The Arctic ‘locked-in’ for 3 to 5 °C temperature rise, UN report warns

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Sea ice in Arctic Canada, in 2008. The Arctic is facing multiple pressures and drivers of change
from both inside and outside the region, according to a new United Nations report. (Jonathan Hayward/The Canadian Press)
Winter temperatures in the Arctic are set to rise by 3 to 5 C by 2050 even if the world succeeds in cutting emissions in line with the Paris Agreement, according to a new report by the United Nations.

These temperatures are set rise even higher – up to 9 C –  by 2080, bringing devastating changes to the region and triggering sea level rises worldwide, the report by UN Environment finds.

Further warming may also surpass tipping points for the stability of the Greenland ice sheet, as well as the rapidly melting permafrost, which could release large amounts of carbon into the atmosphere and derail efforts to meet global greenhouse gas emission goals.

Other possible tipping points are related to increased fresh water input or ocean acidification, with direct impacts on ocean circulation and ecosystems, warns the report titled Global Linkages – A graphic look at the changing Arctic.

“What happens in the Arctic does not stay in the Arctic,” said in a statement Joyce Msuya, UN Environment’s Acting Executive Director. “We have the science; now more urgent climate action is needed to steer away from tipping points that could be even worse for our planet than we first thought.”

Even if all carbon emissions were to be halted immediately, winter temperatures in the Arctic would still increase 4 to 5 C by the end of the 21st century compared to the late 20th century, the study finds. That’s because of greenhouse gases already emitted and stored in the world oceans.

Source: UN Environment

But it’s not just about reducing carbon emissions.

“Longer-term efforts to transition to low-carbon economies, both in the Arctic and globally, must be complemented by instant measures to reduce Short-Lived Climate Pollutants (SLCP), including methane, tropospheric ozone and black carbon,” the study says. “Immediately controlling SLCPs across the world could cut the rate of warming in the Arctic by up to two-thirds by mid-century.”

The report warns that Arctic societies, especially Indigenous Peoples who already face increased food insecurity, must prepare for what’s coming with suitable adaptation actions.

By mid-century nearly four million people, and about two-thirds of today’s Arctic infrastructure, will be threatened by thawing permafrost, the report warns.

Global impacts
Source: UN Environment

The Arctic region has a significant impact on the global climate and there are strong feedback mechanisms between the Arctic and the rest of the world, the study says.

From 1979 to the present, Arctic sea ice is estimated to have declined by 40 per cent. Climate models predict that, at the current rate of carbon dioxide emissions, Arctic summers will be ice-free by the 2030s, according to the report.

“Global emissions drive the melting of ice caps and glaciers, significantly contributing to rising sea levels, which will affect coastal and island communities throughout the world,” the report says.

The melting of the Greenland ice cap and Arctic glaciers contribute to one third of sea level rise worldwide.

The slightest change in temperature can have a substantial effect on the fragile ecosystems in the Arctic, which is home to over 21,000 species of plants, fungi, mammals, birds, fish, insects and invertebrates, the report says.

“This makes climate change the most serious threat to biodiversity in the Arctic.”

Ocean acidification is another threat
A 2006 file photo of the Arctic Ocean near Alaska. Since the beginning of the industrial revolution, the world’s ocean has become 30 per cent more acidic, according to a new report by the UN.
(Beth Ipsen/Arctic Sounder/AP/The Press Canadian)

Growing ocean acidification is another factor impacting Arctic marine species.

“The increase in ocean CO2 has caused average ocean surface acidity to increase by 30 per cent since the beginning of the industrial revolution,” the report said.

“Lower pH levels can affect life in the ocean: for example, sea creatures like corals, molluscs, sea urchins and plankton build their shells and skeletons from aragonite, a carbonate mineral. This mineral becomes less available when pH levels of seawater fall, meaning these creatures need more energy to build their shells.”

Far from pristine
The “KV Nordkapp” crew collect plastic waste on Kiepertøya on Svalbard. (Norwegian Coast Guard)

Despite its pristine image in the popular imagination, the Arctic’s geographical characteristics and cold climate mean the region’s ocean, seafloor and coastline are a sink for contaminants from around the globe, the report says.

Only 1,000 out of the 150,000 chemical substances in use worldwide are regularly monitored. A global approval system for new chemicals is therefore needed, the report argues.

Alternative controls are also seen as necessary for chemicals that fall outside of existing treaties.

The report notes, however, that amount of regulated chemicals in humans and animals living in the Arctic was found to be decreasing. These include some Persistent Organic Pollutants (POB) regulated under UN Environment’s Stockholm Convention. However, the decrease could be due to changing diets, the report speculates.

The report also warns of other threats such as plastic pollution, invasive species and new diseases appearing in the region.

Related stories from around the North:

Canada: Theoretical physicist helping scientists understand how glaciers flow, CBC News

Finland: Climate change, birth rate should be Finnish gov’s top priorities: report, Yle News

Greenland: Climate change could unleash Greenland sand bonanza, say researchers, Eye on the Arctic

New Zealand: New Zealand glaciers on the retreat, Deutsche Welle’s Ice-Blog

Norway: New climate report predicts extreme warming for Arctic Svalbard by 2100, The Independent Barents Observer

Russia: Russia’s quest for Arctic resources unhindered by climate crisis, The Independent Barents Observer

Sweden: Glacier in central Sweden “collapsing” as climate warms, Radio Sweden

United States: Increasing ocean acidification ushering era of uncertainty for Arctic, says report, Eye on the Arctic

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Levon Sevunts

Levon Sevunts, Radio Canada International

Born and raised in Armenia, Levon started his journalistic career in 1990, covering wars and civil strife in the Caucasus and Central Asia. In 1992, after the government in Armenia shut down the TV program he was working for, Levon immigrated to Canada. He learned English and eventually went back to journalism, working first in print and then in broadcasting. Levon’s journalistic assignments have taken him from the High Arctic to Sahara and the killing fields of Darfur, from the streets of Montreal to the snow-capped mountaintops of Hindu Kush in Afghanistan. He says, “But best of all, I’ve been privileged to tell the stories of hundreds of people who’ve generously opened up their homes, refugee tents and their hearts to me.”

One thought on “The Arctic ‘locked-in’ for 3 to 5 °C temperature rise, UN report warns

  • 22 March 2019 at 23 h 54 min
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    *Return the missing micro-organisms that make soil function globally and we will sequester all of the carbon in the atmosphere.
    Refer to Elaine Ingham Soil Food Web
    Compost and Compost Tea- properly made compost tea could be sprayed out of every aeroplane that takes flight to put back the missing micro-organisms that make soil function.
    *Redesign the landscape with swales on contour and Keyline design to slow spread and sink water to rehydrate our earth, stop draining our rain to the oceans and hold it on the land. There are millions of machines on the planet being used destructively, make there use constructive.
    Refer to Geoff Lawton and P A Yeoman’s Australia
    *Install leaky weirs, chains of ponds and slow meanders in our creeks and rivers to lift the water level
    Refer to Peter Andrews Australia
    *Holistic grazing
    Refer to Allan Savory Africa
    Immediately cease using all products that are not natural that destroy the function of the soil, cease tillage and return all animals to the natural system where they belong.
    Permaculture has the natural answers to food and water security.
    The solutions are quite simple really.
    It is the soil and what animals we have left that can save us.
    The knowledge is there, the results are on the ground all around the globe.
    There is absolutely no time to waste, global action is required.

    Reply

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