Siberia dries out as forests burn and climate heats

Siberia dries out as forests burn and climate heats

By Kieran Cooke

Residents of the small Arctic town of Khatanga have never experienced anything like it: their home is changing at a gallop as Siberia dries out.

Khatanga – population around 3,500 – is well north of the Arctic Circle, with usual daytime temperatures at this time of year hovering round a chilly 0°C. On 22 May the temperature in the town reached 25°C – more than double the record to date.

Global warming is causing profound change across the Arctic, a region which acts like a giant air conditioning system regulating the Earth’s climate.

Temperatures are rising far faster than elsewhere: sea ice cover is rapidly disappearing, valuable fish stocks are moving ever further north in search of colder waters, land around the Arctic perimeter is drying out – particularly across the vast expanse of Siberia.

Permafrost is melting. This week a giant oil tank collapsed and ruptured at a nickel and palladium works near the city of Norilsk in northern Siberia, spilling thousands of tonnes of diesel into the nearby Ambarnaya river.

Worst for years

The storage tank is believed to have been built on permafrost: a state of emergency has been declared for what is being described as one of the worst environmental disasters in recent Russian history. State media say an area stretching over 350 square kilometres is polluted and will take years to clean up.

A series of wildfires, often enveloping hundreds of thousands of hectares of Siberia’s boreal forests, or taiga, have raged in many areas over recent weeks.

In early spring farmers across Siberia often light fires to clear land of dead grass and unwanted vegetation. A combination of high temperatures and strong winds has led to fires blazing out of control. Last year Siberia’s fires are estimated to have destroyed an area of forest the size of Belgium.

“2019 saw a record number of fires over the summer months in Siberia”, says Thomas Smith, an environmental geographer at the London School of Economics (LSE) and a wildfires expert.

“This year, aided by high temperatures and conditions that have promoted growth, the fires started early, though so far their incidence is about average and not as extensive as in 2019.

“Forest fires in this region of the Arctic used to happen about every hundred years and now we’re seeing them every summer”

“But what’s important are the peak summer months: the soils are dry and there’s plenty of fuel, so conditions are favourable for more widespread fires”, Dr Smith told Climate News Network.

One of the regions worst affected is in the south of Siberia, around Lake Baikal, the world’s largest and deepest freshwater lake, where an estimated half a million hectares of forest were destroyed by fire earlier this year.

Evgeny Zinichev, Russia’s emergencies minister, speaks of a critical situation unfolding in Siberia and across Russia’s Far East. “The main reason, of course, is unauthorised and uncontrolled agricultural fires”, he says.

“A less snowy winter, an abnormal winter, and insufficient soil moisture are factors that create the conditions for the transition of landscape fires to settlements.”

Other factors have also led to the spread of wildfires. After weeks of lockdown due to the Covid-19 pandemic, people trapped in often cramped and stiflingly hot apartment blocks have sought freedom in the countryside and forests, camping and lighting barbecues.

Hungry Chinese demand

In Soviet times the taiga was more closely monitored and policed: that system has tended to break down in recent years. The Covid crisis has also drawn attention away from the fires.

Corruption and illegal logging, driven in large part by China’s demand for forest products, is an additional threat to the taiga.

The warming and wildfires are having an impact not only across Siberia but around the world. Its forests act as an enormous carbon sink, storing millions of tonnes of climate-changing greenhouse gases.

Fires and logging release the gases into the atmosphere, creating what scientists call a positive feedback loop – the more gases that are released, the warmer and drier the air becomes, so that more areas of forest are at risk from fire.

“Substantial areas of forest in Siberia are on peat soils”, says Dr Smith. “When these soils dry out, fires go underground, threatening to release large amounts of carbon which can lead to a catastrophic climate event.”

Wide impact

Smoke from the fires is carried by winds to other parts of the globe, trapping warm air near the Earth’s surface. The warm air generated by the fires is also likely to result in a further depletion in ice cover and warming of the Arctic seas.

The temperature rises and the growing incidence of wildfires in Siberia have other effects too.

A recent study published in the journal Scientific Reports says the fires mean that more nutrients, particularly nitrogen, leak into streams and waterways.

“Forest fires in this region of the Arctic used to happen about every hundred years and now we’re seeing them every summer”, says Bianca Rodriguez-Cardona, of the University of New Hampshire, Durham, US, one of the study’s authors.

“This increase in fires leads to more input of inorganic solutes into local streams which can alter the chemistry and trigger issues like increased algal blooms and bacteria that can be harmful to humans who depend on these waterways for drinking water, fishing and their livelihoods.” When these waters reach the Arctic they can also dramatically alter the chemistry of the surrounding seas, says the study. – Climate News Network


This article was originally posted on the Climate News Network.
Cover photo: The Siberian taiga blazes as petroleum gas burns off in a flare. Image: By Copper Kettle, via Wikimedia Commons

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