New report finds that impacts of ozone-driven climate change span the ecosystem
Increased solar radiation penetrating through the damaged ozone layer is interacting with the changing climate, and the consequences are rippling through the Earth’s natural systems, effecting everything from weather to the health and abundance of sea mammals like seals and penguins.
These findings were detailed in a review article published today in Nature Sustainability by members of the United Nations Environment Programme’s Environmental Effects Assessment Panel, which informs parties to the Montreal Protocol.
“What we’re seeing is that ozone changes have shifted temperature and precipitation patterns in the southern hemisphere, and that’s altering where the algae in the ocean are, which is altering where the fish are, and where the walruses and seals are, so we’re seeing many changes in the food web,” said Kevin Rose, a researcher at Rensselaer Polytechnic Institute who serves on the panel and is a co-author of the review article.
The 1987 Montreal Protocol on Substances that Deplete the Ozone Layer — the first multilateral environmental agreement to be ratified by all member nations of the United Nations — was designed to protect Earth’s main filter for solar ultraviolet radiation by phasing out production of harmful manmade substances, such as the chlorofluorocarbons class of refrigerants. The treaty has largely been considered a success, with global mean total ozone projected to recover to pre-1980 levels by the middle of the 21st century. Earlier this year, however, researchers reported detecting new emissions of ozone depleting substances emanating from East Asia, which could threaten ozone recovery.
While ozone depletion has long been known to increase harmful UV radiation at the Earth’s surface, its effect on climate has only recently become evident. The report points to the Southern Hemisphere, where a hole in the ozone layer above Antarctica has pushed the Antarctic Oscillation — the north-south movement of a wind belt that circles the Southern Hemisphere — further south than it has been in roughly a thousand years. The movement of the Antarctic Oscillation is in turn directly contributing to climate change in the Southern Hemisphere.
As climate zones have shifted southward, rainfall patterns, sea-surface temperatures, and ocean currents across large areas of the southern hemisphere have also shifted, impacting terrestrial and aquatic ecosystems. The effects can be seen in Australia, New Zealand, Antarctica, South America, Africa, and the Southern Ocean.
In the oceans, for example, some areas have become cooler and more productive, where other areas have become warmer and less productive.
Warmer oceans are linked to declines in Tasmanian kelp beds and Brazilian coral reefs, and the ecosystems that rely on them. Cooler waters have benefitted some populations of penguins, seabirds, and seals, who profit from greater populations of krill and fish. One study reported that female albatrosses may have become a kilogram heavier in certain areas because of the more productive cooler waters linked to ozone depletion.
Rose also pointed to subtler feedback loops between climate and UV radiation described in the report. For example, higher concentrations of carbon dioxide have led to more acidic oceans, which reduces the thickness of calcified shells, rendering shellfish more vulnerable to UV radiation. Even humans, he said, are likely to wear lighter clothes in a warmer atmosphere, making themselves more susceptible to damaging UV rays.
The report found that climate change may also be affecting the ozone layer and how quickly the ozone layer is recovering.
“Greenhouse gas emissions trap more heat in the lower atmosphere which leads to a cooling of the upper atmosphere. Because ozone is depleted at colder temperatures, the colder upper atmosphere is slowing the recovery of the ozone layer,” Rose said.
As one of three scientific panels to support the Montreal Protocol, the Environmental Effects Assessment Panel focused in particular on the effects of UV radiation, climate change, and ozone depletion. Thirty-nine researchers contributed to the article, which is titled “Ozone depletion, ultraviolet radiation, climate change and prospects for a sustainable future.” Rose, an aquatic ecologist, serves on the aquatic ecosystems working group, which is one of seven working groups that are part of the panel.
The Latest on: Climate change feedback loop
via Google News
The Latest on: Climate change feedback loop
- Siberian heatwave that has seen temperatures hit 100F in one Arctic town is a 'warning sign of major proportions', climate scientists claimon June 24, 2020 at 6:58 am
Thermometers in the town of Verkhoyansk in Russia's Sakha Republic reached a peak of 32°F (18°C) above the normal level for this time of year on June 20, 2020.
- The Arctic is on fire: Siberian heat wave alarms climate scientistson June 24, 2020 at 3:54 am
Moscow — The Arctic is feverish and on fire — at least parts of it are. And that’s got scientists worried about what it means for the rest of the world. The thermometer hit a likely record of 38 ...
- Siberian heatwave alarms climate scientistson June 24, 2020 at 1:05 am
Scientists have expressed concerns about the implications for the rest of the world after a heatwave in Russia’s Siberia region. On Saturday, the thermometer hit a likely record of 38C – or 100.4 ...
- A Siberian town near the Arctic Circle just recorded a 100-degree temperatureon June 21, 2020 at 12:45 pm
Temperatures have jumped in recent months to levels rarely seen in the Russian region, and it’s a sign of a broader trend of human-caused climate ... fuels and feedback loops, the Arctic is ...
- Arctic records its hottest temperature everon June 21, 2020 at 12:41 pm
Due to heat trapping greenhouse gases that result from the burning of fossil fuels and feedback loops, the Arctic ... one way to dampen the impact of climate change and that is to stop burning ...
- Humans a more immediate threat to large river systems than climate changeon June 19, 2020 at 11:44 pm
Climate change promises to disrupt a variety of natural systems across the globe, but new research suggests human activities pose a more immediate threat to the planet's largest river systems.
- Positive feedback loops, negative trendson June 19, 2020 at 12:47 am
Pandemics and climate change share the property of being driven by positive feedback loops.For pandemics, the more people who acquire a disease, the more ...
- Oil spills, wildfires, invasive insects… Siberia’s climate change vicious circleon June 16, 2020 at 8:45 am
On May 29, 21,000 tons of diesel fuel from the storage tank of a thermal power station in Siberia spilled onto the icy tundra and into rivers in one of the worst environmental disasters the Russian ...
- In New York State the grid (not grill) just got cleaneron June 15, 2020 at 10:58 pm
In other words, we have a perfect climate change “feedback loop.” Indeed, in May 2020, CO2 levels in Earth’s atmosphere reached 417 parts per million, a level not seen for about 3 million ...
- Melting Arctic Could Supercharge Climate Feedback Loopon June 12, 2020 at 5:00 pm
As global warming heats the Arctic, carbon dioxide emissions from melting permafrost could play a bigger role in worsening climate change than ... as a climate “feedback” loop.
via Bing News