Climate change may make Siberia habitable for humans: Study

Large parts of Asian Russia could become habitable by the late 21st century due to climate change, new research has found. Researchers from the Krasnoyarsk Federal Research Center, Russia, and the National Institute of Aerospace, US, used current and predicted climate scenarios to examine the climate comfort of Asian Russia and work out the potential for human settlement throughout the 21st century.

At 13 million square kilometres, Asian Russia - east of the Urals towards the Pacific - accounts for 77 per cent of Russia's land area, according to the study published in the journal Environmental Research Letters. Its population, however, accounts for just 27 per cent of the country's people and is concentrated along the forest-steppe in the south, with its comfortable climate and fertile soil.

"Previous human migrations have been associated with climate change. As civilisations developed technology that enabled them to adapt, humans became less reliant on the environment, particularly in terms of climate," said Elena Parfenova, from the Krasnoyarsk Federal Research Center. "We wanted to learn if future changes in climate may lead to the less-hospitable parts of Asian Russia becoming more habitable for humans," Parfenova said.

For their analysis, the team used a combination of 20 general circulation models (Coupled Model Intercomparison Project Phase 5) and two CO2 Representative Concentration Pathway scenarios -- RCP 2.6 representing mild climate change and RCP 8.5 representing more extreme changes. They applied the collective means of January and July temperatures and annual precipitation of the two scenarios to Asian Russia to find their respective effects on three climate indices that are important for human livelihood and well-being: Ecological Landscape Potential (ELP), winter severity, and permafrost coverage.

"We found increases in temperature of 3.4 degrees Celsius (RCP 2.6) to 9.1 degrees Celsius in mid-winter; increases of 1.9 degrees Celsius to 5.7 degrees Celsius (RCP 8.5) in mid-summer; and increases in precipitation of 60 mm to 140 mm," Parfenova said. "Our simulations showed that under RCP8.5, by the 2080s Asian Russia would have a milder climate, with less permafrost coverage, decreasing from the contemporary 65 per cent to 40 per cent of the area by the 2080s," she said.

The researchers also found that even under the RCP 2.6 scenario, the ELP for human sustainability would improve in more than 15 per cent of the area, which could allow for a five-fold increase in the capacity of the territory to sustain and become attractive to human populations. "Asian Russia is currently extremely cold. In a future warmer climate, food security in terms of crop distribution and production capability is likely to become more favourable for people to support settlements," Parfenova said.

"However, suitable land development depends on the authorities' social, political and economic policies. Lands with developed infrastructure and high agricultural potential would obviously be populated first. "Vast tracts of Siberia and the Far East have poorly developed infrastructure. The speed these developments happen depends on investments in infrastructure and agriculture, which in turn depends on the decisions that should be made soon," said Parfenova.

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