
By Jeremy Deaton
You may have heard about the hole in the ozone layer, which hovers over Antarctica. It has shrunk over time thanks to policies that curbed the use of ozone-depleting chemicals. In the nearly 40 years that NASA has kept track, it has never been smaller. That's the good news.
The bad news is that a separate hole in the ozone layer briefly opened up in the Arctic in March before closing in April, and climate change may be partly to blame.
This isn't the first such rift to develop in the Arctic, but it is the largest. Scientists say that in March, a stratospheric polar vortex — a band of strong, frigid winds circling the pole — corralled chlorine and bromine that chewed away at the ozone layer. Scientists said that climate change may have set the stage for a colder, and thus more powerful, polar vortex.
"In those years when a vortex can spin and set itself up and be undisturbed, it's getting colder and colder," said Ross Salawitch, a climate scientist at the University of Maryland. Cold air strengthens polar vortexes, allowing them to deal more damage to the ozone layer, he said.
This year's Arctic polar vortex was unusually strong and long-lived, helping to deplete the ozone layer. At the same time, currents that would normally deliver ozone from surrounding areas were stagnant. The bruising was far less severe than what is typically seen over the South Pole, though. At the South Pole, stratospheric polar vortexes are reliably strong thanks to the extreme cold, so the ozone layer regularly thins.
In a stratospheric polar vortex, high-altitude clouds form from trace gasses in the atmosphere. Pollutants containing chlorine and bromine are essentially benign until they run into one of these clouds. Then they transform into chemicals capable of terrorizing the ozone layer.
They still need sunlight to do their dirty work, however. That comes at the start of spring —around September in the Southern Hemisphere and around March in the Northern Hemisphere. As the days get longer, these chemicals react with sunlight to deplete stratospheric ozone.
Because Antarctica is so isolated from the rest of the world, a strong polar vortex can form undisturbed. That's not the case in the Arctic, where the mix of land and water surrounding the North Pole produces more dynamic weather that can weaken or disrupt a polar vortex.
Polar stratospheric clouds activate the chemicals that deplete the ozone layer. NASA
Ozone holes rarely form at the North Pole — the last one appeared in 2011 — and they are typically short-lived. But what happens in the Arctic does not stay in Arctic. As a result of the damage, the ozone layer is now a little thinner everywhere else. While it will repair itself over time, the recent polar vortex has likely slowed the recovery.
At the South Pole, the ozone layer tears open yearly. Scientists first discovered the Antarctic ozone hole in 1985. Researchers determined that it was caused by chemicals containing chlorine and bromine. These include chlorofluorocarbons, which are found in air conditioners, refrigerators and spray cans, halons, which are found in fire extinguishers, and methyl bromide, which is used to kill weeds, insects and other pests. The discovery was met with alarm, as the ozone layer filters out dangerous ultraviolet radiation, helping to sustain life on Earth.
"If there was no ozone layer, the ultraviolet radiation would sterilize the Earth's surface," said Paul Newman, chief scientist for earth sciences at NASA's Goddard Space Flight Center. "Crop yields go down as ultraviolet exposure goes up." In humans, ultraviolet radiation can cause skin cancer and cataracts, and can weaken the immune system.
To restore the ozone layer, in 1987, countries adopted the Montreal Protocol to stem the use of ozone-depleting chemicals. It worked. Over time, the hole grew smaller and smaller, and the ozone layer began to heal. By the middle of this century, scientists expect it will be fully restored.
While many Americans mistakenly believe that the hole in the ozone layer is driving climate change, it may be that the reverse is true — that climate change is harming the ozone layer.
Carbon pollution is acting like a blanket, trapping heat in the lower atmosphere. As a result, it is both warming the surface of the Earth and preventing heat from reaching the upper atmosphere. As such, the lower atmosphere is warming, while the upper atmosphere is actually cooling. Polar vortexes grow stronger in the cold, producing more of the high-altitude clouds that activate the chemicals that eat up the ozone layer.
"The temperatures in the stratosphere will probably be decreasing somewhat, and so that may slow down the recovery of the ozone layer," Manney said. "We have this situation in the Arctic, where we have had a couple of winters in the last couple of decades that have been much colder than usual."
Newman believes that falling temperatures will do little to deplete the ozone layer, however. He is more concerned with how climate change will alter currents that replenish Arctic ozone or break up the Arctic polar vortex.
"We don't really see a strong cooling of the Arctic stratosphere," he said. "The question in my mind is rather, 'What is the impact of climate change on these large-scale weather systems?'"
Salawitch said that it is difficult to determine what, exactly, the future holds for the ozone layer in the Arctic. Models disagree as to how much or how fast temperatures will change at the North Pole, or what that means for the polar vortex. As such, some say Arctic ozone will continue to thin, while others project a speedy recovery.
Scientists emphasized that the recent ozone hole in the Arctic would have been substantially worse had countries not taken steps to curb pollution. They said the episode speaks to the importance of the Montreal Protocol.
"We do have to keep in mind that the Montreal Protocol was very successful in getting the world to stop emitting these chlorofluorocarbons. The ozone layer is starting to recover," Manney said. "It's a remarkable success story."
Reposted with permission from Nexus Media.
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The Great Trail in Canada is recognized as the world's longest recreational trail for hiking, biking, and cross-country skiing. Created by the Trans Canada Trail (TCT) and various partners, The Great Trail consists of a series of smaller, interconnected routes that stretch from St. John's to Vancouver and even into the Yukon and Northwest Territories. It took nearly 25 years to connect the 27,000 kilometers of greenway in ways that were safe and accessible to hikers. Now, thanks to a new partnership with the Canadian Paralympic Committee and AccessNow, the TCT is increasing accessibility throughout The Great Trail for people with disabilities.
Trans Canada Trail and AccessNow partnership for AccessOutdoors / Trails for All project. Mapping day at Stanley Park Seawall in Vancouver, British Columbia with Richard Peter. Alexa Fernando
<p>This partnership also comes at a time when access to outdoor recreation is more important to Canadian citizens than ever. <a href="https://www150.statcan.gc.ca/n1/daily-quotidien/200527/dq200527b-eng.htm" target="_blank" rel="noopener noreferrer">Studies from the spring of 2020</a> indicate that Canadian's <a href="https://www.bnnbloomberg.ca/moneytalk-mental-health-during-covid-19-1.1567633" target="_blank" rel="noopener noreferrer">mental health has worsened</a> since the onset of social distancing protocols due to COVID-19. </p><p>The <a href="https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/safe-activities-during-covid19/art-20489385" target="_blank" rel="noopener noreferrer">Mayo Clinic</a> lists hiking, biking, and skiing as safe activities during COVID-19. Their website explains, "When you're outside, fresh air is constantly moving, dispersing these droplets. So you're less likely to breathe in enough of the respiratory droplets containing the virus that causes COVID-19 to become infected."</p><p>TCT leadership took this into consideration when embarking on the accessibility project. McMahon explains that there has never been a more important time to bring accessibility to the great outdoors: "Canadians have told us that during these difficult times, they value access to natural spaces to stay active, take care of their mental health, and socially connect with others while respecting physical distancing and public health directives. This partnership is incredibly important especially now as trails have become a lifeline for Canadians."</p><p>Together, these organizations are paving the way for better physical and mental health among all Canadians. To learn more about the TCT's mission and initiatives, check out their <a href="https://thegreattrail.ca/stories/" target="_blank">trail stories</a> and <a href="https://thegreattrail.ca/wp-content/uploads/2021/01/TCT_2020-Donor-Impact-Report_EN_8.5x14-web.pdf" target="_blank">2020 Impact Report</a>.</p>EcoWatch Daily Newsletter
By Kiyoshi Kurokawa and Najmedin Meshkati
Ten years ago, on March 11, 2011, the biggest recorded earthquake in Japanese history hit the country's northeast coast. It was followed by a tsunami that traveled up to 6 miles inland, reaching heights of over 140 feet in some areas and sweeping entire towns away in seconds.
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Nuclear power generates about 10% of the world's electricity (TWh = terawatt-hours). About 50 new plants are under construction, but many operating plants are aging. World Nuclear Association / CC BY-ND
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Author Najmedin Meshkati holding an earthquake railing in a Fukushima Daiichi control room during a 2012 site visit. Najmedin Meshkati / CC BY-ND
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"Watch. Connect. Take Action."
These words are the invitation and mandate of the WaterBear Network, a free film-streaming platform that launched in November of 2020. Its goal is to turn inspirational images of the natural world into actions to save it.
WaterBear CEO Ellen Windemuth uses films to inspire planet-positive actions. WaterBear
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By Kenny Stancil
Amid the ongoing climate emergency and the devastating coronavirus pandemic that has resulted in more than 500,000 deaths in the U.S. alone as well as an economic meltdown that has left millions of people unemployed, the Sunrise Movement on Thursday launched its "Good Jobs for All" campaign to demand that lawmakers pursue a robust recovery that guarantees a good job to anyone who wants one and puts the country on a path toward a Green New Deal.
<div id="c7fe3" class="rm-shortcode" data-rm-shortcode-id="5664692fdfd187db01eff5ac2787c564"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1367650177436311562" data-partner="rebelmouse"><div style="margin:1em 0">We’re coming together to fight for each other and guarantee #GoodJobsForAll Join us: https://t.co/MoJhmlzoaS https://t.co/IAPa8DeeLR</div> — Sunrise Movement 🌅 (@Sunrise Movement 🌅)<a href="https://twitter.com/sunrisemvmt/statuses/1367650177436311562">1614908186.0</a></blockquote></div>
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bpperry / Getty Images
By Tara Lohan
Each year the amount of plastic swirling in ocean gyres and surfing the tide toward coastal beaches seems to increase. So too does the amount of plastic particles being consumed by fish — including species that help feed billions of people around the world.
Blue shark at Cape Point, South Africa, 2016. Steve Woods / CC BY-NC-ND 2.0