High carbon dioxide emissions are causing many problems for humanity as they intensify the greenhouse effect. As a consequence, temperatures rise and the poles melt, which in turn could endanger many lives.
One of the areas being studied is Alaska, specifically the tundra. Since 1975, the amount of CO2 emitted due to melting ice has increased by 70% , according to the National Aeronautics and Space Administration (NASA).
The study, led by atmospheric researcher Roisin Commane at Harvard University, reveals that warmer temperatures and melting ice can cause carbon dioxide emissions to increase in the tundra , which will undoubtedly worsen global warming, as soils above 60 degrees north latitude have large amounts of carbon in the form of organic matter from dead vegetation.
Commane explained that during the Arctic summer, thawing soil and the decomposition of organic matter by microbes produce large amounts of CO2 . Although the ground refreezes in October, the high emissions of this compound continue until the ground freezes completely. To learn more about the impact of thawing on the Arctic tundra, you can read more about the melting of the Antarctic Ocean and its influence on cloud formation.
As a result, the climate is warming, causing the tundra to take up to three months to refreeze , whereas it used to take only a month. Furthermore, data from observation towers show steady increases in carbon dioxide, leading to milder temperatures in autumn and winter. This phenomenon, linked to global warming, is also impacting Arctic ice in winter.
Thus, tundra soils act as an amplifier of climate change, as mentioned in studies on the impact of melting ice on the Arctic tundra.
You can read the study here (in English).
Additional threats to the tundra
Climate change isn't the only challenge facing the tundra. Multiple factors threaten its ecosystem, each contributing uniquely to its destabilization.
Atmospheric pollution
Air pollution affects tundra environments in various ways. According to a 2018 study, Arctic clouds are particularly sensitive to air pollution, which stimulates cloud formation and has a blanketing effect. Black carbon from diesel engines, fires, and other combustion sources can be deposited on snow, reducing its ability to reflect sunlight and causing it to melt more quickly. This temperature increase due to pollution may also be related to studies on Kelvin waves and their effect on Antarctic ice melt.
Industrial activity
The oil, gas, and mining industries can disrupt the fragile habitats of the tundra. Drilling wells can thaw permafrost, while heavy vehicles and pipeline construction can damage the soil and prevent vegetation from returning. This activity also increases the risk of toxic spills, and it is important to note that thawing permafrost in the Arctic releases methane . Seismic testing for oil and gas exploration in the 80s left marks on the tundra that remain visible decades later.
Invasive and migratory species
Climate change is reducing the populations of some native Arctic tundra species, such as caribou (or reindeer), by promoting the increase in parasites and diseases and damaging food sources. But other species, such as shrubs and wolf spiders, are thriving.
The red fox, usually found further south, is moving north into the tundra and competing with the Arctic fox for food and territory. Although few invasive species have yet taken root in the Arctic, climate change increases the risk of this happening. And human activity, both near and far, can shift the balance: as snow geese have learned to forage on farmland rather than in the wild on their migratory routes, their exploding numbers have threatened to degrade their tundra nesting sites.
The impact of thawing permafrost
Permafrost, a layer of soil that has remained frozen for at least two years, is found across large parts of Alaska, Canada, and Siberia, where people, mostly Indigenous communities, have lived, worked, and hunted for hundreds of years. As global temperatures rise, the permafrost is thawing rapidly, releasing carbon and other greenhouse gases into the atmosphere, exacerbating global warming. To better understand the implications of Arctic warming for the global climate , it is crucial to consider these changes.
Effects on infrastructure and daily life
Melting permafrost has serious consequences for the communities that depend on it. Infrastructure such as roads, homes, and pipelines are threatened, as the once stable ground becomes unstable. This can lead to the displacement of entire communities, which may be forced to relocate.
A recent study indicated that Alaska Native communities like Tuktoyaktuk are experiencing these changes firsthand, with the land sinking and eroding, endangering their homes. Dr. Susan Natali, a scientist at the Woodwell Climate Research Center, notes that even access to clean water is becoming more difficult as rivers and lakes no longer reliably freeze during the winter.
The release of microorganisms and their impact
As permafrost thaws, previously dormant microorganisms are also being released. This poses unexpected biological risks, including the release of viruses and bacteria that could impact human and animal health.
The emergence of ancient pathogens could have unpredictable effects on public health. Some of these microorganisms have been inactivated for millennia and could now reappear in a changing environment. The concern lies in the potential release of diseases that could affect local populations and beyond.
Change in the carbon and nitrogen cycles
The permafrost situation also affects the carbon and nitrogen cycle in these polar regions. Melting permafrost plays an important role in the release of greenhouse gases, such as CO2 and methane, which come from the decomposition of organic matter.
In the Northern Hemisphere, it is estimated that approximately 1,7 trillion tons of carbon are stored in permafrost. As it thaws, this carbon is released, contributing to global warming in a feedback loop that amplifies the situation. To better understand the consequences of Arctic permafrost melt , it is important to continue researching these cycles.
The phenomenon of Arctic warming
The Arctic is warming at a staggering rate, faster than any other region on the planet. Recent research has shown that the Arctic is warming up to four times faster than the global average, meaning winter temperatures are significantly warmer. This warming is driven by both increased greenhouse gas emissions and changes in ice and snow cover, which affect the reflectivity of the Earth's surface (albedo).
This phenomenon not only affects the local climate but also has global implications. Melting sea ice, for example, contributes to rising sea levels and changes in ocean current patterns and atmospheric circulation.
Solutions and future actions
To safeguard tundra habitats and combat global warming, it is essential to reduce harmful pollution that heats up the planet by phasing out fossil fuels. Other measures include creating refuges and protecting certain species and regions, as well as limiting or banning industrial activity.
The Arctic Council, as an intergovernmental forum of Arctic countries, has created a working group to study and prevent the spread of invasive species in the region. Furthermore, it is essential to implement adaptation strategies that help local communities face the challenges of climate change, which is analyzed in studies on plant adaptation to climate change.
The participation of local communities is key to designing solutions, as they possess traditional and practical knowledge about the sustainable management of their environments. This collaboration can facilitate the creation of effective strategies for tundra conservation and mitigating the effects of climate change.
