oceanographic features.
- This new version of the book, which was published 57 years after the first edition, includes a discussion of how human-induced climate change is altering the dynamics between the sea and land, as well as the possible solutions to protecting coastlines against rising sea levels.
- The book was published as a collaboration between oceanographer Kim McCoy and the late Willard Bascom, the author of the first two editions, who acted as McCoy’s mentor in the years before his death in 2000.

Climate change isn’t fueling algal blooms the way we think, study shows
- A team of international researchers recently published the first global assessment of harmful algal blooms (HABs) — events in which toxic algae proliferate and cause harm to marine life and humans — based on nearly 10,000 recorded events between 1985 and 2018.
- The study found that there are no global trends that would suggest that climate change is having a uniform impact on HABs throughout the world, although this is a commonly held belief.
- The researchers were able to detect clearer regional trends that showed increases, decreases or no significant changes in HABs in certain parts of the world.
- It also found that there was a perceived increase in HABs amid the booming aquaculture industry, although the study does not necessarily suggest that aquaculture is causing an increase in HABs.

Absorbent and yellow and … mobile? Sea sponges on the move in Arctic Ocean
- A new study suggests that sea sponges are moving across the seafloor of the Arctic Ocean, which challenges the idea that these creatures are primarily immobile.
- Previous research has shown that sponges can make limited movements in a laboratory setting, but this is the first time sea sponge trails have been observed in the ocean and attributed to sponge movement.
- The researchers hypothesize that the sponges are moving to find food or disperse juveniles, although further research is needed before conclusions can be drawn.

Arctic biodiversity at risk as world overshoots climate planetary boundary
- The Arctic Ocean biome is changing rapidly, warming at twice the rate of the rest of the world. In turn, multiyear sea ice is thinning and shrinking, upsetting the system’s natural equilibrium.
- Thinner sea ice has led to massive under-ice phytoplankton blooms, drawing southern species poleward; fish species from lower latitudes are moving into the peripheral seas of the Arctic Ocean, displacing and outcompeting native Arctic species.
- Predators at the top of the food chain, such as polar bears, are suffering the consequences of disappearing ice, forced onto land for longer periods of time where they cannot productively hunt.
- The Central Arctic Ocean Fisheries Agreement has been signed by 10 parties to prevent unregulated commercial fishing in the basin until the region and climate change impacts are better understood by scientists. International cooperation will be critical to protect what biodiversity remains.

Ocean protection scheme can yield ‘triple benefits’ study says
- A new study suggests that carefully planned marine protected areas could yield triple benefits for the ocean, helping to maintain biodiversity, while also increasing fish yields and maximizing the ocean’s ability to sequester carbon in seafloor sediment.
- This study is one of the first to quantify the carbon footprint of ocean trawling, which it equates to the yearly emissions of the global aviation industry.
- The researchers suggest that the planning tools in this study could help inform discussions about how to protect 30% of the oceans by 2030, a goal that is expected to be adopted by the U.N. Convention on Biological Diversity later this year.
- Other proposals for how to achieve 30% protection by 2030 have mostly focused on the high seas, but this plan takes all parts of the ocean into consideration.

As Arctic sea ice hits annual maximum, concern grows over polar ice loss: Studies
- Arctic sea ice reaches its annual maximum extent in March. But while ice extent is high this year, scientists are far more concerned by the drastic loss of sea ice volume, which continues its steady decline.
- A new study has documented drastic ice loss in both the north and south polar regions; scientists found that the single biggest reduction came from Arctic sea ice — the Earth lost 7.6 trillion metric tons of it in the last three decades.
- Another new study shows that the last bastion of old, thick multiyear ice in the Arctic, north of Greenland and Ellesmere Island, is diminishing as the stability of the Nares ice arches declines — blockages which work like a cork in a bottle to stop multiyear ice from flowing out into the Atlantic.
- Meanwhile, researchers warn about the urgent need for new Arctic monitoring satellites. Currently there is just one in operation, the DMSP-F18 satellite, and it has already been in orbit more than a decade. Its failure could leave researchers blind and disrupt an Arctic ice database continuous back to 1978.

How technology can help us achieve at least 30% ocean protection (commentary)
- A growing number of countries are pledging to protect and conserve at least 30 percent of the ocean by 2030.
- Securing such a vast area requires new cutting-edge technology to monitor illegal activities and movements of species. Luckily, this field has been developing fast with new inventions and tech collaborations.
- The goal can be achieved by combining data from a range of sources, connecting the data to existing systems that rangers use, and engaging the people, communities, and sectors that work closely with the sea.
- This article is a commentary and the views expressed are those of the author, not necessarily Mongabay.

For marine life, human noise pollution brings ‘death by a thousand cuts’
- A new review critically examines the issue of human-made noise in the ocean, and how it can negatively impact the behavior, physiology and survival of marine animals.
- While most research on anthropogenic noise isn’t new, the problem has generally been ignored and not addressed in conservation policies, the authors say.
- Despite the severity of the issue, there are many practical solutions to mitigate anthropogenic noise in the ocean, according to the paper.

Brave New Arctic: Sea ice has yet to form off of Siberia, worrying scientists
- After a summer that saw record Siberian fires and polar temperatures topping 100 degrees Fahrenheit, along with near record low sea ice extent in September, the Arctic Ocean’s refreeze has slowed to a crawl.
- The Laptev Sea and East Siberian Sea are, at this point, failing to re-freeze as rapidly as in the past. Scientists see all of these worrying events, along with many other indicators including fast melting permafrost, as harbingers of a northern polar region that may be entering a new climate regime.
- Models predict the Arctic will be ice-free in summer by 2040 or 2050, with unforeseen negative impacts not only in the Far North, but on people, economies and ecosystems around the globe. One major concern: scientists worry how changes in the Arctic might alter temperate weather systems, impacting global food security.
- “We’re conducting this blind experiment, and we don’t yet know the real implications,” one sea ice researcher tells Mongabay. “How do you sell climate change to be as much of an emergency as COVID-19? Except that it will kill a lot more people.”

Arctic Sea ice melts to second-place finish at annual minimum
- At the annual September Arctic sea ice minimum this year, the ice extent was reduced to just 3.74 million square kilometers, a low that surpassed every year since 1979 except 2012, which saw a minimum of 3.41 million square kilometers.
- While 2012 was an anomaly (a year in which an immense August cyclone shattered the weakened ice), 2020 came very close to that record, but without any such storm, though the region did see intense July and August heat.
- A new study finds, once again, that what starts in the Arctic doesn’t stay there. Researchers say that Asia is seeing lengthier bouts of extreme storms, droughts, heat and cold as weather systems stall there, possibly due to a weakening Northern Hemisphere jet stream — an effect thought to be due to Arctic warming.
- In other new research, scientists say a layer of warm Atlantic water entering the Arctic, which had always stayed down deep in the past, is starting to rise toward, and mix with, colder surface waters. That mixing could be fatal to the Arctic sea ice in the future — with unknown, but potentially dire impacts on global climate stability.

Sharks are ‘functionally extinct’ in many global reef systems, study finds
- A new study surveyed 371 coral reefs in 58 countries, and found sharks were virtually absent from 20% of the surveyed reefs, indicating that they were functionally extinct from these ecosystems.
- The research team collected 15,165 hours of video via baited remote underwater video stations (BRUVS), and used this data to analyze shark abundance on global reef systems.
- The absence of sharks was usually connected to poor governance of nearby human settlements, including unregulated and destructive fisheries.
- While sharks were missing from many reefs around the world, other locations boasted healthy shark populations due to rigorous conservation efforts.

Siberian heat drives Arctic ice extent to record low for early July
- On June 17, 2020, a Siberian town registered a temperature of 100 degrees Fahrenheit, the highest ever recorded above the Arctic Circle. High temps across the region are driving impacts of great concern to scientists, firefighters, and those who maintain vulnerable Arctic infrastructure, including pipelines, roads, and buildings.
- The Siberian heat flowed over the adjacent Arctic Ocean where it triggered record early sea ice melt in the Laptev Sea, and record low Arctic sea ice extent for this time of year. While 2020 is well positioned to set a new low extent record over 2012, variations in summer weather could change that.
- The heat has also triggered wildfires in Siberia, releasing 59 million metric tons of carbon dioxide into the atmosphere in June and drying out the region’s tundra. Some blazes are known as “zombie fires” possibly having smoldered underground all winter between 2019 and 2020.
- Also at risk from the rapid rise in warmth is civil and militaryinfrastructure, built atop thawing permafrost. As Siberia heated up this year, a fuel tank at a Russian power plant collapsed, leaking 21,000 tons of diesel into the Ambarnaya and Dadylkan rivers, a major Arctic disaster. Worse could come as the world continues warming.

Scientists agree on the need to protect 30% of the seas. But which 30%?
- Scientists recommend protecting at least 30% of the ocean by 2030 to safeguard biodiversity, avoid fishery collapse and build ocean resistance to climate change.
- In 2018 and 2019, representatives from the United Nations were negotiating a high seas treaty to meet this goal through a network of marine protected areas (MPAs) throughout the open ocean, but the meeting meant to finalize the treaty in March was delayed due to COVID-19.
- Two reports were presented to show how to practically protect 30% of the ocean: one from a group of researchers from University of Oxford, the University of York and Greenpeace, and the other from the University of California, Santa Barbara, and other universities and institutions.
- The two reports used different methodologies and had slightly different results, but they also showed considerable overlap in their recommendations of safeguarding certain areas of biological and ecological importance.

Climate conundrum: Could COVID-19 be linked to early Arctic ice melt?
- The COVID-19 pandemic has yielded unexpected environmental benefits, as wildlife explore urban streets and 2020 carbon emissions drop by the largest amount since World War II. But now researchers are wondering if a record hot and sunny start to the Arctic sea ice melt season could be linked to the Coronavirus lockdown.
- The possible cause: a reduction in atmospheric sulphate aerosol pollutants emitted by factories, ships and other sources. Sulphate aerosols increase the amount of clouds and brighten the atmosphere, reflecting more solar heat, thus masking global warming intensity — and making the Arctic cloudier and colder.
- Scientists are working to determine if, and by how much, sulphate aerosols have declined due to the industrial slowdown brought by the COVID-19 pandemic.
- These figures could help them more precisely determine how aerosols have been inhibiting atmospheric heating around the world, especially in the Arctic. One study found that sulphate aerosol-seeded clouds could be masking about a third of all warming from greenhouse gases. However, the question is far from settled.

Vanishing sea ice in the Arctic could shake up seabird migrations
- Researchers have developed a framework to aid in understanding the changes to seabird migration that could result from the loss of Arctic sea ice due to climate change.
- The team found that one species, the little auk, would expend about half as much energy by shifting its migration from the North Atlantic to the North Pacific, rather than their traditional migration or if they just stayed put in the high Arctic.
- The team also mined the scientific literature and found 29 bird species with the potential for a similar shift in their migratory routes.

Svalbard reindeer rebounding better than hoped after nearly going extinct
- The wild Svalbard reindeer (Rangifer tarandus platyrhynchus) seems to be on the path to recovery following near extinction in the early 20th century.
- Now, some 22,000 Svalbard reindeer are estimated to occur across the islands, a population size that’s about twice as high as a previous estimate based on opportunistic counts from 1968 to 2008, a new study has found.
- The latest estimates also show that the Svalbard reindeer now occupies its entire historical range across Svalbard; areas from where the reindeer was once wiped out by hunting have the potential to support more animals, the researchers estimate.
- While Svalbard reindeers are doing better than many of their cousins, the subspecies’ recovery could be under threat from human-induced climate change.

Shrinking sea ice in the Arctic opens new pathways for animal disease
- Scientists have discovered that periods of minimal sea ice in the Arctic between 2001 and 2016 were followed by spikes in a deadly disease that affects seals, sea lions and sea otters.
- The team used satellite imagery showing decreases in sea ice combined with GPS collar data tracking animal movements over the 15-year study period.
- After periods of sea ice contraction, the odds that a sampled animal would be affected by the disease were more than nine times higher than typical years.

The Arctic and climate change (1979 – 2019): What the ice record tells us
- This story has been updated: 2019’s Arctic ice melt season started out with record heat and rapid ice loss. Though cooler weather prevailed in August, stalling the fall, by mid-September ice extent was dropping dramatically once again. Then this week, 2019 raced from fourth to second place — now behind only 2012, the record minimum.
- With 2019 providing no reversal over past years, scientists continue to document and view the Arctic Death Spiral with increasing alarm. This story reviews the 40-year satellite record, along with some of the recent findings as to how Arctic ice declines are impacting the global climate.
- Researchers are increasingly certain that melting ice and a warming Arctic are prime factors altering the northern jet stream, a river of air that circles the Arctic. A more erratic jet stream — with increased waviness and prone to stalling — is now thought to be driving the increasingly dire, extreme global weather seen in recent years.
- The 40-year satellite record of rapidly vanishing Arctic ice — as seen in a new NASA video embedded within this article — is one of the most visible indicators of the intensifying climate crisis, and a loud warning to world leaders meeting at the UN in New York next week, of the urgent need to drastically cut carbon emissions.

2019 in line for second lowest Arctic sea ice extent record
- 2019 has seen constant heat and melt conditioning of the Arctic sea ice, resulting in record, and near record, daily and monthly extent and volume stats over much of the melt season. The average volume for July, for example, fell to 8,800 cubic kilometers (2,111 cubic miles), a new record low.
- Whether 2019 will set a new all-time extent or volume record at the September sea ice minimum remains to be seen, with ice extent shrinking less quickly since mid-August, possibly putting this year in second place, though certainly among the top five record lowest minimums.
- The big news this year was the relentless heat in the Arctic, with record heat waves over Alaska, Scandinavia and Greenland, resulting in massive glacial runoff into the sea. Wildfires were rampant, with reindeer and fish including salmon possibly adversely impacted by very hot air and water temperatures.
- Whether or not 2019 sets a new sea ice extent or volume low record this September is incidental. What this year dramatically showed is that the climate crisis has anchored itself firmly in the Arctic, and shows no signs of easing over the long-haul.

Arctic in free fall: 2019 sea ice volume sinks to near record for June
- High temperatures and relentless sun caused Arctic sea ice volume and extent to plummet this June.
- The June 2019 monthly average for Arctic sea ice volume was 15,900 cubic kilometers (3,814 cubic miles), just short of the monthly average record set in 2017. But by the end of the month this year, a new daily record occurred as volume loss advanced rapidly, leaving just 12,047 cubic kilometers (2,890 cubic square miles) of sea ice on June 30 — that’s 106 cubic kilometers (25 cubic miles) lower than the previous record for this time of year.
- On July 10, Arctic sea ice extent for 2019 fell to 8.338 million square kilometers (3.219 million square miles), surpassing 2012’s record low of 8.359 million square kilometers (3.227 million square miles) for this time of year.
- While changing weather always dictates sea ice minimum extent and volume in September, scientists say that if conditions remain favorable for melt and ice export to the North Atlantic, then 2019 could beat all records. And because what happens in the Arctic doesn’t stay there, that could mean trouble for the world’s weather.

Arctic sea ice extent just hit a record low for early June; worse may come
- The lowest Arctic sea ice extent in the 40-year satellite record for this time of year was set on June 10 with just 10.901 million square kilometers of ice remaining, dipping just below the previous record set in 2016 of 10.919 million square kilometers. This year’s record is likely to deepen at least for the coming days.
- Some scientists theorize that declining Arctic summer sea ice extent, which has fallen by roughly half since 1979, could be generating a cascade of harmful effects: as the Arctic melts, the heat differential between the Far North and temperate zone lessens, causing the jet stream (high altitude Northern Hemisphere winds), to falter.
- As the polar jet stream loses energy, it can fail to hug the Arctic Circle. Instead it starts to dip deeply into the temperate zone forming great waves which can block and stall weather patterns there, bringing long punishing bouts of rain and floods like those seen in the Midwest this spring, or extended heatwaves and drought.
- Arctic weather variations are too complex to predict in advance, but 2019 has made a strong start toward possibly beating 2012 for the lowest annual ice extent record. Records aside, the Arctic sea ice death spiral and the extreme weather it can trigger are adversely impacting agriculture, infrastructure, economics and human lives.

Arctic in trouble: Sea ice melt falls to record lows for early April
- As of April 9, the Arctic had around 13.6 million square kilometers (5.3 million square miles) of ice cover, putting it firmly below any other year on record for the same time of year, and nearly two weeks ahead of previous early April records set in 2017 and 2018.
- The implications of such low sea ice extent for this time of year is concerning to scientists. However, predicting seasonal ice melt is very difficult, and changes in Arctic weather could cause the early melt to stall, or even reverse to some degree.
- Two new Arctic studies are also troubling. Researchers have found that between 1998 and 2017, seventeen percent less ice exited shallow continental shelf seas — nurseries for sea ice — to reach the Central Arctic Ocean and Fram Strait. This loss in ice being transported could have serious implications for Arctic sea ice melt and impact biodiversity as well.
- A second study found that rising Arctic air temperatures are driving change across the entire ecosystem. Hotter temperatures are impacting forest and tundra growing seasons, increasing wildfires, boosting rain and snowfall, and melting ice — shifting the region from its 20th century condition into an unprecedented state.

As Arctic neared 2019 winter max, Bering Sea was virtually ice-free
- Though yet to be called officially by scientists, Arctic sea ice extent appeared to hit its annual maximum on March 13 when it covered 14.777 million square kilometers. The 2019 max stats are among the top ten lowest on record, and well below the 1981-2010 average maximum extent of 15.64 million square kilometers.
- One thing that stood out this winter was the extraordinarily low amounts of ice in the Bering Sea at the start of March, surpassing record lows seen in 2018 for the same dates. Seasonal ice in the Bering Sea is already known to be volatile, but it’s getting worse under climate change.
- A new study also found something remarkable on the opposite side of the Arctic: in recent years, according to the research, Greenland has been receiving more rain, including in winter.
- These rain events are triggering sudden, rapid ice melt and are responsible for a tremendous amount of annual runoff. Ultimately, these rains could prove catastrophic for the Greenland ice sheet, and for sea level rise.

Agreement bans commercial fishing across much of the Arctic, for now
- Nine jurisdictions — Canada, Norway, Russia, the U.S., China, Iceland, Japan, South Korea, Denmark (including Greenland and the Faroe Islands) and the European Union — have signed a legally binding agreement that bans commercial fishing in the high seas portion of the Central Arctic Ocean, covering 2.8 million square kilometers, or an area about the size of the Mediterranean Sea, for at least 16 years.
- As part of the agreement, the signatory parties have committed to a joint scientific research and monitoring program to gain a better understanding of the changing Arctic ecosystem and determine the region’s potential for commercial, sustainable fisheries in the future.
- The moratorium will initially cover 16 years, but this can be extended in five-year increments, if the parties agree to do so.

Taking it slow can help reduce impacts of Arctic shipping on whales (commentary)
- Thanks to climate change, traveling through the Northwest Passage is quickly becoming an exotic option for cruise ship passengers — and an enticing shortcut for cargo ships.
- But an increasingly ice-free Arctic means more than just a chance for a new sightseeing adventure: Significantly increased ship traffic is altering the submarine calm of one of the quietest places on Earth. That could have serious implications for marine mammals and fish that rely on sound for group cohesion, socializing, finding mates, navigating, and detecting threats.
- As we grow sensitive to plastics and other toxins that plague ocean species, we must remember that while noise is the one form of pollution that we cannot see, we can work together to turn down the volume.
- This post is a commentary. The views expressed are those of the author, not necessarily Mongabay.

Ice-free passage for ships through the Arctic could cause problems for marine mammals
- A new study suggests that increased ship traffic in the Arctic, as ice there melts due to climate change, could disturb marine mammal species.
- In their assessment of 80 subpopulations living along the Northwest Passage and Russia’s Northern Sea Route, 42 are likely to be affected by a greater number of commercial ships, researchers found.
- The team suggests that mitigation measures, such as those employed in other parts of the world to protect North Atlantic right whales, could be effective.

2018 Arctic sea ice melt season just got a big headstart
- This Spring, Arctic sea ice extent nearly achieved a new record low for May, but instead came in at second place at 12.2 million square kilometers (4.7 million square miles). That’s 310,000 square kilometers (120,000 square miles) greater than the all time May record set in 2016.
- While scientists and the media have focused in the past mostly on the September sea ice extent minimum, four years in a row of record winter Arctic heatwaves, along with a better understanding of ice melt mechanisms, has resulted in researchers putting much more attention on Spring events as the annual melt season gets underway.
- It is now understood that shrinking Arctic sea ice extent is having a significant influence on the global climate system, but extent isn’t all researchers are watching. They are becoming more and more concerned about the quality of the sea ice at the start of each melt season – thickness, as well as the disappearance of large amounts of multiyear ice.
- Thinner, more fractured ice, and more numerous Spring melt ponds make the Arctic ice more vulnerable to summer heatwaves and a warmer Arctic Ocean. As with May, June 2018 has so far seen rapid ice melt, with extent lagging only slightly behind the record set in June 2016. That doesn’t bode well for the September sea ice extent minimum.

Audio: Bowhead whales in the Arctic sing hundreds of complex songs
- Scientists have recorded 184 elaborate, very different bowhead whale songs in a bowhead subpopulation living east of Greenland. This makes it the largest set of bowhead whale song recordings ever.
- The bowhead’s vocal repertoire is rivaled only by a few species of songbirds, researchers say.
- But why these whales have so many different song types and why they change their songs each year is still a mystery.

Beyond polar bears: Arctic animals share in vulnerable climate future
- The media has long focused on the impacts of climate change on polar bears. But with Arctic temperatures rising fast (this winter saw the warmest October to February temperatures ever recorded), a wide range of Arctic fauna appears to be at risk, though more studies are needed to determine precise causes, current effects on population, and future projections.
- Diminishing Arctic snow, especially in the spring, may leave wolverines without ideal places to den. Caribou and reindeer populations have been in serious decline due to natural population fluctuation, but scientists don’t know if their numbers will recover under changed climate conditions.
- Lemmings are also being impacted by diminishing snow, often leaving the rodents without cover in spring and autumn. Their decline could impact the predators that prey on them, including Arctic foxes, red foxes, weasels, wolverines, and snowy and short-eared owls.
- Snowy owls have raised concerns because the seabirds they hunt in winter, which congregate around small holes in the Arctic ice, could become more widely dispersed in broader stretches of open water and therefore be harder to prey on. Scientists say more study of Arctic wildlife is urgently needed, but funding and media attention remains sparse.

2017’s top 10 ocean news stories
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2017.
- Huge new ocean protected areas and steps toward an international treaty to protect the high seas brought hope.
- Meanwhile, the U.S.’s decision to drop out of the Paris Agreement to reduce greenhouse gas emissions, and an intensely destructive Atlantic hurricane season spotlighted the unfolding threat of climate change.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.

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